2019

Benjamin E. Partridge, Li Wang, Dipankar Sahoo, James T. Olsen, Pawaret Leowanawat, Célile Roche, Henrique Ferreira, Kevin J. Reilly, Xiangbing Zeng, Goran Ungar, Paul A. Heiney, Robert Graf, Hans W. Spiess, and Virgil Percec,"Sequence-defined dendrons dictate supramolecular cogwheel assembly of dendronized perylene bisimides", Journal of the American Chemical Society 2019, 141, p.15761 - 15766. (Download).

Brigitte A.G. Lamers, Robert Graf, Bas F.M. de Waal, Ghislaine Vantomme, Anja R.A. Palmans, and E.W. Meijer,"Polymorphism in the Assembly of Phase-Segregated Block Molecules: Pathway Control to 1D and 2D Nanostructures", Journal of the American Chemical Society 2019, 141, p.15456 - 15463. (Download).

Saleem Anwar, Daniel Pinkal, Wojciech Zajaczkowski, Philipp von Tiedemann, Hamed Sharifi Dehsari, Manasvi Kumar, Thomas Lenz, Ulrike Kemmer-Jonas, Wojciech Pisula, Manfred Wagner, Robert Graf, Holger Frey, and Kamal Asadi,"Solution-processed transparent ferroelectric nylon thin films", Science Advances 2019, 5. (Download).

Jiachen Wang, Xi Zhang, Robert Graf, Yi Li, Guang Yang, Xiaobin Fu, Jiaqi Ma, and Yefeng Yao,"A Small Lattice Change Induces Significant Dynamic Changes of CH3NH3+ Caged in Hybrid Perovskite Crystals: Toward Understanding the Interplay between Host Lattices and Guest Molecules", Inorganic Chemistry 2019, 58, p. 7426 - 7432. (Download).

 2018

G. Papamokos, J. Wudarczyk, R. Graf, D. Schollmeyer, M. Baumgarten, K. Müllen and G. Floudas,"Dipolar Relaxation in Functionalized Poly-p-phenylenes Bearing Ultrastrong Dipoles Perpendicular to the Backbone", Macromolecules 2018, 51, p. 3330 - 3339. (Download).

 2017

C.R. Arza, P. Froimowicz, L. Han, R. Graf, and H. Ishida, "Design, Synthesis, Characterization, and Polymerization of Fused-Ring Naphthoxazine Resins", Macromolecules 2017, 50, p9249 - 9256. (Download).

S. Alexandris, A. Franczyk, G. Papamokos, B. Marciniec, R. Graf, K. Matyjaszewski, K. Koynov and G. Floudas, "Dynamic Heterogeneity in Random Copolymers of Polymethacrylates Bearing Different Polyhedral Oligomeric Silsesquioxane Moieties (POSS)", Macromolecules 2017, 50, p. 4044 - 4054. (Download).

M.A. Hood, N. Encinas, D. Vollmer, R. Graf, K. Landfester, and R. Munoz-Espi,"Controlling hydrophobicity of silica nanocapsules prepared from organosilanes", Colloids and Surfaces A: Physicochemical and Engineering Aspects 2017, 532, p.172 - 177. (Download).

K. Yuan, T. Hu, Y. Z. Xu, R. Graf, L. Shi, M. Forster, T. Pichler, T. Riedl, Y. W. Chen, and U. Scherf,"Nitrogen-doped porous carbon/graphene nanosheets derived from two-dimensional conjugated microporous polymer sandwiches with promising capacitive performance", Materials Chemistry Frontiers 2017, 1, p.278 - 285. (Download).

R. Zhang, T. Xiao, R. Graf, E. De-Boer, R. Verhoef, A. Kentgens, G. Yang, S. Rastogi, and Y. F. Yao, "Chain packing in the noncrystalline region of deuterated UHMWPE: A solid-state H-2 and C-13 NMR study" European Polymer Journal 2017, 96, p.494 - 504.(Download).

Yang Yao, P. Ruckdeschel, R. Graf, H.J. Butt, M. Retsch, and G Floudas, "Homogeneous Nucleation of Ice Confined in Hollow Silica Spheres", J. Phys. Chem. B 2017, 121, p.306-313 (Download).

S. Rutkowski, A. Zych, M. Przybysz, M. Bouyahyi, P. Sowinski, R. Koevoets, J. Haponiuk, R. Graf, M.R. Hansen, L. Jasinska-Walc and R. Duchateau, "Toward Polyethylene-Polyester Block and Graft Copolymers with Tunable Polarity", Macromolecules 2017, 50, p.107 - 122 (Download).

D. Sahoo, M. Peterca, E. Aqad, B.E. Partridge, P.A. Heiney, R. Graf, H.W. Spiess, X.B. Zeng and V. Percec, "Tetrahedral Arrangements of Perylene Bisimide Columns via Supramolecular Orientational Memory", ACS Nano 2017, 11, p. 983-991 (Download).

 2016

Wei He, R. Graf, S. Vieth, U. Ziener, K. Landfester and D. Crespy, "The Cushion Method: A New Technique for the Recovery of Hydrophilic Nanocarriers", Langmuir 2016, 32, p. 13669-13674 (Download).

