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Neueste Veröffentlichungen
Gabriele Greco, Benjamin Schmuck, Fredrik G. Bäcklund, Günter Reiter and Anna Rising. ACS Applied Polymer Materials, published online
Recent biotechnological advancements in protein production and development of biomimetic spinning procedures make artificial spider silk a promising alternative to petroleum-based fibers. To enhance the competitiveness of artificial silk in terms of mechanical properties, refining the spinning techniques is imperative. One potential strategy involves the integration of post-spin stretching, known to improve fiber strength and stiffness while potentially offering additional advantages. Here, we demonstrate that post-spin stretching not only enhances the mechanical properties of artificial silk fibers but also restores a higher and more uniform alignment of the protein chains, leading to a higher fiber toughness. (more...)
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
- Morphogenesis of lamellar polymer crystals
- J.-U. Sommer, G. Reiter. Europhys. Lett. 56, 755 (2001)
- Dewetting of highly elastic thin polymer films
- Günter Reiter. Phys. Rev. Lett. 87, 186101 (2001)
- Spincast, thin, glassy polymer films: highly metastable forms of matter
- G. Reiter, P. G. de Gennes. Eur. Phys. J. E 6, 25-28 (2001)
- 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)