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Neueste Veröffentlichungen
Temperature dependence of crystal – melt coexistence for supported polyethylene filaments
Da Huang, Thorsten Hugel, Bizan N. Balzer, Günter Reiter. Nature Communications 16 (2025) 11127
The broken symmetry of molecular interactions at interfaces is causing that crystals are often covered by a thin liquid layer of their own melt. Such crystal–melt coexistence can be related to phenomena of surface premelting, secondary nucleation and melting point depression, particularly important for small systems. Here, we employed intermittent-contact mode atomic force microscopy imaging on nanoscopic semi-cylindrical filaments of polyethylene on a substrate to observe that these filaments contained a crystalline core bounded by molten regions of rather uniform width, W_soft= (9 ± 2) nm at room temperature, which increased reversibly with temperature T. Filaments smaller than ca. 2∙W_soft (T) were completely molten. The values of W_soft (T) compared favorably with theoretically predicted characteristic length scales in the context of nucleation, surface premelting and the melting point depression of finite size crystals. Altogether, we show that these three phenomena are related and dominated by the intermolecular forces acting at crystal surfaces.
Crystallization of Layers of Strongly Adsorbed Poly(ethylene terephthalate) on Silicon Substrates
Liang Chen, Zhihang Bian, Xiaonan Li, Zhenwei Jiang, Jianquan Xu, Decai Lin, Guenter Reiter, Jichun You, Xinping Wang. Macromolecules 58 (2025) 12222–12230
We examined the crystallization behavior of ultrathin layers of strongly adsorbed poly(ethylene terephthalate) (PET) chains on silicon substrates, yielding a characteristic morphology of uniquely curved dendritic polymer crystals. The observed curvature resulted from bent edge-on lamellar crystals from which terraced flat-on branched lamellar crystals grew essentially from the convex outer side. The degree of bending increased with decreasing crystallization temperature and increasing strength of polymer/substrate interactions. We propose that unbalanced stresses acting on the fold surfaces of PET lamellar crystals, probably induced by strong interactions with the substrate, were responsible for the observed curvature of the lamellar crystals. (more...)
Crystallization and Melting of Polyethylene Strongly Cross-linked in the Molten State
Jingqing Li, Weihua Wang, Yunxiang Shi, Barbara Heck, Chuanfu Luo, Jesper de Claville Christiansen, Donghong Yu, Günter Reiter, Shichun Jiang. Soft Matter 21 (2025) 6422
We examined the crystallization and melting behavior of highly cross-linked polyethylene (xPE) samples, including structural characterization of the resulting crystalline domains. Using γ-ray irradiation, cross-linking was performed in the molten state and not in the solid state. This approach assured a statistical and homogeneous distribution of the cross-link points. Upon increasing the radiation dose, the molecular weight of the strands connecting the cross-link points reached values even lower than that of the strands between physical entanglements. (more...)