Ming-Shou Ho, B.E. Partridge, Hao-Jan Sun, D. Sahoo, P. Leowanawat, M. Peterca, R. Graf, H.W. Spiess, Xiangbing Zeng, G. Ungar, P.A. Heiney, Chain-Shu Hsu and V. Percec, "Screening Libraries of Semifluorinated Arylene Bisimides to Discover and Predict Thermodynamically Controlled Helical Crystallization", ACS Combinatorial Science 2016, 12, p. 723-739 (Download).

D. Sahoo, M. Peterca, E. Aqad, B.E. Partridge, P.A. Heiney, R. Graf, H.W. Spiess, X.B. Zeng and V. Percec, "Tetrahedral Arrangements of Perylene Bisimide Columns via Supramolecular Orientational Memory", J. Am. Chem. Soc. 2016, 138, p. 14798-14807 (Download).

W.X. Zhao, F. Zhang, L.Y. Yang, S. Bi, D.Q. Wu, Y.F. Yao, M. Wagner, R. Graf, M.R. Hansen, X.D. Zhuang and X.L. Feng. "Anionic porous polymers with tunable structures and catalytic properties.", J. Mater. Chem. A 2016, 4, p. 15162-15168 (Download).

K. Yuan, T. Hu, Y.Z. Xu, R. Graf, G. Brunklaus, M. Forster, Y.W. Chen and U. Scherf. "Engineering the Morphology of Carbon Materials: 2D Porous Carbon Nanosheets for High-Performance Supercapacitors.", ChemElectroChem 2016, 3, p.822-828 (Download).

I.S. Jung, Y.J. Lee, D. Jeong, R. Graf, T.L. Choi, W.J. Son, X. Bulliard and H.W. Spiess, "Conformational Analysis of Oxygen-Induced Higher Ordered Structure of A, B-Alternating Poly(arylene vinylene) Copolymers by Solid-State NMR and Molecular Dynamics Simulations.", Macromolecules 2016, 49, p.3061-3069 (Download).

Y.S. Deshmukh, C. Wilsens, R. Verhoef, M.R. Hansen, D. Dudenko, R. Graf, E.A. Klop and S. Rastogi, "Conformational and Structural Changes with Increasing Methylene Segment Length in Aromatic-Aliphatic Polyamides.", Macromolecules 2016, 49, p.950-962 (Download).

L.C. da Silva, C.R. Bowers, R. Graf and K.B. Wagener, "Molecular Motion of the Junction Points in Model Networks Prepared by Acyclic Triene Metathesis.", Macrom. Rapid Comm. 2016, 37, p.527-531 (Download).

M.R. Hansen, R. Graf and H. W. Spiess,"Interplay of Structure and Dynamics in Functional Macromolecular and Supramolecular Systems As Revealed by Magnetic Resonance Spectroscopy.", Chemical Reviews 2016, 116, p.1272-1308 (Download).

C. Roche, H.-J. Sun, P. Leowanawat, F. Araoka, B.E. Partridge, M. Peterca, D.A. Wilson, M.E. Prendergast, P.A. Heiney, R. Graf, H.W. Spiess, X. Zeng, G. Ungar, and V. Percec,"A Supramolecular Helix That Disregards Chirality", Nat. Chem. 2016, 8, p.80-89 (Download).

 2015

L. Caire da Silva, R. Graf, C. R. Bowers and K. B. Wagener, "Branch-Induced Heterogeneous Chain Motion in Precision Polyolefins." Macromolecules 2015, 48, p. 8858-8866.(Download).

Y. Suzuki, M. Steinhart, R. Graf, H.-J. Butt, and G. Floudas, "Dynamics of Ice/Water Confined in Nanoporous Alumina". The Journal of Physical Chemistry B, 2015, 119, 14814-14820 (Download).

C.N. Tironi, R. Graf, I. Lieberwirth, M. Klapper, and K. Mullen,"Synthesis and Selective Loading of Polyhydroxyethyl Methacrylate-/-Polysulfone Amphiphilic Polymer Conetworks", ACS Macro Letters 2015, 4, p. 1302-1306 (Download).

M. Pfeffermann, R. Dong, R. Graf, W. Zajaczkowski, T. Gorelik, W. Pisula, A. Narita, K. Müllen, and X. Feng,"Free-Standing Monolayer Two-Dimensional Supramolecular Organic Framework with Good Internal Order", J. Am. Chem. Soc. 2015, 137, 14525-14532 (Download).

S.B. Baek, D. Moon, R. Graf, W.J. Cho, S.W. Park, T.-U. Yoon, S.J. Cho, I.-C. Hwang, Y.-S. Bae, H.W. Spiess, H.C. Lee, and K.S. Kim , "High-Temperature in Situ Crystallographic Observation of Reversible Gas Sorption in Impermeable Organic Cages". Polymer Proc. Natl. Acad. Sci. U.S.A., 2015, 112, 14156-14161 (Download).

N.F. Sauty, L.C. da Silva, C. Gallagher, R. Graf, and K.B. Wagener, "Unveiling the Hyperbolic Thermal Behaviour of Poly(p-Phenylene Alkylene)s". Polymer Chemistry, 2015, 6, 6073-6082 (Download).

P. M. Ma, Y. S. Deshmukh, C. Wilsens, M. R. Hansen, R. Graf, S. Rastogi, "Self-Assembling Process of Oxalamide Compounds and Their Nucleation Efficiency in Bio-Degradable Poly(Hydroxyalkanoate)s", Scientific Reports 2015, 5 (Download).

