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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
- A temperature- and molar mass-dependent change in the crystallization mechanism of poly(1-butene): Transition from chain-folded to chain-extended crystallization?
- Qiang Fu, Barbara Heck, Gert Strobl, Yi Thomann. Macromolecules 34, 2502-2511 (2001)
- Dynamics of Backbone Chain and Side Groups in a Nematic Liquid Single Crystal Elastomer Studied by Combined Mechanical and Stress-optical Measurements
- F. Schmidt, J. Siepmann, W. Stille and G. R. Strobl. Mol. Cryst. Liq. Cryst. 350, 103 (2000)
- Negative excess interfacial entropy between free and end-grafted chemically identical polymers
- G. Reiter, R. Khanna. Phys. Rev. Lett. 85, 5599-5602 (2000)
- The ABC of Pattern Evolution in Self-destruction of Thin Polymer Films
- R. Khanna, A. Sharma, G. Reiter. EPJdirect E 2, 1-9 (2000)
- Enhanced Instability in Thin Liquid Films by Improved Compatibility
- G. Reiter, R. Khanna, A. Sharma. Phys. Rev. Lett. 85, 1432-1435 (2000)
- Friction of an Elastomer Sliding on Polymeric Model Surfaces
- A. Casoli, M. Brendlé, J. Schultz, P. Auroy, G. Reiter. Tribology Lett. 8, 249-253 (2000)
- Real time determination of the slippage length in autophobic polymer dewetting
- G. Reiter, R. Khanna. Phys. Rev. Lett. 85, 2753-2756 (2000)
- Kinetics of Autophobic Dewetting of Polymer Films
- G. Reiter, R. Khanna. Langmuir 16, 6351-6357 (2000)
- Morphologies of Diblock Copolymer Thin Films Before and After Crystallization
- G. Reiter, G. Castelein, P. Hoerner, G. Riess, J.-U. Sommer, G. Floudas. Eur. Phys. J. E. 2, 319-334 (2000)
- Polymer Crystallization in Quasi-2 Dimensions: II. Kinetic Models and Computer Simulations
- J.-U. Sommer, G. Reiter. J. Chem. Phys. 112, 4384-4393 (2000)
- Polymer Crystallization in Quasi-2 Dimensions: I. Experimental Results
- G. Reiter, J.-U. Sommer. J. Chem. Phys. 112, 4376-4383 (2000)
- Capillary rise in glass fabrics.
- J.M. Senecot, M. Nardin, G. Reiter, J. Schultz, P. Christou, P. Henrat. Le Vide: Science, Technique et Applications 296, 440-445 (2000)
- Etude par microscopie à force atomique de la cristallisation de polymères
- G. Reiter, G. Castelein, J.U. Sommer, L. Vidal. Actes du Forum des Microscopies à Sonde Locale, Marly le Roi, 7-9 mars 2000, p. 68-69
- Block crystallization in model triarm star block copolymers with two crystallizable blocks. A time-resolved SAXS-WAXS study
- G. Floudas, G. Reiter, O. Lambert, P. Dumas, F.J. Yeh, B. Chu. In: Scattering from Polymers: Characterization by X-rays, Neutrons, and Light. ACS Symposium Series 739 (2000) 448-455
- Light scattering by fluctuations within a nematic wetting layer in a isotropic phase of a liquid crystal
- R. Sigel, G. Strobl. Journal of Chemical Physics 112, 1029-1039 (2000)
- Temperature and strain rate independence of critical strains in polyethylene and poly(ethylene-co-vinyl acetate)
- S. Hobeika, Y. Men, G. Strobl. Macromolecules 33, 1827-1833 (2000)
- Investigating the mechanisms of polymer crystallization by SAXS experiments
- G. Hauser, J. Schmidtke, G. Strobl, T. Thurn-Albrecht. ACS Symposium Series 739, 140-151 (2000)
- Static and Dynamic Light Scattering of a Nematic Side-Group Polysiloxane
- Jürgen Schmidtke, Werner Stille, and Gert Strobl. Macromolecules 33, 2922 (2000)
- Isothermal crystallization and melting of isotactic polypropylene analyzed by time- and temperature-dependent small-angle X-ray scattering experiments
- M. Iijima, G. Strobl. Macromolecules 33, 5204-5214 (2000)
- From the melt via mesomorphic and granular crystalline layers to lamellar crystallites: A major route followed in polymer crystallization?
- G. Strobl. Eur. Phys. J. E 3, 165 (2000)