报告题目：Tailoring Block Copolymers with Ionic and Hydrogen Bonding: From Adhesives and Elastomers to Engineering Polymers and 3D Printing
报告人：Prof. Timothy E. Long
Virginia Polytechnic Institute & State University, USA
报告时间：2015年9月7日，下午14:30
报告地点：独墅湖校区907号楼1445室
报告人简历：
Tim Long received his B. S. in 1983 from St. Bonaventure University, followed by his Ph.D. in 1987 from Virginia Tech. He spent nearly a decade as a research scientist at Eastman Kodak Company before returning to Virginia Tech as a Professor in the Department of Chemistry. He has over 40 patents in the field of macromolecular science and engineering, and has recently exceeded 210 peer-reviewed publications. He has been a faculty member in the Department of Chemistry since 1998 and recently served as Associate Director of Interdisciplinary Research and Education for the Fralin Life Science Institute at Virginia Tech. He serves currently as the Associate Dean for Research and International Outreach in the College of Science.
He has received many prestigious honors in his field of polymer chemistry recently, including the American Chemical Society (ACS) PMSE Cooperative Research Award and ACS POLY Mark Scholars Award, as well as the Pressure Sensitive Tape Council (PSTC) Carl Dahlquist Award in 2011, Virginia Tech’s Alumni Award for Research Excellence (AARE) in 2010, 2009 ACS Fellow, and invited organizer of the Gordon Research Conference – Polymers, and Chair, ACS Polymer Division.
Abstract
Ionomers and polyelectrolytes represent families of macromolecules that incorporate cationic or anionic sites either pendant or within the polymer main chain. These charged compositions enable tunable physical properties such as ionic conductivity, thermal and chemical stability, water transport, and anion exchange capability. Ion-containing polymers are versatile materials that continuously enable emerging technologies such as water purification, gas separation, gene delivery1, biosensors, fuel cells, and electro-mechanical devices.2 Ionic liquids continue to inspire the design of new families of ionomers and polyelectrolytes. This lecture will present a library of novel monomer strategies wherein the monomers are tailored with a nitrogen or phosphorous site that is capable of efficient alkylation either using a functional monomer strategy or post-polymerization modification. Living anionic and controlled radical polymerization methods enable the preparation of diverse families of ammonium, imidazolium, and phosphonium containing block copolymers, where the placement of the charged site in a low glass transition temperature sequence provides superior performance. The role of block copolymer morphology is critical in determining both water and ion transport properties. The lecture will also highlight an unprecedented step-growth polymerization process leading to a new family of melt processable phosphonium based ionenes whose diversity is further enriched upon anion exchange to finely tune thermomechanical and rheological performance. The potential impact of novel multiphase polymeric systems on adhesion, electro-active membranes, drug delivery, and 3D printing will be discussed.
Selected References
(1) Hemp, S. T.; Smith, A. E.; Bryson, J. M.; Allen, M. H.; Long, T. E. Biomacromolecules 2012, 13, 2439.
(2) Gao, R.; Wang, D.; Heflin, J. R.; Long, T. E. J. Mater. Chem. 2012, 22, 13473.
(3) Allen, M. H.; Hemp, S. T.; Zhang, M.; Zhang, M.; Smith, A. E.; Moore, R. B.; Long, T. E. Polym. Chem. 2013, 4, 2333.
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