Wei He, M. Parowatkin, V. Mailänder, M. Flechtner-Mors, R. Graf, A. Best, K. Koynov, K. Mohr, U. Ziener, K. Landfester, D. Crespy, "Nanocarrier for Oral Peptide Delivery Produced by Polyelectrolyte Complexation in Nanoconfinement", Biomacromolecules 2015, 16, 2282-2287(Download).

B.E. Partridge, P. Leowanawat, E. Aqad, M.R. Imam, H.-J. Sun, M. Peterca, P.A. Heiney, R. Graf, H.W. Spiess, X. Zeng, G. Ungar, V. Percec,"Increasing 3D Supramolecular Order by Decreasing Molecular Order. A Comparative Study of Helical Assemblies of Dendronized Nonchlorinated and Tetrachlorinated Perylene Bisimides", J. Am. Chem. Soc. 2015, 137, 5210-5224 (Download).

T. Schuster, F.E. Golling, J.W. Krumpfer, M. Wagner, R. Graf, A.A. Alsaygh, M. Klapper, K. Müllen, "Poly(isobutylene) Nanoparticles via Cationic Polymerization in Nonaqueous Emulsions", Macrom. Rapid Comm. 2015, 36, 204-210 (Download).

Y.-C. Wu, P. Leowanawat, H.-J. Sun, B.E. Partridge, M. Peterca, R. Graf, H.W. Spiess, X. Zeng, G. Ungar, C.-S. Hsu, P.A. Heiney, V. Percec,"Complex Columnar Hexagonal Polymorphism in Supramolecular Assemblies of a Semifluorinated Electron-Accepting Naphthalene Bisimide", J. Am. Chem. Soc. 2015,137, 807-819 (Download).

L. Jasinska-Walc, M. Bouyahyi, A. Rozanski, R. Graf, M.R. Hansen, R. Duchateau,, "Synthetic Principles Determining Local Organization of Copolyesters Prepared from Lactones and Macrolactones", Macromolecules 2015, 48, 502-510 (Download).

A. Fernández, M.T. Expósito, B. Peña, R. Berger, J. Shu, R. Graf, H.W. Spiess, R.A. García-Muñoz, "Molecular structure and local dynamic in impact polypropylene copolymers studied by preparative TREF, solid state NMR spectroscopy, and SFM microscopy", Polymer 2015, 61, 87-98 (Download).

 2014

K. Wunderlich, C. Grigoriadis, G. Zardalidis, M. Klapper, R. Graf, H.-J. Butt, G. Floudas, " Poly(ethylene glycol)-Functionalized Hexaphenylbenzenes as Unique Amphiphiles: Supramolecular Organization and Ion Conductivity", Macromolecules 2014, 46, 5691-5702 (Download).

Z.-S. Wu, L. Chen, J. Liu, K. Parvez, H. Liang, J. Shu, H. Sachdev, R. Graf, X. Feng, K. Müllen, "High-Performance Electrocatalysts for Oxygen Reduction Derived from Cobalt Porphyrin-Based Conjugated Mesoporous Polymers", Advanced Materials 2014, 26, 1450-1455 (Download).

C. Roche, H.-J. Sun, M.E. Prendergast, P. Leowanawat, B.E. Partridge, P.A. Heiney, F. Araoka, R. Graf, H.W. Spiess, X. Zeng, G. Ungar, and V. Percec,"Homochiral Columns Constructed by Chiral Self-Sorting During Supramolecular Helical Organization of Hat-Shaped Molecules",J. Am. Chem. Soc. 2014,136, 7169-7185 (Download).

J. Wegener, A. Kaltbeitzel, R. Graf, M. Klapper, K. Müllen,"Proton Conductivity in Doped Aluminum Phosphonate Sponges",Chemsuschem 2014, 7, 1148-1154 (Download).

Khaled Parvez, Zhong-Shuai Wu, Rongjin Li, Xianjie Liu, Robert Graf, Xinliang Feng, and Klaus Müllen,"Exfoliation of Graphite into Graphene in Aqueous Solutions of Inorganic Salts",J. Am. Chem. Soc. 2014, 136, 6083-6091 (Download).

R. Graf, M.R. Hansen, D. Hinderberger, K. Muennemann and H.W. Spiess,"Advanced Magnetic Resonance Strategies for the Elucidation of Nanostructured Soft Matter",Phys. Chem. Chem. Phys. 2014, 16, 9700-9712 (Download).

M. Hajir, R. Graf, W. Tremel,"Stable amorphous calcium oxalate: synthesis and potential intermediate in biomineralization",Chemical Communications 2014, 50, 6534-6536 (Download).

K.K. Oehlenschlaeger, J.O. Mueller, J. Brandt, S. Hilf, A. Lederer, M. Wilhelm, R. Graf, M.L. Coote, F.G. Schmidt and C. Barner-Kowollik, "Adaptable Hetero Diels-Alder Networks for Fast Self-Healing under Mild Conditions", Advanced Materials 2014, 26, 3561-3566 (Download).

L. Jasinska-Walc, M.R. Hansen, D. Dudenko, A. Rozanski, M. Bouyahyi, M. Wagner, R. Graf and R. Duchateau, "Topological Behavior Mimicking Ethylene-Hexene Copolymers Using Branched Lactones and Macrolactones", Polymer Chemistry 2014, 5, 3306-3310 (Download).

