Publications
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Recent Publications
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...)
List of Publications
- Morphogenesis and non-equilibrium pattern formation in two-dimensional polymer crystallization
- Jens-Uwe Sommer and Günter Reiter. Phase Transition 77, 703-745 (2004)
- Nanoparticle ring formation in evaporating micron-size droplets
- Leonid V. Govor, Günter Reiter, Gottfried H. Bauer, Jürgen Parisi. Appl. Phys. Lett. 84, 4774-4776 (2004)
- Self-assembled nanoparticle deposits formed at the contact line of evaporating micrometer-size droplets
- Leonid V. Govor, Günter Reiter, Jürgen Parisi, and Gottfried H. Bauer. Phys. Rev. E 69, 061609 (2004)
- Biocide squirting from an elastomeric tri-layer film
- Philippe Sonntag, Pierre Hoerner, André Chemoyl, Gilles Argy, Gérard Riess, Günter Reiter. Nature Materials 3, 311-315 (2004)
- Controlled melting of individual, nano-meter-sized, polymer crystals confined in a block copolymer mesostructure
- Cvetelin Vasilev, Harry Heinzelmann, Günter Reiter. Journal of Polymer Science Part B: Polymer Physics Volume 42, 1312 – 1320 (2004)
- Crystallization mechanism of syndiotactic polypropylene analyzed by time-dependent light scattering
- T. Kawai, G. Strobl. Macromolecules 37, 2249-2255 (2004)
- The stress relaxation behavior of isotactic poly(1-butene) and its ethylene copolymers
- M. Al-Hussein M, G. Strobl. Journal of Polymer Science, Part B Polymer Physics 42, 2074-2080 (2004)
- Continuous changes in the inner order of the crystalline lamellae during isothermal crystallization of poly(is an element of-caprolactone)
- Kohn P, Strobl G. Macromolucules 37, 6823-6826 (2004)
- Interplay between domain microstructure and nematic order in liquid crystalline/isotropic block copolymers
- R. Ivanova, R. Staneva, S. Geppert, B. Heck, B. Walter, W. Gronski, B. Stühn. Coll. Polym. Science 282, 810-824 (2004)
- Nematic and Smectic Surface Order in the Isotropic-Phase of Low Molar-Mass and Polymeric Liquid-Crystals
- S. Immerschitt, H. Elben, H. Holthoff, G. Strobl. Berichte der Bunsen-Gesellschaft - Physical Chemistry Chemical Physics 98, 376-382 (1994)
- Model treatment of tensile deformation of semicrystalline polymers: Static elastic moduli and creep parameters derived for a sample of polyethylene
- Ke Hong, Ankur Rastogi, Gert Strobl. Macromolecules 37, 10174-10179 (2004)
- Equations describing lamellar structure parameters and melting points of polyethylene-co-(butene/octene)s
- Tai-Yon Cho, Barbara Heck, Gert Strobl. Coll. Polym. Science 282, 825-832 (2004)
- A model treating tensile deformation of semi-crystalline polymers: Quasi-static stress-strain relationship and viscous stress determined for a sample of polyethylene
- K. Hong, A. Rastogi and G. Strobl. Macromolecules 37, 10165 (2004)
- Crystallization of s-polypropylene: a qualitative change in the kinetics induced by the temperature of the melt
- Barbara Heck, Gert Strobl. Coll. Polym. Science 282, 511-513 (2004)
- Summary and conclusions: Progress in our understanding of instabilities in thin films
- G. Reiter. Eur. Phys. J. E, 12, 465 –468 (2003)
- Self-Assembly of CoPt3 Nanoparticle Rings Based on Phase-Separated Hexadecylamine Droplet Structure
- Leonid V. Govor, Gottfried H. Bauer, Günter Reiter, Elena Shevchenko, Horst Weller, Jürgen Parisi. Langmuir 19, 9573-9576 (2003)
- Dewetting near the Glass Transition: Transition from a Capillary Force Dominated to a Dissipation Dominated Regime
- Pascal Damman, Nancy Baudelet, Günter Reiter Phys. Rev. Lett. 91, 216101 (2003)
- Model Experiments for a Molecular Understanding of Polymer Crystallization
- G. Reiter. J. Polym. Sci. Part B Polym. Phys. 41, 1869-1877 (2003)
- Chances and Challenges in Europe
- G. Reiter, N. Hadjichristidis, M. Möller. Nature Materials 2, 67-69 (2003)
- Effet autophobe et démouillage des couches minces de polymères
- G. Reiter. L’Actualité Chimique, Janvier 2003, p. 12-17