10/5(五)演講公告

20181005-Hideaki Yokoyama 

演講人Hideaki Yokoyama 教授 

服務單位日本東京大學新領域創成科學研究科 

演講題目Structures and Properties of Dynamic Polymer Brush 

演講時間107105(星期五)下午200 

演講地點工綜館215室 

個人學歷 

康乃爾大學 / 材料科學與工程學系 / 博士 

東京工業大學 / 高分子化學系 / 碩士 

東京工業大學 / 高分子化學系 / 學士 

個人經歷 

日本東京大學/副教授 

日本国立研究開発法人産業技術総合研究所 (AIST) /資深研究員 

日本東京普利司通股份有限公司/研究員 

演講摘要 

A layer of polymer chains tethered by one end to a surface is called polymer brush and known to show various unique properties such as prevention of protein adsorption and anti-fouling activity. The surface segregation phenomena of copolymers with surface-active blocks should be useful for preparing such a brush layer in spontaneous process. We reported hydrophilic polymer brushes formed at the interface between water and hydrophobic polymer matrix by the segregation of amphiphilic diblock copolymers blended in the matrix. In this system, while the hydrophilic block with high surface energy avoids air surface it segregate to cover the interface between hydrophobic PDMS and water. The structures of formed brush layers at D2O/polymer interfaces were analyzed by neutron reflectivity (NR). The brush density was calculated to be as high as 2 chains/nm2, which is surprisingly comparable to the polymer brush fabricated by the “grafting-from” method. Moreover, even if the brush is lost or damage, the remaining block copolymers embedded in the elastomer can segregate again to repair the brush (self-repair). Therefore, the kinetics of dynamic polymer brush growth, which determine the time for self-repair, is very important. The kinetics of dynamic polymer brush formation was investigated using Quartz Crystal Microbalance (QCM), contact angle measurement and time-resolved NR.

20181005-2