 2013

M. R. Hansen, R. Graf and H. W. Spiess, "Solid-State NMR in Macromolecular Systems: Insights on How Molecular Entities Move", Accounts of Chemical Research 2013, 46, 1996-2007(Download).

Y. S. Deshmukh, R. Graf, M.R. Hansen and S. Rastogi, "Dissolution and Crystallization of Polyamides in Superheated Water and Concentrated Ionic Solutions", Macromolecules 2013, 46, 7086-7096(Download).

W. Zhang, H.Y. Ye, R. Graf, H.W. Spiess, Y.F. Yao, R.Q. Zhu, R.G. Xiong, "Tunable and Switchable Dielectric Constant in an Amphidynamic Crystal", J. Am. Chem. Soc. 2013, 135, 5230-5233 (Download).

V. Percec, H.J. Sun, P. Leowanawat, M. Peterca, R. Graf, H.W. Spiess, X.B. Zeng, G. Ungar, P.A. Heiney, "Transformation from Kinetically into Thermodynamically Controlled Self-Organization of Complex Helical Columns with 3D Periodicity Assembled from Dendronized Perylene Bisimides", J. Am. Chem. Soc. 2013, 135, 4129-4148 (Download).

Y.F. Yao, S. Rastogi, H.J. Xue, Q. Chen, R. Graf, R. Verhoef, "Segmental mobility in the noncrystalline regions of nascent polyethylene synthesized using two different catalytic systems with implications on solid-state deformation." Polymer 2013 , 54, 411-422 (Download).

A. Mpoukouvalas, W.W. Li, R. Graf, K. Koynov, K. Matyjaszewski, "Soft Elastomers via Introduction of Poly(butyl acrylate) "Diluent" to Poly(hydroxyethyl acrylate)-Based Gel Networks", Acs Macro. Letters 2013, 2, 23-26.(Download).

C. Friedrichs, S. Emmerling, G. Kircher, R. Graf, H.W. Spiess, "Glass transition of poly(ethylmethacrylate) admixed and bound to nanoparticles", J. Chem. Phys. 2013, 138 (Download).

 2012

R. Graf, H.W. Spiess, G. Floudas, H.J. Butt, M. Gkikas, H. Iatrou, "Conformational Transitions of Poly(L-proline) in Copolypeptides with Poly(gamma-benzyl-L-glutamate) Induced by Packing." Macromolecules 2012, 45, 9326-9332 (Download).

B. Inci, I. Lieberwirth, W. Steffen, M. Mezger, R. Graf, K. Landfester, K.B. Wagener, "Decreasing the Alkyl Branch Frequency in Precision Polyethylene: Effect of Alkyl Branch Size on Nanoscale Morphology", Macromolecules 2012, 45, 3367-3376 (Download).

J.A.W. Harings, Y.S. Deshmukh, M.R. Hansen, R. Graf, S. Rastogi, "Processing of Polyamides in the Presence of Water via Hydrophobic Hydration and Ionic Interactions", Macromolecules 2012, 45, 5789-5797 (Download).

R. Graf, H.W. Spiess, G. Floudas, H.J. Butt, M. Gkikas, H. Iatrou, "Conformational Transitions of Poly(L-proline) in Copolypeptides with Poly(gamma-benzyl-L-glutamate) Induced by Packing", Macromolecules 2012, 45, 9326-9332 (Download).

J. Fickert, P. Rupper, R. Graf, K. Landfester, D. Crespy, "Design and characterization of functionalized silica nanocontainers for self-healing materials", J. Mater. Chem. 2012, 22, 2286-2291 (Download).

J. Chen, J. Shu, S. Schobloch, A. Kroeger, R. Graf, R. Munoz-Espi, K. Landfester, U.A. Ziener, "A New Design Strategy for the Synthesis of Unsubstituted Polythiophene with Defined High Molecular Weight", Macromolecules 2012, 45, 5108-5113 (Download).

T. Agag, J. Liu, R. Graf, H.W. Spiess, H. Ishida, "Benzoxazole Resin: A Novel Class of Thermoset Polymer via Smart Benzoxazine Resin", Macromolecules 2012, 45, 8991-8997 (Download).

 2011

R. Graf, "New proton conducting materials for technical applications: What can we learn from solid state NMR studies?", Solid State Nucl. Magn. Reson. 40, 127-133 (2011) (Download).

V. Percec, S.D. Hudson, M. Peterca, P. Leowanawat, E. Aqad, R. Graf, H.W. Spiess, X. Zeng, G. Ungar, P.A. Heiney, "Self-Repairing Complex Helical Columns Generated via Kinetically Controlled Self-Assembly of Dendronized Perylene Bisimides", J. Am. Chem. Soc. 133, p. 18479-18494 (2011) (Download).

M. Wegner, D. Dudenko, D. Sebastiani, A.R.A. Palmans, T.F.A. de Greef, R. Graf, H.W. Spiess, "The impact of the amide connectivity on the assembly and dynamics of benzene-1,3,5-tricarboxamides in the solid state", Chemical Science 2, p. 2040-2049 (2011) (Download).

K. Saalwaechter, F. Lange, K. Matyjaszewski, C.-F. Huang, R. Graf, "BaBa-xy16: Robust and broadband homonuclear DQ recoupling for applications in rigid and soft solids up to the highest MAS frequencies", J. Magn. Reson. 212, p. 204-215 (2011) (Download).