Liste der Veröffentlichungen
- Deformation of cholesteric elastomers by uniaxial stress along the helix axis
- Werner Stille. Eur. Phys. J. E 28, 57-71 (2009)
- 高分子物理学: 理解其结构和性质的基本概念
- 作者:(德国)G.斯特罗伯 译者:胡文兵 蒋世春 门永峰 北京:科学出版社 2009, ISBN 978-7-03-022441-5
- Metastable Untwisted States in Cholesteric Elastomers
- Werner Stille. Macromolecules 42, 7979-7981 (2009)
- Gradient Interfaces in SBS and SBS/PS Blends and Their Influence on Morphology Development and Material Properties
- Yi Thomann, Ralf Thomann, Alfred Hasenhindl, Rolf Mülhaupt, Barbara Heck, Konrad Knoll, Helmut Steininger, Kay Saalwächter. Macromolecules 42, 5684-5699 (2009)
- Understanding crystal orientation in quasi-one-dimensional polymer systems
- Yu Ma, Wenbing Hu, Jamie Hobbs, Guenter Reiter. Soft Matter 4, 540-543 (2008)
- Oligonucleotide nanostructured surfaces: effect on Escherichia coli curli expression
- Nicolas Cottenye, Francisco Teixeira Jr., Arnaud Ponche, Günter Reiter, Karine Anselme, Wolfgang Meier, Lydie Ploux, Corinne Vebert-Nardin. Macromolecular Bioscience 8, 1161-1172 (2008)
- Morphological Instabilities of Polymer Crystals
- Nikolay Grozev, Ioan Botiz, Günter Reiter. Eur. Phys. J. E 27, 63-71 (2008)
- Crystal nucleation enhanced at the diffusive interface of immiscible polymer blends
- Yu Ma, Liyun Zha, Wenbing Hu, Günter Reiter, Charles C. Han. Phys. Rev. E 77, 061801 (2008)
- Semicrystalline Macromolecular Design by Nitroxide-Mediated Polymerization
- Khaled Karaky, Gérald Clisson, Günter Reiter, Laurent Billon. Macromol. Chem. Phys. 209, 715–722 (2008)
- Viscoelastic Thin Polymer Films under Transient Residual Stresses: Two-Stage Dewetting on Soft Substrates
- S. Al Akhrass, G. Reiter, S.Y. Hou, M. H. Yang, Y. L. Chang, F. C. Chang, C. F. Wang, A. C.-M. Yang. Phys. Rev. Lett. 100, 178301 (2008)
- The Influence of Protic Non-Solvents Present in the Environment on Structure Formation of Poly(γ-benzyl-L-glutamate) in Organic Solvents
- Ioan Botiz, Nikolay Grozev, Helmut Schlaad, Günter Reiter. Soft Matter, 4, 993-1002 (2008)
- Influence of Progressive Cross-Linking on Dewetting of Polystyrene Thin Films
- Samer Al Akhrass, Roxana-Viorela Ostaci, Yves Grohens, Eric Drockenmuller, Günter Reiter. Langmuir 24, 1884-1890 (2008)
- Tuning the surface/bulk properties by the control of the amphiphilic profile in gradient copolymer
- K. Karaky, C. Derail, G. Reiter, et al. Conference Information: 46th Microsymposium on Macromolecules - Nanostructured Polymers and Polymer Nanocomposites, Jul.08 - Aug.12, 2007 Prague, Czech Republic, Macromolecular Symposia 267, 31-40 (2008)
- Characterizing and modeling the tensile deformation of polyethylene: The temperature and crystallinity dependences
- Ke Hong, Gert Strobl. Polymer Science Series A 50, 483-493 (2008)
- Zero Growth Temperature of Crystallizing Polyethylene
- T. Y. Cho, W. Stille, G. Strobl. Macromolecules 40, 2596 (2007)
- Zero growth temperature and growth kinetics of crystallizing poly(ε-caprolactone)
- T.-Y. Cho, W. Stille, G. Strobl. Colloid Polym. Sci. 285, 931 (2007)
- Progress in Understanding Polymer Crystallization
- Editors: Günter Reiter and Gert Strobl. Lecture Notes in Physics 714 (2007), Springer Berlin/Heidelberg ISSN: 978-3-540-47305-3
- Formation of low-dimensional close-packed arrays of nanoparticles in a dewetting water layer
- Leonid V. Govor, Günter Reiter, Gottfried H. Bauer, Jürgen Parisi. Phys. Rev. E 76, 041609 (2007)
- Thin Film Morphology in Triblock Terpolymers with One and Two Crystallizable Blocks
- Adriana Boschetti-de-Fierro, Lea Spindler, Günter Reiter, Dania Olmos, Sergei Magonov, Volker Abetz. Macromolecules 40, 5487-5496 (2007)
- Stable dispersions of highly anisotropic nanoparticles formed by cocrystallization of enantiomeric diblock copolymers
- D. Portinha, F. Boue, L. Bouteiller, G. Carrot, C. Chassenieux, S. Pensec, G. Reiter. Macromolecules 40, 4037- 4042 (2007)