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佛罗里达大学Brent S. Sumerlin教授学术报告

作者:pcfm  来源:pcfm   点击数: 3  发布时间:2018-03-06

报告题目:Exploiting light to push the limits of controlled radical polymerization and macromolecular metamorphosis

报告人:Dr. Brent S. Sumerlin

Associate editor of ACS Macro Letters

Butler Polymer Research Laboratory, Center for Macromolecular Science & Engineering, Department of Chemistry, University of Florida, Gainesville, FL 32611-7200

主持人:陈永明  教授

时间:2018年3月7日(星期三)下午16:00

地点:丰盛堂芙兰学术交流中心A403

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摘要:

 Relying solely on mild ultraviolet irradiation of thiocarbonylthio compounds in the presence of vinyl monomers, a new avenue to well-defined ultrahigh molecular weight (UHMW) polymers has been developed. Through the use of aqueous conditions, well-controlled polymers with high molecular weights that are unprecedented for controlled radical polymerizations have been achieved. This photomediated polymerization approach reaches number-average molecular weights in excess of 8.00 106 g/mol with degrees of polymerization above 85,000, making these, to our knowledge, the highest molecular weight polymers ever achieved via reversible-deactivation radical polymerization. In many cases, well-defined UHMW polymers can be obtained in minutes. The utility of the technique is further demonstrated through the synthesis of block copolymers, enabling access to a new field of well-defined UHMW materials and polymers that can undergo dramatic transformations in their topology via a process we call “macromolecular metamorphosis.”






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