Publications
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Recent Publications
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...)
List of Publications
- Connectors in Adhesion and Contact Angle Hysteresis
- G. Reiter, A. Casoli, A. Sharma, P. Auroy. Dans les actes de JADH'97: 9émes Journées d'Etudes sur l'Adhesion, Sept. 1997 in St. Lary/F, Edition SFV, Paris 1997, p. 68-73
- Large-scale heterogeneities in entangled polymer solutions. Light-scattering study on polystyrene in toluene
- M. Heckmeier, M. Mix, G. Strobl. Macromolecules 30, 4454-4458 (1997)
- A four-state scheme for treating polymer crystallization and melting suggested by calorimetric and small angle X-ray scattering experiments on syndiotactic polypropylene
- J. Schmidtke, G. Strobl, T. ThurnAlbrecht. Macromolecules 30, 5804-5821 (1997)
- The Effect of Dissolved Side-Group Polymers on Pattern Dynamics in Nematic Liquid Crystals in a Rotating Magnetic Field
- E.E. Pashkovsky, W. Stille, G. Strobl and D. Talebi. J. Phys. II France 7 (1997) 707-727
- Structural transition in a nematic LC block copolymer induced by the transition to the LC phase
- J. Sänger, W. Gronski, S. Maas, B. Stühn, B. Heck. Macromolecules 30, 6783-6787 (1997)
- A new approach to polymer crystallization used in an analysis of data of syndiotactic polypropylene
- Gert Strobl. Acta Polymerica 48, 562-570 (1997)
- Director field patterns of nematic polymer solutions at asynchronous rotation in a magnetic field
- E. Pashkovsky, W. Stille, G. Strobl and D. Talebi. Mol. Cryst. Liq. Cryst. 302, 403 (1997)
- SAXS and TEM studies on poly(styrene)-block-poly(ethene-co-but-1-ene)-block-poly(styrene) in bulk and at various interfaces
- B. Heck, P. Arends, M. Ganter, J. Kressler, B. Stühn. Macromolecules 30, 4559-4566 (1997)
- Improving Adhesion via Connector Polymers to Stabilize Non-wetting Liquid Films
- G. Reiter, J. Schultz, P. Auroy, L. Auvray. Europhys. Lett. 33, 29 (1996)
- Instabilities of Thin Polymer Films on Layers of Chemically Identical Grafted Molecules
- G. Reiter, P. Auroy, L. Auvray. Macromolecules 29, 2150 (1996)
- The Effect of Adhesion on the Rheological and Frictional Behavior of a Confined Lubricant Film
- G. Reiter. J. Adhesion 57, 55 (1996)
- Instability of Thin Polymer Films on Coated Substrates: Rupture, Dewetting and Drop Formation
- A. Sharma, G. Reiter. J. Coll. Interf. Sci. 178, 383 (1996)
- Glass transition in ethylene-vinylacetate copolymers analyzed by combined dielectric and X-ray scattering experiments
- Bernd Holzer, Gert Strobl. Acta Polymerica 47, 40-47 (1996)
- Observation of the early stages of crystallization in polyethylene by time-dependent SAXS: Transition from individual crystals to stacks of lamellae
- T. Albrecht, G. Strobl. Macromolecules 29, 783-785 (1996)
- Autophobic Behavior of Polymers at Interfaces
- G. Reiter, P. Auroy, L. Auvray. Proceedings of the Moriond 95 Workshop, in: Moriond Condensed Matter Physics: “Short and Long Chains at Interfaces”, eds. J. Daillant, P. Guenoun, C. Marques, P. Muller, J. Trân Thanh Vân, p. 57-66
- The Solid-like State of a Confined Liquid Lubricant: Deformation and Time Effects
- G. Reiter, A. L. Demirel, J. Peanasky, L. Cai, S. Granick. Proceedings of the NATO Workshop on “The Physics of Sliding Friction” at Trieste/Italy, 1995,. Eds. B.N.J. Persson, E. Tosatti, NATO ASI Serie E, 311, 119-128 (1996)
- What Determines Static Friction and Controls the Transition to Sliding
- G. Reiter, A. L. Demirel, J. Peanasky, L. Cai, S. Granick. Tribology Lett. 1, 1 (1995)
- Temperature-Dependent Crystalline-Amorphous Structures in Isotactic Polypropylene - Small-Angle X-Ray-Scattering Analysis of Edge-Bounded 2-Phase Systems
- T. Albrecht, G. Strobl. Macromolecules 28, 5267-5273 (1995)
- Periodic Pattern Formation in Side-Group Polymer Nematic Solutions at the Twist Frederiks Transition
- E. E. Pashkovsky, W. Stille and G. Strobl. J. Phys. II France 5, 397 (1995)
- Temperature-Dependent Crystalline-Amorphous Structures in Linear Polyethylene - Surface Melting and the Thickness of the Amorphous Layers
- T. Albrecht, G. Strobl. Macromolecules 28, 5827-5833 (1995)