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Neueste Veröffentlichungen

"Printing" on Polymer Single Crystals through Microregional Heating

Tianyu Wu, Haimu Ye, Xinyi Pan, Yaning He, Jun Xu, Günter Reiter. ACS Appl. Polym. Mater. published online.

tianyu.jpgPolymer single crystals are composed of well-ordered polymer chains and possess a characteristic symmetric shape. If one can precisely control the microregional morphology, polymer single crystals have the potential to be used as functional templates for applications like information storage or cell culture. However, with current experimental approaches, it is rather difficult to generate predictable structures of defined size within polymer single crystals. Here, we propose a research strategy based on a combination of fluorescence labeling and microregional heating by irradiation with focused red light. This approach enabled us to locally heat single crystals while simultaneously following the thereby induced changes via fluorescence imaging with a micrometer lateral resolution. We found that polymers diffused out of the heated region within a stacked single crystal and thereby produced a hole at the irradiated location. (more...)

Mechanism for the Formation of Millimeter-Long Solid Filaments by Spin Coating Dilute Solutions of a Crystallizable Polymer

Da Huang, Thorsten Hugel, and Günter Reiter. Macromolecules 2024, 57, 3696–3705

huang.jpgWe have investigated the formation of millimeter-long filaments induced by spin-coating ca. 130 °C dilute para-xylene solutions of rapidly crystallizable polyethylene chains with a contour length in the micrometer range onto ca. 80 °C mica substrates. These filaments were radially oriented and accumulated on the periphery of the substrate. Our observations can be explained by the stretching of polymers through the flow field induced by spinning the solution on a solid substrate. The corresponding loss in conformational entropy emphasized attractive interactions between polymers, which resulted in the formation of bundles and their assembly into long filaments. Caused by a Plateau–Rayleigh-type instability of a liquid coating on a solid filament and due to crystallization, these filaments were decorated with various small-scale structures. (more...)

Competing influences of cooling rate and diluent concentration on crystallization of poly(3-hexylthiophene)

Mina Alizadehaghdam, Farhang Abbasi, Günter Reiter. J. Phys. Chem. C 128 (2024) 4757–4765

mina.jpgCrystallization of poly(3-hexylthiophene) (P3HT) was studied in mixtures of different concentrations of 3-hexylthiophene (3HT) as a diluent. Two coexisting crystal populations, socalled “thin” and “thick” crystals, with melting temperatures differing by more than 10 °C were observed in these mixtures. Intriguingly, the “thick” crystals represented transient unstable structures, with a mass fraction that was the highest ФH for rapidly crystallized P3HT in presence of significant amount of diluent. Reflecting its dependence on growth kinetics, ФH decreased with increasing crystallization temperature, extended crystallization time or lower cooling rate. The presence of a diluent led to a “depression” of the melting temperature, described by Raoult’s law and the Flory equation, which was similar for P3HT samples crystallized in various ways. (more...)


Liste der Veröffentlichungen

The role of Frank elasticity in cholesteric elastomers
Werner Stille, Jürgen Schmidtke. Eur. Phys. J. E 22, 117 (2007)
Investigation of polymer crystallization kinetics with time dependent light attenuation measurements
J. Fritsch, W. Stille, G. Strobl. Colloid Polym. Sci. 284, 620 (2006)
Viscoelastic dewetting of constrained polymer thin films
Pascal Damman, Séverine Sclavons, Sylvain Gabriele, Sylvain Desprez, Günter Reiter, Moustafa Hamieh, Samer Al Akhrass, Thomas Vilmin, Elie Raphaël. Journal of Polymer Science Part B: Polymer Physics 44, 3022-3030 (2006)
Lamellar Crystal Orientations Biased by Crystallization Kinetics in Polymer Thin Films
Yu Ma, Wenbing Hu, Günter Reiter. Macromolecules 39, 5159-5164 (2006)
Disentanglement Time of Polymers Determines the Onset of Rim Instabilities in Dewetting
Sylvain Gabriele, Séverine Sclavons, Günter Reiter, Pascal Damman. Phys. Rev. Lett. 96, 156105 (2006)
The Formation of Ordered Polymer Structures at Interfaces
J.-U. Sommer and G. Reiter Advances in Polymer Science, 200, 1-36 (2006)
Elastomer polymer brushes on flat surface by bimolecular surface-initiated nitroxide mediated polymerization
Julien Parvole, Jean-Pierre Montfort, Günter Reiter, Oleg Borisov, Laurent Billon. Polymer, 47, 972-981 (2006)
The role of nonlinear friction in the dewetting of thin polymer films
T. Vilmin, E. Raphaël, P. Damman, S. Sclavons, S. Gabriele, M. Hamieh, G. Reiter. Europhys. Lett. 73, 906 - 912 (2006)
Self-Assembly of Nanoparticle Ring Patterns
Jürgen Parisi, Leonid V. Govor, Gottfried H. Bauer, Günter Reiter. Zeitschrift für Naturforschung Section A, A journal of physical sciences 61, 99-102 (2006)
Bilayer formation in thin film of a binary solution
Leonid V. Govor, Günter Reiter, Gottfried H. Bauer, Jürgen Parisi. Physics Letters A 353, 198–204 (2006)
Ordered Polymeric Nanostructures at Surfaces
Editors: G. Julius Vancso and Günter Reiter. Advances in Polymer Science 200 (2006), Springer Berlin/Heidelberg, ISBN: 3-540-31921-2, DOI: 10.1007/11605294, ISSN: 0065-3195 (Paper) 1436-5030 (Online)
Amorphous Thin Polymers Films: Consequences of Residual Stresses
G. Reiter, M. Hamieh, S. Al Akhrass, S. Sclavons, S. Gabriele, P. Damman, T. Vilmin, E. Raphaël. Makromolekulares Kolloquium Freiburg, “Macromolecular Bioscience”. 6 (2), F95 (2006)
Treelike branched structures formed in dewetting thin films of a binary solution
Leonid V. Govor, Günter Reiter, Gottfried H. Bauer, Jürgen Parisi. Appl. Phys. Lett. 89, 133126 (2006)
Self-assembled tree-like patterns from an evaporating binary solution
Leonid V. Govor, Günter Reiter, Gottfried H. Bauer, Jürgen Parisi. Phys. Rev. E 74, 061603 (2006)
Crystallization of block copolymers in restricted cylindrical geometries
Cvetelin Vasilev, Günter Reiter, Stergios Pispas, Nikos Hadjichristidis Polymer, 47, 330-340 (2006)
Network stretching during tensile drawing of polyethylene: A study using X-ray scattering and microscopy
Ke Hong, Gert Strobl. Macromulecules 39, 268-273 (2006)
Temperature dependent variations in the lamellar structure of poly(L-lactide)
Tai-Yon Cho, Gert Strobl. Polymer 47, 1036-1043 (2006)
Viscous-force-dominated tensile deformation behavior of oriented polyethylene
B. Na, Q. Zhang, Q. Fu, Y.F. Men, K. Hong, G. Strobl. Macromolecules 39, 2584-2591 (2006)
Low-field NMR studies of polymer crystallization kinetics: changes in the melt dynamics
C. Hertlein, K.Saalwächter, G. Strobl. Polymer 47, 7216 (2006)
Crystallization and Melting of Bulk Polymers: New Observations, Conclusions and a Thermodynamic Scheme
Gert Strobl. Prog. Polym. Sci. 31, 398 (2006)
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