化学与环境工程学院

College of Chemistry & Environmental Engineering

2018年化工学院学术讲座(三)

报告题目: 以树状共聚物为模板制备高分子负载的金属纳米粒子及其催化应用

报告人: Professor Mario Gauthier

Department of chemistry, University of Waterloo, Canada

时间:2018327日(星期二)上午9:30

地点:东校区14教北201

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长江大学化学与环境工程学院

2018322

 

报告人简介:

Prof. Mario Gauthier(马里奥教授),1961年出生于加拿大魁北克省,19841989年于麦吉尔大学分别获学士和博士学位,1989年至1991年在德国弗莱堡大学University of Freiburg作博士后,1991~1996年在滑铁卢大学University of Waterloo任助理教授,1996~2002年任副教授,2002年起任教授。2012年至今入选华中科技大学湖北省海外高层次专家学者计划;2015年被聘为武汉科技大学楚天学者讲座教授。

研究专长:树枝状大分子的活性/可控聚合、结构表征及其催化应用。已在Nature Materials/Prog. Polym. Sci./JACS/Nature chemistry/等期刊发表论文110余篇,出版专著11部,国际专利4项。

报告内容简介:

Metallic nanoparticles have found multiple applications in nanotechnology in areas including catalysis, imaging, sensing, chemotherapy, and drug delivery. Graft polymers with a dendritic architecture, the arborescent polymers, are useful as templates for the preparation of metallic nanoparticles with predetermined characteristics. The synthesis of arborescent polystyrene-graft-[poly(2-vinylpyridine)-block-polystyrene] copolymers, with a core-shell-corona (CSC) morphology, was initially achieved by anionic grafting. Unfortunately, the synthesis of these interesting macromolecules by grafting “living” block copolymers proceeds in very low yield, typically around 5-20%. The purification of the CSC copolymers from linear graft copolymer contaminant is also problematic due to the amphipathic character of both components. A simplified procedure was recently developed for the synthesis of these materials, through the formation of polyion complexes (PIC) between an arborescent polystyrene-graft-poly(2-vinylpyridine) copolymer substrate, and block copolymers incorporating a short poly(acrylic acid) segment and a longer segment of either polystyrene or poly(2-hydroxyethyl acrylate). The reaction between the weak polybase and polyacid leads to essentially 100% coupling yield and the formation of spherical species of uniform size, as determined by dynamic light scattering, atomic force microscopy and transmission electron microscopy. The chemical composition of the longer block copolymer segment [polystyrene or poly(2-hydroxyethyl acrylate)] forming the corona of the molecules determines their solubility characteristics (in either non-polar or polar solvents, respectively). These templates are useful for the preparation of metallic nanoparticles with predetermined characteristics and interesting nanomorphologies.