报告题目：Exploiting light to push the limits of controlled radical polymerization and macromolecular metamorphosis
报 告 人：Professor Brent S. Sumerlin （University of Florida）
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.”
Brent Sumerlin graduated with a B.S. from North Carolina State University in 1998 and received his Ph.D. in 2003 at the University of Southern Mississippi under the direction of Dr. Charles McCormick. He continued his work as a Visiting Assistant Professor/Postdoctoral Research Associate in the group of Krzysztof Matyjaszewski at Carnegie Mellon University from 2003–2005. In 2005 he joined the Department of Chemistry at Southern Methodist University as an Assistant Professor, and in 2009 he was promoted to Associate Professor with tenure. In the fall of 2012, Prof. Sumerlin joined the Butler Polymer Research Laboratory and the Center for Macromolecular Science & Engineering within the Department of Chemistry at the University of Florida, where he is currently the George Bergen Butler Professor of Polymer Chemistry. He is a Fellow of the Royal Society of Chemistry and was been named a Kavli Fellow (Frontiers of Science, National Academies of Sciences). Prof. Sumerlin has won a number of awards, including the Alfred P. Sloan Research Fellow, NSF CAREER Award, ACS Leadership Development Award, Journal of Polymer Science Innovation Award, Biomacromolecules/Macromolecules Young Investigator Award, and the Hanwha-Total IUPAC Award. He is an associate editor of ACS Macro Letters.