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Neueste Veröffentlichungen

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, published online

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...)

Tuning the hydraulic resistance by swelling-induced buckling of membranes in high-aspect-ratio microfluidic devices

Claas-Hendrik Stamp, Binyam Solomon, Friederike Lang, Efstathios Mitropoulos and Thomas Pfohl.
Lab Chip 23 (2023) 3662-3670

stamp.jpgControlling fluid flow in microfluidic devices and adapting it to varying conditions by selectively regulating hydrodynamic properties is of critical importance, as the field of microfluidics faces increasingly complex challenges in its wide range of applications. One way to manipulate flows in microfluidic devices is to introduce elastic elements that can be actively or passively deformed. In this work, we developed a membrane-based microfluidic device that allows us to study the deformation of swollen thin membranes as a function of the volume fractions in binary mixtures – here isopropanol and water. (more...)


Liste der Veröffentlichungen

Influence of Progressive Cross-Linking on Dewetting of Polystyrene Thin Films
Samer Al Akhrass, Roxana-Viorela Ostaci, Yves Grohens, Eric Drockenmuller, Günter Reiter. Langmuir 24, 1884-1890 (2008)
Tuning the surface/bulk properties by the control of the amphiphilic profile in gradient copolymer
K. Karaky, C. Derail, G. Reiter, et al. Conference Information: 46th Microsymposium on Macromolecules - Nanostructured Polymers and Polymer Nanocomposites, Jul.08 - Aug.12, 2007 Prague, Czech Republic, Macromolecular Symposia 267, 31-40 (2008)
Characterizing and modeling the tensile deformation of polyethylene: The temperature and crystallinity dependences
Ke Hong, Gert Strobl. Polymer Science Series A 50, 483-493 (2008)
Zero Growth Temperature of Crystallizing Polyethylene
T. Y. Cho, W. Stille, G. Strobl. Macromolecules 40, 2596 (2007)
Zero growth temperature and growth kinetics of crystallizing poly(ε-caprolactone)
T.-Y. Cho, W. Stille, G. Strobl. Colloid Polym. Sci. 285, 931 (2007)
Progress in Understanding Polymer Crystallization
Editors: Günter Reiter and Gert Strobl. Lecture Notes in Physics 714 (2007), Springer Berlin/Heidelberg ISSN: 978-3-540-47305-3
Formation of low-dimensional close-packed arrays of nanoparticles in a dewetting water layer
Leonid V. Govor, Günter Reiter, Gottfried H. Bauer, Jürgen Parisi. Phys. Rev. E 76, 041609 (2007)
Thin Film Morphology in Triblock Terpolymers with One and Two Crystallizable Blocks
Adriana Boschetti-de-Fierro, Lea Spindler, Günter Reiter, Dania Olmos, Sergei Magonov, Volker Abetz. Macromolecules 40, 5487-5496 (2007)
Stable dispersions of highly anisotropic nanoparticles formed by cocrystallization of enantiomeric diblock copolymers
D. Portinha, F. Boue, L. Bouteiller, G. Carrot, C. Chassenieux, S. Pensec, G. Reiter. Macromolecules 40, 4037- 4042 (2007)
Cooperative Rearrangements Leading to Long Range Order in Monolayers of Supramolecular Polymers
F. Vonau, D. Aubel, L. Bouteiller, G. Reiter, L. Simon. Phys. Rev. Lett. 99, 086103 (2007)
Relaxation of Residual Stress and Reentanglement of Polymers in Spin-Coated Films
Pascal Damman, Sylvain Gabriele, Séverine Coppée, Sylvain Desprez, Didier Villers, Thomas Vilmin, Elie Raphaël, Moustafa Hamieh, Samer Al Akhrass, Günter Reiter. Phys. Rev. Lett. 99, 036101 (2007)
Switching layer stability in a polymer bilayer by thickness variation
J. P. de Silva, M. Geoghegan, A. M. Higgins, G. Krausch, M.-O. David, G. Reiter. Phys. Rev. Lett. 98, 267802 (2007)
Avantages de la réflectometrie des neutrons pour l’étude des polymères en couches minces
Günter Reiter, Mark Geoghegan. Collection SFN 8, 103-113 (2007)
Morphologies of Polymer Crystals in Thin Films
Günter Reiter, Ioan Botiz, Laetitia Graveleau, Nikolay Grozev, Krystyna Albrecht, Ahmed Mourran, Martin Möller. In "Progress in Understanding Polymer Crystallization". Eds. Günter Reiter and Gert Strobl, Lect. Notes Phys. 714, 179-200 (2007)
Influence of Substrate Properties on the Dewetting Dynamics of Viscoelastic Polymer Films
Moustafa Hamieh, Samer Al Akhrass, Tayssir Hamieh, Pascal Damman, Sylvain Gabriele, Thomas Vilmin, Elie Raphaël, Günter Reiter. J. Adhes. 83, 367-381 (2007)
The Physics of Polymers, Concepts for Understanding Their Structures and Behavior.
Gert Strobl. Third Revised and Expanded Edition, Springer 2007, ISBN 978-3-540-25278-8
Growth kinetics of polymer crystals in bulk
G. Strobl and T. Y. Cho. Eur. Phys. J. E 23, 55 (2007)
A law controlling polymer recrystallization showing up in experiments on s-polypropylene
Barbara Heck, Silvia Siegenführ, Gert Strobl and Ralf Thomann. Polymer, 48, 1352-1359 (2007)
Stabilization, Reformation and Melting of Poly(L-Lactide) Crystallites
Tai-Yon Cho, Barbara Heck, Gert Strobl. Chinese J. Polym. Sci. 25, 83 (2007)
The role of Frank elasticity in cholesteric elastomers
Werner Stille, Jürgen Schmidtke. Eur. Phys. J. E 22, 117 (2007)
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