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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
- Instability and droplet formation in evaporating thin films of a binary solution
- Leonid V. Govor, Jürgen Parisi, Gottfried H. Bauer and Günter Reiter. Phys. Rev. E 71, 051603 (2005)
- Morphology of an asymmetric ethyleneoxide-butadiene di-block copolymer in bulk and thin films
- D.M. Lambreva, R. Opitz, G. Reiter, P.M. Frederik and W.H. de Jeu. Polymer 46, 4868 (2005)
- Evolution of multilevel order in supramolecular assemblies
- F. Vonau, D. Suhr, D. Aubel, L. Bouteiller, G. Reiter and L. Simon. Phys. Rev. Lett. 94, 066103 (2005)
- Block formation during polymer crystallization
- T. Hippler, S. Jiang, G. Strobl. Macromolecules 38, 9396 (2005)
- Crystallization of a poly(ethylene-co-octene): I - A precursor structure and two competing mechanisms
- Andreas Häfele, Barbara Heck, Takahiko Kawai, Peter Kohn, Gert Strobl. Eur. Phys. J. E 16, 207-216 (2005)
- A thermodynamic multiphase scheme treating polymer crystallization and melting
- G. Strobl. Eur. Phys. J. E 18, 295-309 (2005)
- Crystallization of poly(ethylene-co-octene): II - Melt memory effects on first order kinetics
- Andreas Häfele, Barbara Heck, Thomas Hippler, Takahiko Kawai, Peter Kohn, Gert Strobl. Eur. Phys. J. E 16, 217-224 (2005)
- Dewetting on Model Surfaces: Transition from a Capillary Force Dominated to a Dissipation Dominated Regime
- Günter Reiter, Moustafa Hamieh, Nancy Baudelet, Séverine Sclavons, Pascal Damman. http://www.e-polymers.org (2004)
- Morphogenesis and non-equilibrium pattern formation in two-dimensional polymer crystallization
- Jens-Uwe Sommer and Günter Reiter. Phase Transition 77, 703-745 (2004)
- Nanoparticle ring formation in evaporating micron-size droplets
- Leonid V. Govor, Günter Reiter, Gottfried H. Bauer, Jürgen Parisi. Appl. Phys. Lett. 84, 4774-4776 (2004)
- Self-assembled nanoparticle deposits formed at the contact line of evaporating micrometer-size droplets
- Leonid V. Govor, Günter Reiter, Jürgen Parisi, and Gottfried H. Bauer. Phys. Rev. E 69, 061609 (2004)
- Biocide squirting from an elastomeric tri-layer film
- Philippe Sonntag, Pierre Hoerner, André Chemoyl, Gilles Argy, Gérard Riess, Günter Reiter. Nature Materials 3, 311-315 (2004)
- Controlled melting of individual, nano-meter-sized, polymer crystals confined in a block copolymer mesostructure
- Cvetelin Vasilev, Harry Heinzelmann, Günter Reiter. Journal of Polymer Science Part B: Polymer Physics Volume 42, 1312 – 1320 (2004)
- Crystallization mechanism of syndiotactic polypropylene analyzed by time-dependent light scattering
- T. Kawai, G. Strobl. Macromolecules 37, 2249-2255 (2004)
- The stress relaxation behavior of isotactic poly(1-butene) and its ethylene copolymers
- M. Al-Hussein M, G. Strobl. Journal of Polymer Science, Part B Polymer Physics 42, 2074-2080 (2004)
- Continuous changes in the inner order of the crystalline lamellae during isothermal crystallization of poly(is an element of-caprolactone)
- Kohn P, Strobl G. Macromolucules 37, 6823-6826 (2004)
- Interplay between domain microstructure and nematic order in liquid crystalline/isotropic block copolymers
- R. Ivanova, R. Staneva, S. Geppert, B. Heck, B. Walter, W. Gronski, B. Stühn. Coll. Polym. Science 282, 810-824 (2004)
- Nematic and Smectic Surface Order in the Isotropic-Phase of Low Molar-Mass and Polymeric Liquid-Crystals
- S. Immerschitt, H. Elben, H. Holthoff, G. Strobl. Berichte der Bunsen-Gesellschaft - Physical Chemistry Chemical Physics 98, 376-382 (1994)
- Model treatment of tensile deformation of semicrystalline polymers: Static elastic moduli and creep parameters derived for a sample of polyethylene
- Ke Hong, Ankur Rastogi, Gert Strobl. Macromolecules 37, 10174-10179 (2004)
- Equations describing lamellar structure parameters and melting points of polyethylene-co-(butene/octene)s
- Tai-Yon Cho, Barbara Heck, Gert Strobl. Coll. Polym. Science 282, 825-832 (2004)