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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
- On the Kinetics of Isothermal Crystallization of Branched Polyethylene
- G.R. Strobl, T. Engelke, E. Madarek, G. Urban. Polymer 24, 1585-1589 (1983)
- Kristallisation und Schmelzverhalten von Fraktionen verzweigten Polyethylens. 1. Darstellung und Charakterisierung der Fraktionen
- Eugeniusz Maderek, Gert R. Strobl. Makromolekulare Chemie - Macromolecular Chemistry and Physics 184, 2553-2561 (1983)
- Raman Spectrum of the High Pressure Phase of Polyethylene
- R. Eckel, H. Schwickert, M. Buback, G.R. Strobl. Polymer Bulletin 6, 559-564 (1982)
- Die Kristallstruktur von Cycloalkanen
- Thomas Trzebiatowski, Martin Dräger, Gert R. Strobl. Makromolekulare Chemie - Macromolecular Chemistry and Physics 183, 731-744 (1982)
- Zum Mechanismus der Polymerkristallisation
- G. R. Strobl, T. Engelke, H. Meier, G. Urban. Coll. Polym. Sci. 260, 394-403 (1982)
- Pressure induced changes in the Raman spectra of liquid n-alkanes and perfluoro-n-alkanes
- H. Schwickert, G. R. Strobl and R. Eckel. Coll. Polym. Sci. 260, 588-593 (1982)
- Untersuchung der druckinduzierten Kristallisation von Polyäthylen mit Hilfe einer neuen Raman-Hochdruckzelle
- R. Eckel, M. Buback und G. R. Strobl. Coll. Polym. Sci. 259, 326-334 (1981)
- Model of Partial Crystallization and Melting Derived from Small-Angle X-Ray-Scattering and Electron-Microscopic Studies on Low-Density Polyethylene
- G.R. Strobl, M.J. Schneider, I.G. Voigt-Martin. J. Polym. Sci. B - Polymer Physics 18, 1361-1381 (1980)
- Direct Evaluation of the Electron Density Correlation Function of Partially Crystalline Polymers
- G.R. Strobl, M. Schneider. J. Polym. Sci. B - Polymer Physics 18, 1343-1359 (1980)
- Analysis of the Intensities of the Longitudinal Acoustic Vibtrations in n-Alkanes and Polyethylene
- G.R. Strobl, R. Eckel. Coll. Polym. Sci. 258, 570-577 (1980)
- Phase-Transitions in Crystals of Chain Molecules. Relation between Defect Structures and Molecular Motion in the four Modifications of n-C33H68
- B. Ewen, G.R. Strobl, D. Richter. Faraday Discussions 69, 19-31 (1980)
- Molecular Orientational Correlations and Local Order in n-Alkane Liquids
- E.W. Fischer, G.R. Strobl, M. Dettenmaier, M. Stamm, N. Steidle. Faraday Discussions 68, 26-45 (1979)
- Einige polymerspezifische Anwendungen der Schwingungsspektroskopie
- G.R. Strobl. Coll. Polym. Sci. 257, 584-590 (1979)
- Circular Fluorescence Polarization of Achiral Molecules in Cholesteric Liquid Crystals
- H. Stegemeyer, W. Stille and P. Pollmann. Israel J. Chem. 18, 312 (1979)
- Molekulare Deutung der Umwandlungswärmen bei den Modifikationsübergängen des n-Tritriacontans
- G.R. Strobl. Coll. Polym. Sci. 256, 427-445 (1978)
- Raman Spectroscopic Method for Determining Crystallinity of Polyethylene
- G.R. Strobl, W. Hagedorn. J. Polym. Sci. Part B - Polymer Physics 16, 1181-1193 (1978)
- Molecular-Motion, Thermal-Expansion, and the Phase-Transitions in Paraffins: A Model for Polymers
- G.R. Strobl. J. Polym. Sci. Part C - Polymer Symposium 59, 121-142 (1977)
- Die molekularen Grundlagen der anisotropen thermischen Ausdehnung von Paraffinen und Polyäthylen. Eine ramanspektroskopische Untersuchung am Beispiel des N-Tritriacontans
- G.R. Strobl. Coll. Polym. Sci. 254, 170-189 (1976)
- Packing of Paraffin Chains in 4 Stable Modifications of n-Tritriacontane
- W. Piesczek, G.R. Strobl, K. Malzahn. Acta Cryst. B 30, 1278 (1974)
- Defect Structure and Molecular-Motion in 4 Modifications of Normal-Tritriacontane. 2. Study of Molecular-Motion Using Infrared Spectroscopy and Wide-Line Nuclear Magnetic-Resonance Measurements
- B. Ewen, E.W. Fischer, W. Pieszek, G. Strobl. J. Chem. Phys. 61, 5265-5272 (1974)