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Neueste Veröffentlichungen
"Printing" on Polymer Single Crystals through Microregional Heating
Tianyu Wu, Haimu Ye, Xinyi Pan, Yaning He, Jun Xu, Günter Reiter. ACS Appl. Polym. Mater. published online.
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...)
Mina Alizadehaghdam, Farhang Abbasi, Günter Reiter. J. Phys. Chem. C 128 (2024) 4757–4765
Crystallization of poly(3-hexylthiophene) (P3HT) was studied in mixtures of different concentrations of 3-hexylthiophene (3HT) as a diluent. Two coexisting crystal populations, socalled “thin” and “thick” crystals, with melting temperatures differing by more than 10 °C were observed in these mixtures. Intriguingly, the “thick” crystals represented transient unstable structures, with a mass fraction that was the highest ФH for rapidly crystallized P3HT in presence of significant amount of diluent. Reflecting its dependence on growth kinetics, ФH decreased with increasing crystallization temperature, extended crystallization time or lower cooling rate. The presence of a diluent led to a “depression” of the melting temperature, described by Raoult’s law and the Flory equation, which was similar for P3HT samples crystallized in various ways. (more...)
Liste der Veröffentlichungen
- X-ray and Neutron Reflectometry for the Investigation of Polymer Diffusion
- G. Reiter, S. Hüttenbach, M. Foster, M. Stamm. Fresenius J. Anal. Chem. 341, 284-288 (1991)
- Molecular-Dynamics in Perfluoro-n-Eicosane. 3. Oscillatory and Diffusive Translational Motion
- T. Albrecht, R. Jäger, W. Petry, R. Steiner, G. Strobl, B. Stühn. Journal of Chemical Physics 95, 2817-2822 (1991)
- Molecular-Dynamics in Perfluoro-n-Eicosane. 2. Components of Disorder
- T. Albrecht, H. Elben, R. Jäger, M. Kimmig, R. Steiner, G. Strobl, B. Stühn, H. Schwickert, C. Ritter. Journal of Chemical Physics 95, 2807-2816 (1991)
- Molecular-Dynamics in Perfluoro-n-Eicosane. 1. Solid-Phase Behavior and Crystal-Structures
- H. Schwickert, G. Strobl, M. Kimmig. Journal of Chemical Physics 95, 2800-2806 (1991)
- Mesogenic 4-Methoxyphenyl 4-Hexyloxybenzoate
- W. Haase, H. Paulus, G. Strobl, W. Hotz. Acta Crystallographica C, Crystal Structure Communications 47, 2005-2006 (1991)
- Ellipsometric characterisation of Langmuir monolayer of “hairy-rod” polymeres at the air-water interface
- H. Motschmann, R. Reiter, R. Lawall, G. Duda, M. Stamm, G. Wegner, W. Knoll. Langmuir 7, 2743-2747 (1991)
- Comparative Study of Individual and Collective Rotational Motion in Mixtures of Liquid Crystalline Side Group Polymers and Low Molecular Weight Mesogens
- H. Seiberle, W. Stille and G. Strobl. Macromolecules 23, 2008 (1990)
- Interdiffusion of Polymer Thin Films as Determined by Scattering Techniques
- M. Stamm, D. Brautmeier, G. Reiter, M. Foster. Proceed. of the 48th ANTEC 1990 Dallas, USA on "Plastics in the Environment: Yesterday, Today and Tomorrow" 36, 825 (1990)
- Characterisation of Polymer Surfaces and Interfaces by Reflectivity and Interference Techniques
- M. Stamm, G. Reiter, M. Foster, H. Motschmann, S.Hüttenbach, C. Toprakcioglu. Sci. and Eng., ACS/PMSE 62, 843 (1990)
- Interfacial Mixing of Polymers as Investigated by X-ray and Neutron Reflectometry
- M. Stamm, G. Reiter, S. Hüttenbach, M. Foster. ACS Polymer preprints 31, 73 (1990)
- X-ray Reflectometer for Study of Polymer Thin Films and Interfaces
- M. Foster, M. Stamm, G. Reiter, S. Hüttenbach. Vacuum, 41, 1441-1444 (1990)
- Positron Lifetime Investigations on Linear Polyethylene Compared to Branched Polyethylene
- G. Reiter, P. Kindl. phys. stat. sol. (a) 118, 161-168 (1990)
- Concentration-Dependence of the Flory-Huggins Interaction Parameter of a Polymer Blend as Determined by Small-Angle X-Ray-Scattering Experiments
- T. Koch, G.R. Strobl. Journal of Polymer Science B - Polymer Physics 28, 343-353 (1990)
- Positron Lifetime Investigations on Polymethylmethacrylate
- P. Kindl, G. Reiter. In: Positron Annihilation, Ed. L. Dorikens-Vanpraet, M. Dorikens, and D. Segers, World Scientific, Singapore 1989 (p.806)
- A Neutron Reflectometer for the Investigation of Solid and Liquid Interfaces
- M. Stamm, G. Reiter, S. Hüttenbach. Physica B 156, 564-566 (1989)
- Kinetics of Relaxation and Unmixing in Polymer Blends as Studied by X-Ray-Scattering
- G. Strobl. Makromolekulare Chemie - Macromolecular Symposia 26, 413-429 (1989)
- X-Ray-Scattering Study of Molecular Order in a Liquid Crystal-Side Group Polysiloxane
- W. Hotz, G. Strobl. Colloid and Polymer Science 267, 889-898 (1989)
- 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)