Publications
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Recent Publications
"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.
Polymer 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...)
Da Huang, Thorsten Hugel, and Günter Reiter. Macromolecules 2024, 57, 3696–3705
We 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...)
Mina Alizadehaghdam, Farhang Abbasi, Günter Reiter. J. Phys. Chem. C 128 (2024) 4757–4765
Crystallization 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...)
List of Publications
- 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)
- A temperature- and molar mass-dependent change in the crystallization mechanism of poly(1-butene): Transition from chain-folded to chain-extended crystallization?
- Qiang Fu, Barbara Heck, Gert Strobl, Yi Thomann. Macromolecules 34, 2502-2511 (2001)
- Dynamics of Backbone Chain and Side Groups in a Nematic Liquid Single Crystal Elastomer Studied by Combined Mechanical and Stress-optical Measurements
- F. Schmidt, J. Siepmann, W. Stille and G. R. Strobl. Mol. Cryst. Liq. Cryst. 350, 103 (2000)
- Negative excess interfacial entropy between free and end-grafted chemically identical polymers
- G. Reiter, R. Khanna. Phys. Rev. Lett. 85, 5599-5602 (2000)
- The ABC of Pattern Evolution in Self-destruction of Thin Polymer Films
- R. Khanna, A. Sharma, G. Reiter. EPJdirect E 2, 1-9 (2000)
- Enhanced Instability in Thin Liquid Films by Improved Compatibility
- G. Reiter, R. Khanna, A. Sharma. Phys. Rev. Lett. 85, 1432-1435 (2000)
- Friction of an Elastomer Sliding on Polymeric Model Surfaces
- A. Casoli, M. Brendlé, J. Schultz, P. Auroy, G. Reiter. Tribology Lett. 8, 249-253 (2000)
- Real time determination of the slippage length in autophobic polymer dewetting
- G. Reiter, R. Khanna. Phys. Rev. Lett. 85, 2753-2756 (2000)
- Kinetics of Autophobic Dewetting of Polymer Films
- G. Reiter, R. Khanna. Langmuir 16, 6351-6357 (2000)
- Morphologies of Diblock Copolymer Thin Films Before and After Crystallization
- G. Reiter, G. Castelein, P. Hoerner, G. Riess, J.-U. Sommer, G. Floudas. Eur. Phys. J. E. 2, 319-334 (2000)
- Polymer Crystallization in Quasi-2 Dimensions: II. Kinetic Models and Computer Simulations
- J.-U. Sommer, G. Reiter. J. Chem. Phys. 112, 4384-4393 (2000)