慶應義塾大学 · 材料科学
Hotta教授の研究室では、高分子の構造と相挙動の制御を核に、結晶性ブロックコポリマーと熱可塑性エラストマーの設計・合成・物性評価を進めています。特に、立体規則性を制御したポリプロピレンを用いた三重ブロックコポリマーの合成と、その微相分離構造と機械的性質の関係を解明しています。また、液晶性エラストマーにおけるスローリラックス挙動や時間温度同等性の応用にも注力しており、高分子材料の応用的性質の理解を深めています。
Figures are computed from collected data and may differ slightly.
We report the design, synthesis, morphology, phase behavior, and mechanical properties of semicrystalline, polyolefin-based block copolymers. By using living, stereoselective insertion polymerization catalysts, syndiotactic polypropylene-block-poly(ethylene-co-propylene)-block-syndiotactic polypropylene and isotactic polypropylene-block-regioirregular polypropylene-block-isotactic polypropylene triblock copolymers were synthesized. The volume fraction and composition of the blocks, as well as th
We study thermoplastic elastomers of triblock copolymers, of the form polystyrene−polyisoprene−polystyrene (SIS), where the microphase-separated PS blocks act as physical cross-links for the PI elastic network. Two compositions are examined: one with micellar cubic and the other with hexagonal cylindrical morphology of PS. Remarkably, the long-time stress relaxation is very similar; it reveals a continuous crossover between the typical response of a classical rubber at low temperatures and that
We study the slow relaxation of stress in polydomain acrylate liquid crystalline elastomers undergoing the alignment transition under an imposed extension. We analyse the long-time stress relaxation, the slow approach to the mechanical equilibrium and the role of time-temperature superposition. By building the master curves, we investigate extrapolated time intervals and show the presence of two distinct relaxation regimes. At the first stage, the fast power-law relaxation of stress, with the ex
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