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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
- Exploring pathways to equilibrate Langmuir polymer films
- Abhijna Das, Sebastian Noack, Helmut Schlaad, Günter Reiter, Renate Reiter. Langmuir 36 (2020) 8184–8192
- Energy transport and light propagation mechanisms in organic single crystals
- Bernd Wittmann, Stephan Wiesneth, Sajedeh Motamen, Laurent Simon, Françoise Serein-Spirau, Günter Reiter, and Richard Hildner. Journal of Chemical Physics 153 (2020) 144202
- Large quantum efficiency enhancements of pristine conjugated polymer MEH-PPV by interlayer polymer diffusion
- Po-Tsun Chen, Ya-Wei Yang, Günter Reiter, Arnold C.-M. Yang. Polymer 204 (2020) 122753
- Formation of Needle-like Poly(3-hexylthiophene) Crystals from Metastable Solutions
- Tianyu Wu, Thomas Pfohl, Sivasurender Chandran, Michael Sommer and Günter Reiter. Macromolecules 53 (2020) 8303–8312
- Rheological Properties of Blends of Isotactic Polystyrene–Isotactic Poly(para-methylstyrene) Films Derived from a Comparative Dewetting Study
- Austine Amukayia Mulama, Konstantinos Roumpos, Pradipkanti Lairenjam, Andrew Oduor, Günter Reiter. Macromolecules 53 (2020) 9122–9130
- Dewetting-Induced Alignment and Ordering of Cylindrical Mesophases in Thin Block Copolymer Films
- Heng Zhang, Binghua Wang, Gang Wang, Changyu Shen, Jingbo Chen, Günter Reiter, Bin Zhang. Macromolecules 53, (2020) 9631–9640
- Estimation of the Size of Critical Secondary Nuclei of Melt-Grown Poly(l-lactide) Lamellar Crystals
- Shujing Zhang, Baohua Guo, Günter Reiter, Jun Xu. Macromolecules 53 (2020) 3482–3492
- Translating molecular relaxations in non-equilibrated polymer melts into lifting macroscopic loads
- Farzad Ramezani, Jörg Baschnagel, and Günter Reiter. Phys. Rev. Materials 4 (2020) 082601
- A new growth process for crystalline ultra-thin layers of conjugated oligomers used in field-effect transistor applications
- Sven Renkert, Sadiara Fall, Sajedeh Motamen, Thibaut Jarrosson, Françoise Serein-Spirau, Thomas Heiser, Laurent Simon, Günter Reiter, Jean-Luc Bubendorff. Applied Surface Science 539 (2021) 148024
- The memorizing capacity of polymers
- Günter Reiter. J. Chem. Phys. 152, 150901 (2020)
- Formation of asymmetric leaf-shaped crystals in ultrathin films of oriented polyethylene molecules resulting from high-temperature relaxation and recrystallization
- Huihui Li, Duanzijing Liu, Xinyun Bu, Zhenzhen Zhou, Zhongjie Ren, Xiaoli Sun, Renate Reiter, Shouke Yan, Günter Reiter. Macromolecules 53 (2020) 346-354
- Controlling phase transitions in Langmuir polymer films
- Abhijna Das. Inauguraldissertation der Fakultät für Mathematik und Physik 2020. DOI: 10.6094/UNIFR/167266
- Controlling Nucleation in Quasi-Two-Dimensional Langmuir Poly(L-lactide) Films through Variation of the Rate of Compression
- Abhijna Das, Ahmed S. El-Tawargy, Emna Khechine, Sebastian Noack, Helmut Schlaad, Günter Reiter, and Renate Reiter. Langmuir 35 (2019) 6129-6136
- Activity of the Gramicidin A Ion Channel in a Lipid Membrane with Switchable Physical Properties
- Renate Reiter, Ekaterina Zaitseva, Gerhard Baaken, Ibrahim Halimeh, Jan C. Behrends, Andreas Zumbuehl. Langmuir 35 (2019) 14959-14966
- Dewetting Rheology for Determining Viscoelastic Properties of Non-equilibrated Thin Polymer Films
- Austine A. Mulama, Sivasurender Chandran, Konstantinos Roumpos, Andrew O. Oduor, and Günter Reiter. Macromolecules 52 (2019) 7894-7903
- Relation between Charge Transport and the Number of Interconnected Lamellar Poly(3-hexylthiophene) Crystals
- Binghua Wang, Jingbo Chen, Changyu Shen, Günter Reiter, Bin Zhang. Macromolecules 52 (2019) 6088-6096
- Fully Isotactic Poly(p-methylstyrene): Precise Synthesis via Catalytic Polymerization and Crystallization Studies
- Tianyu Wu, Luis Valencia, Thomas Pfohl, Barbara Heck, Günter Reiter, Pierre Lutz, Rolf Mülhaupt. Macromolecules 52 (2019) 4839-4846
- Photoelectronic properties of composite films based on conductive polymer PIDT-BT and single-walled carbon nanotubes
- Andrey N. Aleshin, Baode Zhang, Petr A. Aleshin, Vasily N. Petrov, Irina N. Trapeznikova, Günter Reiter, Janis Kleperis. SN Applied Sciences 1 (2019) 1101
- Segmental Rearrangements Relax Stresses in Nonequilibrated Polymer Films
- Sivasurender Chandran, Günter Reiter. ACS Macro Letters, 8, 646, (2019)
- Thermodynamic Features of Perfectly Crystalline Poly(3-Hexylthiophene) Based on Flory’s Relation
- Mina Alizadehaghdam, Silvia Siegenführ, Farhang Abbasi, and Günter Reiter. Journal of Polymer Science Part B: Polymer Physics 57, 431–437 (2019)