L. Ragupathy, U. Ziener, R. Graf, K. Landfester, "Grafting polyacrylates on natural rubber latex by miniemulsion polymerization", Colloid and Polymer Science 289, p. 1783-1783 (2011) (Download).

V. Percec, M. Peterca, T. Tadjiev, X. Zeng, G. Ungar, P. Leowanawat, E. Aqad, M.R. Imam, B.M. Rosen, U. Akbey, R. Graf, S. Sekharan, D. Sebastiani, H.W. Spiess, P.A. Heiney, S.D. Hudson, "Self-Assembly of Dendronized Perylene Bisimides into Complex Helical Columns", J. Am. Chem. Soc. 133, p. 12197-12219 (2011) (Download).

M. Maier, N. Kotman, C. Friedrichs, J. Andrieu, M. Wagner, R. Graf, W.S.L. Strauss, V. Mailaender, C.K. Weiss, K. Landfester, "Highly Site Specific, Protease Cleavable, Hydrophobic Peptide-Polymer Nanoparticles", Macromolecules 44, p. 6258-6267 (2011) (Download).

A.R. Albunia, R. Graf, "The Effect of Inclusion of Dichloromethane in the δ-Clathrate Phase of Syndiotactic Polystyrene", Soft Materials 9, p. 183-198 (2011) (Download).

Y. Garro Linck, A.K. Chattah, R. Graf, C.B. Romanuk, M.E. Olivera, R.H. Manzo, G.A. Monti, H.W. Spiess, "Multinuclear solid state NMR investigation of two polymorphic forms of Ciprofloxacin-saccharinate", Physical Chemistry Chemical Physics 13, p. 6590-6596 (2011) (Download).

C. Gartner, B. Lucy Lopez, L. Sierra, R. Graf, H.W. Spiess, M. Gaborieau, "Interplay between Structure and Dynamics in Chitosan Films Investigated with Solid-State NMR, Dynamic Mechanical Analysis, and X-ray Diffraction", Biomacromolecules 12, p. 1380-1386 (2011) (Download).

H.N. Tsao, D.M. Cho, I. Park, M.R. Hansen, A. Mavrinskiy, D.Y. Yoon, R. Graf, W. Pisula, H.W. Spiess, K. Muellen,"Ultrahigh Mobility in Polymer Field-Effect Transistors by Design", J. Am. Chem. Soc. 133, p. 2605-2612 (2011) (Download).

 2010

C. Scherer, S. Utech, S. Scholz, S. Noskov, P. Kindervater, R. Graf, A.F. Thuenemann, M. Maskos, "Synthesis, characterization and fine-tuning of bimodal poly(organosiloxane) nanoparticles", Polymer 51, p. 5432-5439 (2010) (Download)

Lijuan Zhang, Maria D'Acunzi, Michael Kappl, Arnout Imhof, Alfons van Blaaderen, Hans-Juergen Butt, Robert Graf, Doris Vollmer, "Tuning the mechanical properties of silica microcapsules", Physical Chemistry Chemical Physics 12, p. 15392-15398 (2010) (Download)

Haijin Zhu, Robert Graf, Guangjin Hou, Ying Zhao, Dujin Wang, Hans Wolfgang Spiess, "Solid-State NMR Characterization of the Multiphase Structure of Polypropylene In-reactor Alloy", Macromol. Chem. Phys. 211, p. (2010) (Download)

Marianne Gaborieau, Leena Nebhani, Robert Graf, Leonie Barner and Christopher Barner-Kowollik, "Accessing Quantitative Degrees of Functionalization on Solid Substrates via Solid-State NMR Spectroscopy", Macromolecules 43, p. 3868-3875 (2010) (Download)

Fengjing Jiang, Haijin Zhu, Robert Graf, Wolfgang H. Meyer, Hans W. Spiess and Gerhard Wegner, "Phase Behavior and Proton Conduction in Poly(vinylphosphonic acid)/Poly(ethylene oxide) Blends", Macromolecules 43, p. 3876-3881(2010) (Download)

 2009

A.R. Albunia, R. Graf, A. Grassi, G. Guerra, H.W. Spiess, "Geometry of Complex Molecular Motions of Guest Molecules in Polymers from Solid State 2H NMR", Macromolecules 42, p. 4929-4931 (2009) (Download)

ü. Akbey, S. Granados-Focil, E.B. Coughlin, R. Graf, H.W. Spiess, "1H Solid-State NMR Investigation of Structure and Dynamics of Anhydrous Proton Conducting Triazole-Functionalized Siloxane Polymers", J. Phys. Chem. B 113, p. 9151-9160 (2009) (Download)

Y. Yao, R. Graf, H.W. Spiess, S. Rastogi, "Influence of Crystal Thickness and Topological Constraints on Chain Diffusion in Linear Polyethylene", Macrom. Rapid Comm. 30, p. 1123-1127 (2009) (Download)

J.A.W. Harings, Y. Yao, R. Graf, O. van Asselen, R. Broos, S. Rastogi, "Erasing Conformational Limitations in N,N'-1,4-Butanediyl-bis(6-hydroxy-hexanamide) Crystallization from the Superheated State of Water", Langmuir 25, p. 7652-7666 (2009) (Download)

