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B2.01 - Self-Repairable Polymer Networks 
December 1, 2014   10:00am - 10:30am
  Synced Audio / Video / Slides

Materials with bio-inspired attributes are excellent candidates for the development of new technologies. Manifested by the ability to respond to stimuli, bio-inspired properties not only extend materials lifetime, but may also minimize environmental footprint. Among particularly impressive properties of bio-inspired materials that recently received significant attention is the ability to self-repair. Recent studies have utilized a variety of non-covalent and covalent chemistries that have led to self-healing polymers. The main challenge is to generate polymer networks that exhibit high glass transition temperature (Tg) with remote self-repairing, triggered by electromagnetic radiation, electric and/or magnetic fields, and environmental/atmospheric changes. This presentation will focus on the recent advances in utilization of coordination chemistries in which catalysts may play a dual role; (1) catalyze crosslinking reactions forming thermosetting networks and (2) serve as self-repairing components. Covalent incorporation of chemically modified polysaccharides into crosslinked polyurethanes offers another opportunity. Upon mechanical damage, followed by UV light exposure, these networks exhibit self-repairing properties. Furthermore, when monosaccharide moieties are crosslinked, self-repairing is achieved in the presence of atmospheric carbon dioxide and water. Unlike plants, these networks require no photo-initiated reactions, thus are capable of repairs in darkness under atmospheric conditions. Physico-chemical processes responsible for this unique self-repair process involve physical diffusion of cleaved network components to damaged area, which lead to the formation of carbonate and urethane linkages.

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