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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
- Ordered Polymeric Nanostructures at Surfaces
- Editors: G. Julius Vancso and Günter Reiter. Advances in Polymer Science 200 (2006), Springer Berlin/Heidelberg, ISBN: 3-540-31921-2, DOI: 10.1007/11605294, ISSN: 0065-3195 (Paper) 1436-5030 (Online)
- Amorphous Thin Polymers Films: Consequences of Residual Stresses
- G. Reiter, M. Hamieh, S. Al Akhrass, S. Sclavons, S. Gabriele, P. Damman, T. Vilmin, E. Raphaël. Makromolekulares Kolloquium Freiburg, “Macromolecular Bioscience”. 6 (2), F95 (2006)
- Treelike branched structures formed in dewetting thin films of a binary solution
- Leonid V. Govor, Günter Reiter, Gottfried H. Bauer, Jürgen Parisi. Appl. Phys. Lett. 89, 133126 (2006)
- Self-assembled tree-like patterns from an evaporating binary solution
- Leonid V. Govor, Günter Reiter, Gottfried H. Bauer, Jürgen Parisi. Phys. Rev. E 74, 061603 (2006)
- Crystallization of block copolymers in restricted cylindrical geometries
- Cvetelin Vasilev, Günter Reiter, Stergios Pispas, Nikos Hadjichristidis Polymer, 47, 330-340 (2006)
- Network stretching during tensile drawing of polyethylene: A study using X-ray scattering and microscopy
- Ke Hong, Gert Strobl. Macromulecules 39, 268-273 (2006)
- Temperature dependent variations in the lamellar structure of poly(L-lactide)
- Tai-Yon Cho, Gert Strobl. Polymer 47, 1036-1043 (2006)
- Viscous-force-dominated tensile deformation behavior of oriented polyethylene
- B. Na, Q. Zhang, Q. Fu, Y.F. Men, K. Hong, G. Strobl. Macromolecules 39, 2584-2591 (2006)
- Low-field NMR studies of polymer crystallization kinetics: changes in the melt dynamics
- C. Hertlein, K.Saalwächter, G. Strobl. Polymer 47, 7216 (2006)
- Crystallization and Melting of Bulk Polymers: New Observations, Conclusions and a Thermodynamic Scheme
- Gert Strobl. Prog. Polym. Sci. 31, 398 (2006)
- Time dependent light attenuation measurements used in studies of the kinetics of polymer crystallization
- Barbara Heck, Takahiko Kawai, Gert Strobl. Polymer 47, 5538-5543 (2006)
- 凝縮系物理学: 結晶からソフトマターへ
- G. ストローブル (著), 田口 健 (翻訳), 深尾 浩次 (翻訳). 出版社: シュプリンガー・ジャパン(株) 2006, ISBN 978-4431712206
- Variation of the Network Anisotropy of Cholesteric Side Chain Elastomers
- Christian Bourgerette, Bin Chen, Heino Finkelmann, Michel Mitov, Jürgen Schmidtke, Werner Stille. Macromolecules 39, 8163 (2006)
- Effects of comonomers on lamellar and noncrystalline microstructure of ethylene copolymers
- T.Y. Cho, E.J. Shin, W. Jeong, B. Heck, R. Graf, G. Strobl, H.W. Spiess, D.Y. Yoon. Macromolecular Rapid Communications 27, 322-327 (2006)
- Deriving Molecular Parameters of Interfaces Between Chemically Identical Polymers from Macroscopically Observed Phenomena
- Günter Reiter. Macromol. Symp. 229, 81–92 (2005)
- Structure Formation of Polystyrene-block-poly(gamma-benzyl L-glutamate) in Thin Films
- S. Ludwigs, G. Krausch, G. Reiter, M. Losik, M. Antonietti, H. Schlaad. Macromolecules 38, 7532 (2005)
- Residual stresses in thin polymer films cause rupture and dominate early stages of dewetting
- Günter Reiter, Moustafa Hamieh, Pascal Damman, Séverine Sclavons, Sylvain Gabriele, Thomas Vilmin, Elie Raphaël. Nature Materials 4, 754 (2005)
- Reply: Discussion of problems of non-equilibrium thermodynamics of polymers
- J.-U. Sommer and G. Reiter. Thermochimica Acta, 432, 153 (2005)
- Crystallization in Ultra-Thin Polymer Films/ Morphogenesis and Thermodynamical Aspects
- J.-U. Sommer and G. Reiter. Thermochimica Acta, 432, 135 (2005)
- Evolution of rim instabilities in the dewetting of slipping thin polymer films
- Günter Reiter. J. Adhesion 81, 381 (2005)