Keio University · 재료과학
아츠시 호타 교수의 연구실은 고분자 설계 및 상전이 거동을 중심으로, 블록공중합체와 유리전이, 액정 고무 등에서 나타나는 복잡한 거동을 이해하는 데 중점을 두고 있습니다. 특히, 고분자 블록의 구조 제어를 통해 기계적 성질과 상 분리 거동을 정밀하게 조절하는 데 성공했으며, 열역학적·동역학적 균형이 유지되는 다상계 고분자 시스템의 거동을 체계적으로 분석하고 있습니다. 이는 고성능 열가소성 엘라스토머, 스마트 재료, 나노조직 제어 등 응용 분야로 이어지는 기초 연구입니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
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
