時間：2024年08月07日 (三) 10:00

主持人：許梅娟 教授

講者：Prof. MASATAKA KUBO

服務單位：Division of Applied Chemistry, Graduate School of Engineering Mie University

講題：Preparation of Cyclic Polymer and Its Application to Nonbonding Cross-Linking Agent for Polymer Network with Movable Cross-Linking Points

地點：四樓創意講堂

摘要 :

Cyclic polymers with ring topology and no chain ends are a unique class of macromolecules. Recently, significant advances have been made to prepare these fascinating polymers, which allow for the exploration of their topological effects and potential applications in various fields. In this talk, I first show representative synthetic strategies for making cyclic polymers. Second, I will show examples application of cyclic polymers to nonbonding cross-linking agent for polymer network with movable cross-linking points. Recently, new approach for constructing polymer network has been developed utilizing mechanical cross-linking through chain threading of ring segment. These network polymers are expected to exhibit good swelling properties and high impact strength due to high degree of freedom in the segmental movement since cross-linking points can move. One methodology to introduce such movable cross-linking points is to carry out copolymerization of cyclic macromonomer with a monomer. Chain threading of the cyclic segment by the propagating main chain leads cross-linked structure. However, drawback of this method is that network structure is not homogeneous. Because network structure forms at early reaction stage and the viscosity of reaction mixture increases rapidly, so, diffusion of cyclic macromonomer becomes difficult. Therefore, we designed two-step cross-linking method. First step is formation of pseudopolyrotaxane. And second step is covalent fixation of ring segment to linear segment. We applied this two-step cross linking strategy for preparations of hydrogel and silicone with movable cross-linking points.

學經歷 :

Education
1983 B. S., Faculty of Engineering, University of Tokyo
1985 M. S., Graduate School of Engineering, University of Tokyo
1992 Ph. D., Graduate School of Engineering, University of Tokyo

Experience
1885–1986 Chemical Engineer, Fuji Photo Film Co. Ltd.
1987–1991 Research Associate, Mie University
1992–2008 Associate Professor, Mie University
1993–1994 Visiting Professor, Chemistry Department, University of Arizona, USA
2009– Professor, Mie University
2020–2021 Vice Dean, Graduate School of Engineering, Mie University
2022–2023 Executive Assistant to the President of Mie University (Education)
2024– Councilor of Mie University

Society Activity
1982– The Chemical Society of Japan
1987– The Society of Polymer Science, Japan
1991– American Chemical Society
2017– The Society of Rubber Science and Technology, Japan