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.