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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
- Understanding of the tensile deformation in HDPE/LDPE blends based on their crystal structure and phase morphology
- Qiang Fu, Yongfeng Men, Gert Strobl. Polymer 44, 1927-1933 (2003)
- Critical strains in poly(epsilon-caprolactone) and blends with poly(vinyl methyl ether) and poly(styrene-co-acrylonitrile)
- Yongfeng Men, Gert Strobl. Macromolcules 36, 1889-1898 (2003)
- On the mechanisms of recrystallization after melting in semicrystalline polymers: The effect of the initial melt state
- M. Al-Hussein, G. Strobl. Journal of Macromolecular Science - Physics B42, 677-685 (2003)
- Fluorescence of a dye-doped cholesteric liquid crystal film in the region of the stop band: theory and experiment
- J. Schmidtke and W. Stille. Eur. Phys. J. B 31, 179 (2003)
- Investigating polymer crystallization by time-dependent light scattering: a direct approach in the data analysis applied for s-polypropylene
- Anke Hoffmann, Gert Strobl. Polymer 44, 5803-5809 (2003)
- Defect Mode Emission of a Dye Doped Cholesteric Polymer Network
- J. Schmidtke, W. Stille, H. Finkelmann. Phys. Rev. Lett. 90, 083902 (2003)
- Condensed Matter Physics: Crystals, Liquids, Liquid Crystals, and Polymers
- Gert Strobl. Springer 2003, ISBN 978-3540003533
- Role of the entangled amorphous network in tensile deformation of semicrystalline polymers
- Y. F. Men, J. Rieger, G. Strobl. Physical Review Letters 91, 095502 (2003)
- Photonic defect modes in cholesteric liquid crystal films
- J. Schmidtke and W. Stille. Eur. Phys. J. E 12, 553 (2003)
- Characteristic variations in the effect of diluents on polymer crystallization and melting observed for a sample of poly (ethylene-co-octene)
- Barbara Heck, Gert Strobl, Michael Grasruck. Eur. Phys. J. E 11, 117-130 (2003)
- Editorial: Special issue on Properties of Thin Polymer Films
- Günter Reiter (Editor) and James Forrest (Guest Editor). Eur. Phys. J. E 8, 101 (2002)
- Morphological Phase Transitions in Spontaneous Dewetting of Thin Films on Homogeneous and Heterogeneous Surfaces
- A. Sharma, G. Reiter. Phase Transitions 75, 377-399 (2002)
- Pattern formation and ordering in thin films of crystallisable block copolymers
- Günter Reiter, Gilles Castelein, Jens-Uwe Sommer. Macromol. Symp. 183, 173–178 (2002)
- Some relevant parameters affecting the glass transition of supported ultra-thin polymer films
- Y. Grohens, L. Hamon, G. Reiter, A. Soldera, Y. Holl. Eur. Phys. J. E 8, 217-224 (2002)
- Are changes in morphology clear indicators for the glass transition in thin polymer films? Tentative ideas
- Günter Reiter. Eur. Phys. J. E 8, 251-255 (2002)
- The melting line, the crystallization line, and the equilibrium melting temperature of isotactic polystyrene
- M. Al-Hussein, G. Strobl. Macromolecules 35, 1672-1676 (2002)
- From crystalline block slips to dominance of network stretching - Mechanisms of tensile deformation in semi-crystalline polymers
- Yongfeng Men, Gert Strobl. Chinese Journal of Polymer Science 20, 161-170 (2002)
- Role and importance of radius of gyration of chains in the melt in the crystalization of poly(1-butene)
- Qiang Fu, Gert Strobl. Chinese Journal of Polymer Science 20, 143-154 (2002)
- Evidence for a mechanically active high temperature relaxation process in syndiotactic polypropylene
- Yongfeng Men, Gert Strobl. Polymer 43, 2761-2768 (2002)
- Strain-controlled tensile deformation behavior of isotactic poly(1-butene) and its ethylene copolymers
- M. Al-Hussein, G. Strobl. Macromolecules 35, 8515-8520 (2002)