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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
- Interdiffusion in the Partially Miscible Polymer Blend of Deuterated Polystyrene and Poly(styrene-co-bromostyrene)
- F. Bruder, R. Brenn, B. Stühn, G.R. Strobl. Macromolecules 22, 4434-4437 (1989)
- Structure Relaxation after Temperature Jumps in Homogeneous Polystyrene Poly(styrene-co-bromostyrene) Blends
- G.R. Strobl, G. Urban. Colloid and Polymer Science 266, 398-404 (1988)
- Soliton dynamics and impurities in the Pariser-Parr-Pople model of alternating trans-polyacetylen
- R. Markus, W. Förner, J. Ladik. Solid States Communications 68, 135-138 (1988)
- Investigations on Low Temperature Transitions and Time Effects of Branched Polyethylene by the Positron Lifetime Technique
- P. Kindl, G. Reiter. phys. stat. sol. (a) 104, 707 (1987)
- Small-Angle X-Ray-Scattering Study of Spinodal Decomposition in Polystyrene Poly(styrene-co-bromostyrene) Blends
- H. Meier, G.R. Strobl. Macromolecules 20, 649-654 (1987)
- Surface Melting in Melt-Crystallized Linear Polyethylene
- Y. Tanabe, G.R. Strobl, E.W. Fischer. Polymer 27, 1147-1153 (1986)
- Thermally Reversible Phase Separation in Polystyrene Poly(styrene-co-4-bromostyrene) Blends
- G.R. Strobl, J.T. Bendler, R.P. Kampour, A.R. Shultz. Macromolecules 19, 2683-2689 (1986)
- Structure Evolution during Spinodal Decomposition of Polymer Blends
- G.R. Strobl. Macromolecules 18, 558-563 (1985)
- Dielectric Relaxation of Liquid Crystalline Polyacrylates and Polymethacrylates
- R. Zentel, G.R. Strobl, H. Ringsdorf. Macromolecules 18, 960-965 (1985)
- Structures of Liquid Crystalline Side Group Polymers Oriented by Drawing
- R. Zentel, G.R. Strobl. Makromolekulare Chemie - Macromolecular Chemistry and Physics 185, 2669-2676 (1984)
- Molecular-Motion, Defect Structures and Phase-Transitions in Oligomer Crystals
- G.R. Strobl, H. Schwickert, T. Trzebiatowski. Berichte der Bunsen-Gesellschaft - Physical Chemistry Chemical Physics 87, 274-279 (1983)
- Crystallization and Melting of Fractions of Branched Polyethylene. 2. Dilatometric and Small-Angle X-Ray-Scattering Study on the Molecular Weight Dependence of Isothermal Crystallization
- E. Maderek, G.R. Strobl. Coll. Polym. Sci. 261, 471-476 (1983)
- Effect of Amorphous Sequences on the Longitudinal Acoustic Modes in Partially Crystalline Polymers. 1. Transfer Matrix Method
- G.R. Strobl. J. Polym. Sci. B - Polymer Physics 21, 1357-1380 (1983)
- On the Kinetics of Isothermal Crystallization of Branched Polyethylene
- G.R. Strobl, T. Engelke, E. Madarek, G. Urban. Polymer 24, 1585-1589 (1983)
- Kristallisation und Schmelzverhalten von Fraktionen verzweigten Polyethylens. 1. Darstellung und Charakterisierung der Fraktionen
- Eugeniusz Maderek, Gert R. Strobl. Makromolekulare Chemie - Macromolecular Chemistry and Physics 184, 2553-2561 (1983)
- Raman Spectrum of the High Pressure Phase of Polyethylene
- R. Eckel, H. Schwickert, M. Buback, G.R. Strobl. Polymer Bulletin 6, 559-564 (1982)
- Die Kristallstruktur von Cycloalkanen
- Thomas Trzebiatowski, Martin Dräger, Gert R. Strobl. Makromolekulare Chemie - Macromolecular Chemistry and Physics 183, 731-744 (1982)
- Zum Mechanismus der Polymerkristallisation
- G. R. Strobl, T. Engelke, H. Meier, G. Urban. Coll. Polym. Sci. 260, 394-403 (1982)
- Pressure induced changes in the Raman spectra of liquid n-alkanes and perfluoro-n-alkanes
- H. Schwickert, G. R. Strobl and R. Eckel. Coll. Polym. Sci. 260, 588-593 (1982)
- Untersuchung der druckinduzierten Kristallisation von Polyäthylen mit Hilfe einer neuen Raman-Hochdruckzelle
- R. Eckel, M. Buback und G. R. Strobl. Coll. Polym. Sci. 259, 326-334 (1981)