C.G. Clark Jr., G.A. Floudas, Y.J. Lee, R. Graf, H.W. Spiess, K. Müllen, "Molecularly Tethered Amphiphiles as 3-D Supramolecular Assembly Platforms: Unlocking a Trapped Conformation", J. Am. Chem. Soc. 131, p. 8537-8547 (2009) (Download)

M.R. Hansen, T. Schnitzler, W. Pisula, R. Graf, K. Müllen, H.W. Spiess, "Cooperative Molecular Motion within a Self-Assembled Liquid-Crystalline Molecular Wire: The Case of a TEG-Substituted Perylenediimide Disc", Angew. Chem. Int. Ed. 48, p. 4621 - 4624 (2009) (Download)

S. Rastogi, Y. Yao, D.R. Lippits, G.W.H. Höhne, R. Graf, H.W. Spiess, P.J. Lemstra, "Segmental Mobility in the Non-crystalline Regions of Semicrystalline Polymers and its Implications on Melting", Macrom. Rapid Comm. 30, p. 826 - 839 (2009) (Download)

P. Castignolles, R. Graf, M. Parkinson, M. Wilhelm, M. Gaborieau, "Detection and quantification of branching in polyacrylates by size-exclusion chromatography (SEC) and melt-state 13C NMR spectroscopy", Polymer 50, p. 2373 - 2383 (2009) (Download)

Y. Wei, R. Graf, J.C. Sworen, C.-Y. Cheng, C.R. Bowers, K.B. Wagener, H.W. Spiess, "Local and Collective Motions in Precise Polyolefins with Alkyl Branches: A Combination of ²H and ¹³C Solid-State NMR Spectroscopy", Angew. Chem. Int. Ed. 48, p. 4617 - 4620 (2009) (Download)

V. Percec, M.R. Imam, M. Peterca, D.A. Wilson, R. Graf, H.W. Spiess, V.S.K. Balagurusamy, P.A. Heiney, "Self-Assembly of Dendronized Triphenylenes into Helical Pyramidal Columns and Chiral Spheres", J. Am. Chem. Soc. 131, p. 7662 - 7677 (2009) (Download)

G. Zucchi, P. Viville, B. Donnio, A. Vlad, S. Melinte, M. Mondeshki, R. Graf, H.W. Spiess, Y.H. Geerts, R. Lazzaroni, "Miscibility between Differently Shaped Mesogens: Structural and Morphological Study of a Phthalocyanine-Perylene Binary System", J. Phys. Chem. B 113, p. 5448 - 5457 (2009) (Download)

M.R. Hansen, R. Graf, S. Sekharan, D. Sebastiani, "Columnar Packing Motifs of Functionalized Perylene Derivatives: Local Molecular Order Despite Long-Range Disorder", J. Am. Chem. Soc. 131, p. 5251 - 5256 (2009) (Download)

Y.J. Lee, C.G. Clark Jr., R. Graf, M. Wagner, K. Müllen, H.W. Spiess, "Solid-State Organization of Semifluorinated Alkanes Probed by 19F MAS NMR Spectroscopy", J. Phys. Chem. B 113, p. 1360 - 1366 (2009) (Download)

U. Akbey, R. Graf R, Y.G. Peng, P.P. Chu, H.W. Spiess, "Solid-State NMR Investigations of Anhydrous Proton-Conducting Acid-Base Poly(acrylic acid)-Poly(4-vinyl pyridine) Polymer Blend System: A Study of Hydrogen Bonding and Proton Conduction", J. Polymer Science B - Polymer Pysics 47, p. 138-155 (2009) (Download)

 2008

Marianne Gaborieau, Robert Graf, Hans Wolfgang Spiess, "Investigation of Chain Dynamics in Poly(n-alkyl methacrylate)s by Solid-State NMR: Comparison with Poly(n-alkyl acrylate)s", Macromol. Chem. Phys. 209, p. 2078 - 2086 (2008) (Download)

A. Sezgin, U. Akbey, M.R. Hansen, R. Graf R, A. Bozkurt, A. Baykal, "Synthesis and NMR studies of the polymer membranes based on poly(4-vinylbenzylboronic acid) and phosphoric acid", Polymer 49, p. 3859 - 3864 (2008) (Download)

S.U. Celik, U. Akbey, R. Graf R, A. Bozkurt, H.W. Spiess, "Anhydrous proton-conducting properties of triazole-phosphonic acid copolymers: a combined study with MAS NMR", Physical Chemistry Chemical Physica 10, p. 6058 - 6066 (2008) (Download)

J.A.W. Harings, O. van Asselen, R. Graf, R. Broos, S. Rastogi, "The role of superheated water on shielding and mediating hydrogen bonding in N,N '-1,2-ethanediyl-bis(6-hydroxy-hexanamide) crystallization", Crystal Growth & Design 8, p. 3323 - 3334 (2008) (Download)

W. Pisula, Z. Tomoviç, M. Wegner, R. Graf, M.J. Pouderoijen, E.W. Meijer, A.P. H. J. Schenning, "Liquid crystalline hydrogen bonded oligo(p-phenylenevinylene)s", J. Mater. Chem. 18, p. 2968 - 2977 (2008) (Download)

J.A.W. Harings, O. van Asselen, R. Graf, R. Broos, S. Rastogi, "The Role of Superheated Water on the Crystallization of N,N'-1,2-Ethanediyl-bis(6-hydroxy-hexanamide): Implications on Crystallography and Phase Transitions", Crystal Growth & Design 8, p. 2469 - 2477 (2008) (Download)

