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Neueste Veröffentlichungen
Baode Zhang, Snežana D. Zarić, Sonja S. Zrilić, Iosif Gofman, Barbara Heck, Günter Reiter. Communications Chemistry 8 (2025) 21
The interplay between attractive London dispersion forces and steric effects due to repulsive forces resulting from the Pauli principle often determines the geometry and stability of nanostructures. Aromatic polyimides (PI) and carbon nanotubes (CNT) were chosen as building blocks as two components in the hetero delocalized electron nanostructures. Two PIs, having the same diamine part and different linkage substituents between two phenyl rings of dianhydride part, one linked with ether bond (C-O-C) (OPI), the other with C-(CF3)2 (FPI), were investigated. Surprisingly, two CNT/PI nanocomposites show distinct failure mode from CNT yielding to CNT pull-out failure. Calculation of the interaction energy and chain conformations of each PI upon CNT was performed by accurate density functional theory (DFT) calculations and molecular dynamic simulation (MDS). (more...)
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...)
Liste der Veröffentlichungen
- Network stretching during tensile drawing of polyethylene: A study using X-ray scattering and microscopy
- Ke Hong, Gert Strobl. Macromulecules 39, 268-273 (2006)
- Temperature dependent variations in the lamellar structure of poly(L-lactide)
- Tai-Yon Cho, Gert Strobl. Polymer 47, 1036-1043 (2006)
- Viscous-force-dominated tensile deformation behavior of oriented polyethylene
- B. Na, Q. Zhang, Q. Fu, Y.F. Men, K. Hong, G. Strobl. Macromolecules 39, 2584-2591 (2006)
- Low-field NMR studies of polymer crystallization kinetics: changes in the melt dynamics
- C. Hertlein, K.Saalwächter, G. Strobl. Polymer 47, 7216 (2006)
- Crystallization and Melting of Bulk Polymers: New Observations, Conclusions and a Thermodynamic Scheme
- Gert Strobl. Prog. Polym. Sci. 31, 398 (2006)
- Time dependent light attenuation measurements used in studies of the kinetics of polymer crystallization
- Barbara Heck, Takahiko Kawai, Gert Strobl. Polymer 47, 5538-5543 (2006)
- 凝縮系物理学: 結晶からソフトマターへ
- G. ストローブル (著), 田口 健 (翻訳), 深尾 浩次 (翻訳). 出版社: シュプリンガー・ジャパン(株) 2006, ISBN 978-4431712206
- Variation of the Network Anisotropy of Cholesteric Side Chain Elastomers
- Christian Bourgerette, Bin Chen, Heino Finkelmann, Michel Mitov, Jürgen Schmidtke, Werner Stille. Macromolecules 39, 8163 (2006)
- Effects of comonomers on lamellar and noncrystalline microstructure of ethylene copolymers
- T.Y. Cho, E.J. Shin, W. Jeong, B. Heck, R. Graf, G. Strobl, H.W. Spiess, D.Y. Yoon. Macromolecular Rapid Communications 27, 322-327 (2006)
- Deriving Molecular Parameters of Interfaces Between Chemically Identical Polymers from Macroscopically Observed Phenomena
- Günter Reiter. Macromol. Symp. 229, 81–92 (2005)
- Structure Formation of Polystyrene-block-poly(gamma-benzyl L-glutamate) in Thin Films
- S. Ludwigs, G. Krausch, G. Reiter, M. Losik, M. Antonietti, H. Schlaad. Macromolecules 38, 7532 (2005)
- Residual stresses in thin polymer films cause rupture and dominate early stages of dewetting
- Günter Reiter, Moustafa Hamieh, Pascal Damman, Séverine Sclavons, Sylvain Gabriele, Thomas Vilmin, Elie Raphaël. Nature Materials 4, 754 (2005)
- Reply: Discussion of problems of non-equilibrium thermodynamics of polymers
- J.-U. Sommer and G. Reiter. Thermochimica Acta, 432, 153 (2005)
- Crystallization in Ultra-Thin Polymer Films/ Morphogenesis and Thermodynamical Aspects
- J.-U. Sommer and G. Reiter. Thermochimica Acta, 432, 135 (2005)
- Evolution of rim instabilities in the dewetting of slipping thin polymer films
- Günter Reiter. J. Adhesion 81, 381 (2005)
- Instability and droplet formation in evaporating thin films of a binary solution
- Leonid V. Govor, Jürgen Parisi, Gottfried H. Bauer and Günter Reiter. Phys. Rev. E 71, 051603 (2005)
- Morphology of an asymmetric ethyleneoxide-butadiene di-block copolymer in bulk and thin films
- D.M. Lambreva, R. Opitz, G. Reiter, P.M. Frederik and W.H. de Jeu. Polymer 46, 4868 (2005)
- Evolution of multilevel order in supramolecular assemblies
- F. Vonau, D. Suhr, D. Aubel, L. Bouteiller, G. Reiter and L. Simon. Phys. Rev. Lett. 94, 066103 (2005)
- Block formation during polymer crystallization
- T. Hippler, S. Jiang, G. Strobl. Macromolecules 38, 9396 (2005)
- Crystallization of a poly(ethylene-co-octene): I - A precursor structure and two competing mechanisms
- Andreas Häfele, Barbara Heck, Takahiko Kawai, Peter Kohn, Gert Strobl. Eur. Phys. J. E 16, 207-216 (2005)