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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
- X-ray Reflectometer for Study of Polymer Thin Films and Interfaces
- M. Foster, M. Stamm, G. Reiter, S. Hüttenbach. Vacuum, 41, 1441-1444 (1990)
- Positron Lifetime Investigations on Linear Polyethylene Compared to Branched Polyethylene
- G. Reiter, P. Kindl. phys. stat. sol. (a) 118, 161-168 (1990)
- Concentration-Dependence of the Flory-Huggins Interaction Parameter of a Polymer Blend as Determined by Small-Angle X-Ray-Scattering Experiments
- T. Koch, G.R. Strobl. Journal of Polymer Science B - Polymer Physics 28, 343-353 (1990)
- Positron Lifetime Investigations on Polymethylmethacrylate
- P. Kindl, G. Reiter. In: Positron Annihilation, Ed. L. Dorikens-Vanpraet, M. Dorikens, and D. Segers, World Scientific, Singapore 1989 (p.806)
- A Neutron Reflectometer for the Investigation of Solid and Liquid Interfaces
- M. Stamm, G. Reiter, S. Hüttenbach. Physica B 156, 564-566 (1989)
- Kinetics of Relaxation and Unmixing in Polymer Blends as Studied by X-Ray-Scattering
- G. Strobl. Makromolekulare Chemie - Macromolecular Symposia 26, 413-429 (1989)
- X-Ray-Scattering Study of Molecular Order in a Liquid Crystal-Side Group Polysiloxane
- W. Hotz, G. Strobl. Colloid and Polymer Science 267, 889-898 (1989)
- Interdiffusion in the Partially Miscible Polymer Blend of Deuterated Polystyrene and Poly(styrene-co-bromostyrene)
- F. Bruder, R. Brenn, B. Stühn, G.R. Strobl. Macromolecules 22, 4434-4437 (1989)
- Structure Relaxation after Temperature Jumps in Homogeneous Polystyrene Poly(styrene-co-bromostyrene) Blends
- G.R. Strobl, G. Urban. Colloid and Polymer Science 266, 398-404 (1988)
- Soliton dynamics and impurities in the Pariser-Parr-Pople model of alternating trans-polyacetylen
- R. Markus, W. Förner, J. Ladik. Solid States Communications 68, 135-138 (1988)
- Investigations on Low Temperature Transitions and Time Effects of Branched Polyethylene by the Positron Lifetime Technique
- P. Kindl, G. Reiter. phys. stat. sol. (a) 104, 707 (1987)
- Small-Angle X-Ray-Scattering Study of Spinodal Decomposition in Polystyrene Poly(styrene-co-bromostyrene) Blends
- H. Meier, G.R. Strobl. Macromolecules 20, 649-654 (1987)
- Surface Melting in Melt-Crystallized Linear Polyethylene
- Y. Tanabe, G.R. Strobl, E.W. Fischer. Polymer 27, 1147-1153 (1986)
- Thermally Reversible Phase Separation in Polystyrene Poly(styrene-co-4-bromostyrene) Blends
- G.R. Strobl, J.T. Bendler, R.P. Kampour, A.R. Shultz. Macromolecules 19, 2683-2689 (1986)
- Structure Evolution during Spinodal Decomposition of Polymer Blends
- G.R. Strobl. Macromolecules 18, 558-563 (1985)
- Dielectric Relaxation of Liquid Crystalline Polyacrylates and Polymethacrylates
- R. Zentel, G.R. Strobl, H. Ringsdorf. Macromolecules 18, 960-965 (1985)
- Structures of Liquid Crystalline Side Group Polymers Oriented by Drawing
- R. Zentel, G.R. Strobl. Makromolekulare Chemie - Macromolecular Chemistry and Physics 185, 2669-2676 (1984)
- Molecular-Motion, Defect Structures and Phase-Transitions in Oligomer Crystals
- G.R. Strobl, H. Schwickert, T. Trzebiatowski. Berichte der Bunsen-Gesellschaft - Physical Chemistry Chemical Physics 87, 274-279 (1983)
- Crystallization and Melting of Fractions of Branched Polyethylene. 2. Dilatometric and Small-Angle X-Ray-Scattering Study on the Molecular Weight Dependence of Isothermal Crystallization
- E. Maderek, G.R. Strobl. Coll. Polym. Sci. 261, 471-476 (1983)
- Effect of Amorphous Sequences on the Longitudinal Acoustic Modes in Partially Crystalline Polymers. 1. Transfer Matrix Method
- G.R. Strobl. J. Polym. Sci. B - Polymer Physics 21, 1357-1380 (1983)