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Neueste Veröffentlichungen
Raphael Hertel, Maximilian Raisch, Michael Walter, Günter Reiter, Michael Sommer. Angew. Chem. Int. Ed. 2024, e202409369
Sterically distorted donor-acceptor p‑systems, termed DA springs, can be progressively planarized under mechanical load causing a bathochromic shift of the photoluminescence (PL) spectrum. By combining theory and experiment, we here use a simple linear force calibration for two different conformational mechanochromophores to determine molecular forces in polymers from the mechanochromic shift in PL wavelength during multiple uniaxial tensile tests. Two systems are used, i) a highly entangled linear glassy polyphenylene and ii) a covalent elastomeric polydimethylsiloxane network. The mean forces estimated by this method are validated using known threshold forces for the mechanochemical ring-opening reactions of two different spiropyran force probes. The agreement between both approaches underlines that these DA springs provide the unique opportunity for the online monitoring of local molecular forces present in diverse polymer matrices.(more...)
"Printing" on Polymer Single Crystals through Microregional Heating
Tianyu Wu, Haimu Ye, Xinyi Pan, Yaning He, Jun Xu, Günter Reiter. ACS Appl. Polym. Mater. 2024, 6, 14, 7969–7977
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...)
Liste der Veröffentlichungen
- Polymer Crystallization on Pre-patterned Substrates
- G. Dorenbos, J.-U. Sommer, G. Reiter. J. Chem. Phys. 118, 784-791 (2003)
- Thermodynamics of Formation, Reorganization and Melting of Confined Nanometer-sized Polymer Crystals
- Andreas Röttele,Thomas Thurn-Albrecht, Jens-Uwe Sommer, Günter Reiter. Macromolecules 36, 1257-1260 (2003)
- Outlook and open questions: A personal view
- Günter Reiter and Jens-Uwe Sommer. In Lecture Notes in Physics: "Polymer Crystallization: Observations, Concepts and Interpretations". Eds. Jens-Uwe Sommer and Günter Reiter, p.378-382, 2003
- A Generic Model for Growth and Morphogenesis of Polymer Crystals in Two Dimensions
- Jens-Uwe Sommer and Günter Reiter. In Lecture Notes in Physics: "Polymer Crystallization: Observations, Concepts and Interpretations". Eds. Jens-Uwe Sommer and Günter Reiter, p.153-176, 2003
- Crystallization of Polymers in Thin Films: Model experiments
- Günter Reiter, Gilles Castelein and Jens-Uwe Sommer. In Lecture Notes in Physics: "Polymer Crystallization: Observations, Concepts and Interpretations". Eds. Jens-Uwe Sommer and Günter Reiter, p.131-152, 2003
- Polymer Crystallization: Obervations, Concepts and Interpretations
- Editors: Jens-Uwe Sommer and Günter Reiter. Lecture Notes in Physics 606 (2003), Springer Berlin/Heidelberg, ISSN 1616-6361
- Dewetting of thin polymer films at temperatures close to the glass transition
- G. Reiter, M. Sferrazza, P. Damman. Eur. Phys. J. E 12, 133–138 (2003)
- Editorial on "Focus point": Unstable thin films
- A.M. Donald, J.F. Joanny,M. Moller,G. Reiter. Eur. Phys. J. E 12, 359-360 (2003)
- Crystal growth rates of diblock copolymers in thin films: Influence of film thickness
- G.Reiter, L.Vidal. Eur. Phys. J. E 12, 497-505 (2003)
- Self-destruction and dewetting of thin polymer films: the role of interfacial tensions
- G. Reiter, R. Khanna, A. Sharma. J. Phys. Condensed Matter 15 (2003) S331-S336
- Crystallization of s-polypropylene from the glassy state: Indications for a multistage process
- M. Grasruck, G. Strobl. Macromolecules 36, 86-91 (2003)
- A molar mass induced transition in the yielding properties of linear polyethylene
- Qiang Fu, Yongfeng Men, Gert Strobl. Polymer 44, 1941-1947 (2003)
- Understanding of the tensile deformation in HDPE/LDPE blends based on their crystal structure and phase morphology
- Qiang Fu, Yongfeng Men, Gert Strobl. Polymer 44, 1927-1933 (2003)
- Critical strains in poly(epsilon-caprolactone) and blends with poly(vinyl methyl ether) and poly(styrene-co-acrylonitrile)
- Yongfeng Men, Gert Strobl. Macromolcules 36, 1889-1898 (2003)
- On the mechanisms of recrystallization after melting in semicrystalline polymers: The effect of the initial melt state
- M. Al-Hussein, G. Strobl. Journal of Macromolecular Science - Physics B42, 677-685 (2003)
- Fluorescence of a dye-doped cholesteric liquid crystal film in the region of the stop band: theory and experiment
- J. Schmidtke and W. Stille. Eur. Phys. J. B 31, 179 (2003)
- Investigating polymer crystallization by time-dependent light scattering: a direct approach in the data analysis applied for s-polypropylene
- Anke Hoffmann, Gert Strobl. Polymer 44, 5803-5809 (2003)
- Defect Mode Emission of a Dye Doped Cholesteric Polymer Network
- J. Schmidtke, W. Stille, H. Finkelmann. Phys. Rev. Lett. 90, 083902 (2003)
- Condensed Matter Physics: Crystals, Liquids, Liquid Crystals, and Polymers
- Gert Strobl. Springer 2003, ISBN 978-3540003533
- Role of the entangled amorphous network in tensile deformation of semicrystalline polymers
- Y. F. Men, J. Rieger, G. Strobl. Physical Review Letters 91, 095502 (2003)