Preparation of Various Ring Macromolecules and Their Peculiar Properties in Comparison with Linear Counterparts
Jeudi 12 septembre 2019 11:00
- Duree : 1 heure
Lieu : ILL4, seminar room, first floor - 71 avenue des Martyrs - Grenoble
Orateur : Yushu MATSUSHITA (Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, agoya University, Furo-cho, Chikusa-ku Nagoya 464-8603 Japan)
Several interesting results on ring macromolecules are presented. The simplest ring polystyrenes, i.e., trivial rings, with different molecular weight were synthesized by anionic polymerizations and they were purified by SEC(size exclusion chromatography) separation followed by an LCCC(liquid chromatography at the critical condition) method so as to give samples with ultra-high purities. Their chain dimensions in bulk and in semi-dilute solutions were measured by SANS and they were confirmed to show peculiar rheological properties in comparison with linear counterparts. Viscoelastic properties of decorated ring molecules : tadpole-shaped and dumbbell-shaped ring molecules, are also discussed. Ring polyisoprene was also prepared to study the topological effects on the miscibility of polymer blends with poly(trimethyl-silylstyrene)(PTMSS). It turned out to be clear that the miscibility is lower for ring-ring blend than those for ring-linear and linear-linear blends, reflecting the less-entangled structural feature of ring molecules.
Contact : tellier@ill.fr
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