Publications
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Recent Publications
Valentina Pirela, Leire Unanue, Justine Elgoyhen, Javier Ramos, Juan Francisco Vega, Agurtzane Mugica, Manuela Zubitur, Cuong Minh Quoc Le, Abraham Chemtob, Radmila Tomovska, Günter Reiter, Jaime Martín, Alejandro J. Müller. European Polymer Journal (2025) 113721
This work studies how the chemical structure of relatively similar high-sulfur alternating polythioether homopolymers (DMDS-alt-DVE, DMDS-alt-TEGDVE, and DMDS-alt-BDDVE) affects their structural properties, morphology, polymorphism, and crystallization kinetics. Differential scanning calorimetry (DSC) and polarized light optical microscopy (PLOM) experiments revealed a complex crystallization for the samples in which up to three different polymorphic phases were identified: a very low melting crystal form (VL-Tm form), a low melting crystal form (L-Tm form) and a high melting crystal form (H-Tm form), characterized by their corresponding melting temperature ranges and confirmed via Wide-Angle X-ray Scattering (WAXS). A coexistence of negative and positive spherulites was found, and their origin was revealed by atomic force microscopy (AFM), which showed how the lamellar arrangement varied in the samples from predominantly radial to a cross-hatched morphology. (more...)
Gabriele Greco, Benjamin Schmuck, Fredrik G. Bäcklund, Günter Reiter and Anna Rising. ACS Appl. Polym. Mater. 6 (2024) 14342–14350
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...)
List of Publications
- 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)
- Model of Partial Crystallization and Melting Derived from Small-Angle X-Ray-Scattering and Electron-Microscopic Studies on Low-Density Polyethylene
- G.R. Strobl, M.J. Schneider, I.G. Voigt-Martin. J. Polym. Sci. B - Polymer Physics 18, 1361-1381 (1980)
- Direct Evaluation of the Electron Density Correlation Function of Partially Crystalline Polymers
- G.R. Strobl, M. Schneider. J. Polym. Sci. B - Polymer Physics 18, 1343-1359 (1980)
- Analysis of the Intensities of the Longitudinal Acoustic Vibtrations in n-Alkanes and Polyethylene
- G.R. Strobl, R. Eckel. Coll. Polym. Sci. 258, 570-577 (1980)
- Phase-Transitions in Crystals of Chain Molecules. Relation between Defect Structures and Molecular Motion in the four Modifications of n-C33H68
- B. Ewen, G.R. Strobl, D. Richter. Faraday Discussions 69, 19-31 (1980)
- Molecular Orientational Correlations and Local Order in n-Alkane Liquids
- E.W. Fischer, G.R. Strobl, M. Dettenmaier, M. Stamm, N. Steidle. Faraday Discussions 68, 26-45 (1979)
- Einige polymerspezifische Anwendungen der Schwingungsspektroskopie
- G.R. Strobl. Coll. Polym. Sci. 257, 584-590 (1979)
- Circular Fluorescence Polarization of Achiral Molecules in Cholesteric Liquid Crystals
- H. Stegemeyer, W. Stille and P. Pollmann. Israel J. Chem. 18, 312 (1979)
- Molekulare Deutung der Umwandlungswärmen bei den Modifikationsübergängen des n-Tritriacontans
- G.R. Strobl. Coll. Polym. Sci. 256, 427-445 (1978)
- Raman Spectroscopic Method for Determining Crystallinity of Polyethylene
- G.R. Strobl, W. Hagedorn. J. Polym. Sci. Part B - Polymer Physics 16, 1181-1193 (1978)
- Molecular-Motion, Thermal-Expansion, and the Phase-Transitions in Paraffins: A Model for Polymers
- G.R. Strobl. J. Polym. Sci. Part C - Polymer Symposium 59, 121-142 (1977)
- Die molekularen Grundlagen der anisotropen thermischen Ausdehnung von Paraffinen und Polyäthylen. Eine ramanspektroskopische Untersuchung am Beispiel des N-Tritriacontans
- G.R. Strobl. Coll. Polym. Sci. 254, 170-189 (1976)
- Packing of Paraffin Chains in 4 Stable Modifications of n-Tritriacontane
- W. Piesczek, G.R. Strobl, K. Malzahn. Acta Cryst. B 30, 1278 (1974)
- Defect Structure and Molecular-Motion in 4 Modifications of Normal-Tritriacontane. 2. Study of Molecular-Motion Using Infrared Spectroscopy and Wide-Line Nuclear Magnetic-Resonance Measurements
- B. Ewen, E.W. Fischer, W. Pieszek, G. Strobl. J. Chem. Phys. 61, 5265-5272 (1974)
- Defect Structure and Molecular-Motion in 4 Modifications of Normal-Tritriacontane. 1. Study of Defect Structure in Lamellar Interfaces Using Small-Angle X-Ray-Scattering
- G. Strobl, B. Ewen, E.W. Fischer, W. Piesczek. J. Chem. Phys. 61, 5257-5264 (1974)
- An exactly solvable model for coherent and incoherent exciton motion
- H. Haken and G. Strobl. Zeitschrift für Physik 262, 135-148 (1973)
- Small-angle x-ray scattering experiments for investigating the validity of the two-phase model
- G.R. Strobl, N. Müller. Journal of Polymer Science B - Polymer Physics 11, 1219-1233 (1973)
- Determination of Lamellar Structure of Partially Crystalline Polymers by Direct Analysis of their Small-Angle X-Ray-Scattering Curves
- G.R. Strobl. Journal of Applied Crystallography 6, 365-370 (1973)
- Synthese und Eigenschaften molekulareinheitlicher n-Paraffine bis zum C140H282
- W. Heitz, E.W. Fischer, R. Peters, T. Wirth, G. Strobl. Makromolekulare Chemie 162, 63 (1972)
- Analyse von spaltverschmierten Kleinwinkelstreukurven lamellarer Strukturen
- G.R. Strobl. Kolloid-Zeitschrift and Zeitschrift für Polymere 250, 1039-1046 (1972)