E. Vinken, A.E. Terry, O. van Asselen, A.B. Spoelstra, R. Graf, S. Rastogi, "Role of Superheated Water in the Dissolution and Perturbation of Hydrogen Bonding in the Crystalline Lattice of Polyamide 4,6", Langmuir 24, p. 6313-6326 (2008) (Download)

M. Lehmann, M. Jahr, B. Donnio, R. Graf, S. Gemming, I. Popov, "Star-shaped oligobenzoates: non-conventional mesogens forming columnar helical mesophases", Chem. Eur. J. 14, p. 3562-3576 (2008) (Download)

Y.-F. Yao, R. Graf, H.W. Spiess, S. Rastogi, "Restricted segmental mobility can facilitate medium-range chain diffusion: a NMR study of morphological influence on chain dynamics of polyethylene", Macromolecules 41, p. 2514-2519 (2008) (Download)

Sevim ünügür Çelik, ümit Akbey, Ayhan Bozkurt, Robert Graf, Hans W. Spiess, "Proton conducting properties of acid doped poly(glycidyl methacrylate)-1,2,4-triazole systems", Macromol. Chem. Phys. 209, p. 593-603 (2008) (Download)

 2007

Y.-F. Yao, R. Graf, H.W. Spiess, D.R. Lippits, and S. Rastogi, "Morphological differences in semicrystalline polymers: Implications for local dynamics and chain diffusion", Phys. Rev. E 76, 060801 (2007) (Download)

M. Kamperman, Phong Du, R.O. Scarlat, E. Herz, U. Werner-Zwanziger, R. Graf, J.W. Zwanziger, H.W. Spiess, U. Wiesner, "Composition and morphology control in ordered mesostructured high-temperature ceramics from block copolymer mesophases", Macromol. Chem. Phys. 208, p. 2096-2108 (2007) (Download)

Marianne Gaborieau, Robert Graf, Stefan Kahle, Tadeusz Pakula, Hans Wolfgang Spiess, "Chain dynamics in poly(n-alkyl acrylates) by solid-state NMR, dielectric, and mechanical spectroscopy", Macromolecules 40, p. 6249-6256 (2007) (Download)

Robert Graf, Bernd Ewen, Hans Wolfgang Spiess, "Geometry of phenylene motion in polycarbonate from NMR spectroscopy and neutron scattering", J. Chem. Phys. 126, 041104 (2007) (Download)

 2006

M. Mondeshki, G. Mihov, R. Graf, H.W. Spiess, K. Müllen, P. Papadopoulos, A. Gitsas, G. Floudas, "Self-assembly and molecular dynamics of peptide-functionalized polyphenylene dendrimers", Macromolecules 39, p. 9605-9613 (2006) (Download)

E. Somma, C. Chi, B. Loppinet, J. Grinshtein, R. Graf, G. Fytas, H.W. Spiess, G. Wegner, "Orientation dynamics in isotropic phases of model oligofluorenes: Glass or liquid crystal", J. Chem. Phys. 124, 204910 (2006) (Download)

T.Y. Cho, E.J. Shin, W. Jeong, B. Heck, R. Graf, G. Strobl, H.W. Spiess, D.Y. Yoon, "Effects of comonomers on lamellar and noncrystalline microstructure of ethylene copolymers", Macrom. Rapid Comm. 27, p. 322-327 (2006) (Download)

 2005

Marianne Gaborieau, Robert Graf, Hans Wolfgang Spiess, "Versatility of the dipolar filter selection: From H-1 nuclear spin diffusion experiment to the measurement of nuclear Overhauser effect in homopolymer melts", Solid State Nucl. Magn. Reson. 28, p. 160-172 (2005) (Download)

Sanjay Rastogi, Dirk R. Lippits, Gerrit W. M. Peters, Robert Graf, Yefeng Yao, Hans Wolfgang Spiess, "Heterogeneity in polymer melts from melting of polymer crystals", Nature Materials 4, p. 635-641 (2005). (Download)

Alexandra R. Albunia, Robert Graf, Gaetano Guerra, Hans Wolfgang Spiess, "²H NMR study of aromatic guest dynamics in clathrate phases of syndiotactic polystyrene", Macrom. Chem. Phys. 206, p. 715-724 (2005). (Download)

Michael Wind, Robert Graf, Sabine Renker, and Hans Wolfgang Spiess, "Structural Reasons for Restricted Backbone Motion in Poly(n-Alkylmethacrylates): Degree of Polymerization, Tacticity and Side-Chain Length", Macromol. Chem. Phys. 206, p. 142-156 (2005). (Download)

Michael Wind, Lothar Brombacher, Andreas Heuer, Robert Graf and Hans Wolfgang Spiess, "¹³C Solid State NMR Investigation of Structural Relaxation of the Polymer Backbone in Poly(ethylmethacrylate)", Solid State NMR 27, p. 132-139 (2005). (Download)

Michael Wind, Robert Graf, Sabine Renker, Hans Wolfgang Spiess, and Werner Steffen, "Structure of amorphous poly-(ethylmethacrylate): A wide-angle x-ray scattering study", J. Chem. Phys. 122, p. 014906, 1-10 (2005). (Download)

