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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
- Change of modulus and yielding properties of syndiotactic polypropylene with the glass transition
- Y.F. Men, G. Strobl, P. Wette. E-Polymers, 040 (2002)
- Morphological basis for the complex melting behaviour of isotactic polystyrene
- M. Al-Hussein, G. Strobl. E-Polymers, 038 (2002)
- Physik kondensierter Materie. Kristalle, Flüssigkeiten, Flüssigkristalle und Polymere
- Gert Strobl. Springer 2002, ISBN 978-3540432173
- Negative cooperativity and aggregation in biphasic binding of Mastoporan X Peptide to membranes with acidic lipids
- G. Schwarz, R. Reiter. Biophysical Chemistry 90, 269-277 (2001)
- Call for papers Special issue on "Properties of thin polymer films"
- Günter Reiter (Editor) and James Forrest (Guest Editor) Eur. Phys. J. E 5, 389 (2001)
- Mission accomplished??
- A.M. Donald, J.-F. Joanny, M. Möller and G. Reiter (Editors-in-Chief). Eur. Phys. J. E 4, 3 (2001)
- Direct visualization of random crystallization and melting in arrays of nanometer-sized polymer crystals
- G. Reiter, G. Castelein, J.-U. Sommer, A. Röttele, T. Thurn-Albrecht. Phys. Rev. Lett. 87, 226101 (2001)
- Morphogenesis of lamellar polymer crystals
- J.-U. Sommer, G. Reiter. Europhys. Lett. 56, 755 (2001)
- Dewetting of highly elastic thin polymer films
- Günter Reiter. Phys. Rev. Lett. 87, 186101 (2001)
- Spincast, thin, glassy polymer films: highly metastable forms of matter
- G. Reiter, P. G. de Gennes. Eur. Phys. J. E 6, 25-28 (2001)
- Auto-optimization of dewetting rates by rim instabilities in slipping polymer films
- G. Reiter, A. Sharma. Phys. Rev. Lett. 87, 166103 (2001)
- Liquidlike morphological transformations in mono-lamellar polymer crystals
- G. Reiter, G. Castelein, J.-U. Sommer. Phys. Rev. Lett. 86, 5918 (2001)
- Friction induced by grafted polymeric chains
- A. Casoli, M. Brendlé, J. Schultz, P. Auroy, G. Reiter. Langmuir 17, 388 (2001)
- SAXS and DSC studies of the crystallization and melting phenomena of poly(epsilon-caprolactone)
- B. Heck, E.R. Sadiku, G.R. Strobl. Macromolecular Symposia 165, 99-113 (2001)
- A new light driven spectrometer for the determination of complex heat capacities and conductivities by combination of effusivity and diffusivity measurements
- T. Albrecht, S. Armbruster, B. Stühn, K. Vogel, G. Strobl. Thermochimica Acta 377, 159-172 (2001)
- Dynamics of surface crystallization and melting in polyethylene and poly(ethylene oxide) studied by temperature-modulated DSC and heat wave spectroscopy
- T. Albrecht, S. Armbruster, S. Keller, G. Strobl. Macromolecules 34, 8456-8467 (2001)
- Critical strains determining the yield behavior of s-PP
- Y. Men, G. Strobl. Journal of Macromolecular Science - Physics B40, 775-796 (2001)
- Kinetics of reversible surface crystallization and melting in polyethylene oxide): Effect of crystal thickness observed in the dynamic heat capacity
- T. Albrecht, S. Armbruster, S. Keller, G. Strobl. European Physical Journal E 6, 237-243 (2001)
- The mechanisms of recrystallization after melting in syndiotactic polypropylene and isotactic polystyrene
- M. Al-Hussein, G. Strobl. European Physical Journal E 6, 305-314 (2001)
- Effect of the Network on the Director Fluctuations in a Nematic Side-Group Elastomer Analysed by Static and Dynamic Light Scattering
- M. Schönstein, W. Stille, and G. Strobl. Eur. Phys. J. E 5, 511 (2001)