 2004

Niklas Hedin, Robert Graf, Sean C. Christiansen, Christel Gervais, Ryan C. Hayward, Juergen Eckert, and Bradley F. Chmelka, "Structure of a Surfactant-Templated Silicate Framework in the Absence of 3D Crystallinity", J. Am. Chem. Soc. 126, p. 9425-9432 (2004). (Download)

M. Pollard, K. Klimke, R. Graf, H. W. Spiess, M. Wilhelm O. Sperber, C. Piel, and W. Kaminsky, "Observation of chain branching in polyethylene in the solid-state and melt via ¹³C-NMR spectroscopy and melt NMR relaxation time measurements", Macromolecules 37, p. 813-825 (2004). (Download)

 2003

Michael Wind, Robert Graf, Andreas Heuer, and Hans Wolfgang Spiess, "Structural Relaxation of Polymers at the Glass Transition: Conformational Memory in Poly(n-alkylmethacrylates)", Phys. Rev. Lett. 91, p. 155702 (2003). (Download)

M. McCormick, R. Smith, R. Graf, C.J. Barrett, L. Reven, H.W. Spiess, "NMR Studies of the Effect of Adsorbed Water on Polyelectrolyte Multilayer Films in the Solid State", Macromolecules 36, p. 3616-3625 (2003). (Download)

I. Schiffer, W. G. Schreiber, R. Graf, E. M. Schreiber, D. Jung , D. M. Rose, M. Hehn, S. Gebhard, J. Sagemüller, H. W. Spiess, F. Oesch, M. Thelen, J. G. Hengstler, Bioelectromagnetics 24, p. 241-250 (2003). (Download)

S. Pawsey, M. McCormick, S. DePaul S, R. Graf, Y. S. Lee, L. Reven, H. W. Spiess, "¹H fast MAS NMR studies of hydrogen-bonding interactions in self-assembled monolayers", Am. Chem. Soc.125, p. 4174-4184 (2003). (Download)

 2002

M. Stumber, M. Geyer, R. Graf, H. R. Kalbitzer, K. Scheffzek, U. Haeberlen, "Observation of slow dynamic exchange processes in Ras protein crystals by ³¹P solid state NMR spectroscopy", J. Mol. Biology 323, p. 899-907 (2002). (Download)

 2001

M. Mierzwa, G. Floudas, M. Neidhofer, R. Graf, H. W. Spiess, W. H. Meyer, G. Wegner, "Constrained dynamics in supramolecular structures of poly(p-phenylenes) with ethylene oxide side chains: A combined dielectric and nuclear magnetic resonance investigation", J. Chem. Phys. 117, p. 6289-6299 (2001). (Download)

W. G. Schreiber, E. M. Teichmann, I. Schiffer, J. Hast, W. Akbari, H. Georgi, R. Graf, M. Hehn, H. W. Spiess, M. Thelen, F. Oesch, J. G. Hengstler, "Lack of mutagenic and co-mutagenic effects of magnetic fields during magnetic resonance Imaging", J. Magn. Reson. Imag. 14, p. 779-788 (2001). (Download)

S. S. Hou, R. Graf , H. W. Spiess, P. L. Kuo, "An investigation into PEO/crosslinked-silicone semi-interpenetrating polymer network using ¹H solid-state NMR spectroscopy under fast MAS", Macrom. Rapid Comm. 22, p. 1386-1389 (2001). (Download)

K. Saalwächter, R. Graf, H.W. Spiess, "Recoupled polarization-transfer methods for solid-state ¹H-¹³C heteronuclear correlation in the limit of fast MAS", J. Magn. Reson. 148, p. 398-418 (2001). (Download)

T. Dollase, R. Graf, A. Heuer, H.W. Spiess, "Local order and chain dynamics in molten polymer blocks revealed by proton double-quantum NMR", Macromolecules 34, p. 298-309 (2001). (Download)

 2000

S.M. De Paul, K. Saalwächter, R. Graf, H.W. Spiess, "Sideband patterns from rotor-encoded longitudinal magnetization in MAS recoupling experiments", J. Magn. Reson. 146, p. 140-156 (2000). (Download)

 1999

K. Saalwächter, R. Graf, H.W. Spiess, "Recoupled polarization transfer heteronuclear ¹H-¹³C multiple-quantum correlation in solids under ultra-fast MAS", J. Magn. Reson.140, p. 471-476 (1999). (Download)

K. Saalwächter, R. Graf, D.E. Demco, H.W. Spiess, "Heteronuclear double-quantum MAS NMR spectroscopy in dipolar solids", J. Magn. Reson. 139, p. 287-301 (1999). (Download)

H. Geen, R. Graf, A.S.D. Heindrichs, B.S. Hickman, I. Schnell, H.W. Spiess, J.J. Titman, "Spin counting with fast MAS", J. Magn. Reson. 138, p. 167-172 (1999). (Download)

 1998

R. Graf, D.E. Demco, S. Hafner, H.W. Spiess, "Selective residual dipolar couplings in cross-linked elastomers by 1H double-quantum NMR spectroscopy", Solid State Nucl. Mag. 12, p. 139-152 (1998). (Download)

R. Graf, A. Heuer, H.W. Spiess, "Chain-order effects in polymer melts probed by ¹H double-quantum NMR spectroscopy", Phys. Rev. Lett. 80, p. 5738-5741 (1998). (Download)

R. Graf, "Hochaufgelösende Doppelquanten-NMR-Spektroskopie an amorphen Polymeren", Shaker Verlag, Aachen, 1998.

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