AMA 2019 Speakers
Prof. Marek W. Urban (Plenary Speaker)
Clemson University, USA
Biography:.Marek W. Urban is currently the J.E. Sirrine Foundation Endowed Chair and Professor of Materials Science and Engineering with a joint appointment in the Department of Chemistry at Clemson University, Clemson, SC. Before joining Clemson in 2013, Marek was a professor of polymer science at USM and NDSU where he directed the Materials Research Science and Engineering (MRSEC) as well as Industry/University Cooperative Research (I/U CRC) Centers funded by the National Science Foundation.Prof.Marek W. Urban works in the field of polymers, polymer spectroscopy, polymeric coatings and films, stimuli-responsive materials, and self-healing polymers.
美国克莱姆森大学化学系教授， J.E. Sirrine 基金名誉教授，皇家化学学会会员（FRSC）,美国化学学会院士， 化学遗产基金会院士，Prof.Marek W.Urban指导了国家基金会材料研究科学与工程（MRSEC)和工业/大学联合项目中心。他领导的实验团队研究了多项刺激反应性聚合物方面的发现，包括自愈膜、胶体合成和抗菌表面。其研究方向主要包括聚合物、聚合物光谱、聚合物涂层和薄膜、刺激响应材料和自愈合聚合物领域。
Speech Title: Designing Self-Healing Materials from Commodity Monomers
Abstract: Materials with build-in responsive components are outstanding candidates for the development of sustainable technologies. Manifested by the ability to respond to stimuli, these components not only extend materials’ lifetime, but also minimize environmental footprint. Among particularly impressive properties of stimuli-responsive materials that recently received significant attention are materials with the ability to self-repair. Last decade efforts have primarily focused in incorporating supramolecular chemistry and reversible covalent bonding in the development of self-healing polymers. This lecture will outline recent advances in self-healing polymers, with the primary focus on the recent advances in the development of commodity self-healable polymers. Inspired by plants, self-healing can be achieved by incorporating viscoelastic responses to their microstructures during their formation, thus enabling deformation upon mechanical damage to close a wound. This can be achieved by introducing multiphase-separated polymers composed of polycaprolactone (PCL-diol), 1,4-butanediol (BDO), hydroxyl terminated spiropyran (SP), and hexamethylene diisocyanate (HDI) precursors copolymerized into a selfhealing polymer.(1) The presence of micro-phase separated fibrous morphologies facilitate repeatable self-healing due to stable interfacial regions between the hard and soft segments of the copolymer, thus enabling of storage of entropic energy upon mechanical damage to be recovered during self-healing. This lecture will provide the framework of van der Waals interactions in acrylic-based copolymers able to self-heal upon mechanical damage.(2) This behavior occurs when the monomer molar ratios are within a relatively narrow compositional range, forming reversible ‘key-and-lock’ interactions with preferentially alternating copolymer topologies. The unique self-healing behavior is attributed to favorable inter-chain van der Waals (vdW) forces manifested by the increased cohesive energy densities (CED) forming ‘key-andlock’ inter-chain junctions, enabling multiple recovery upon mechanical damage without external intervention. The concept of redesigning commodity copolymers without elaborate chemical modifications containing favorable built-in interactions may inspire many technological opportunities for reinventing existing and the development of new generations of sustainable copolymers with controlled chain topologies that survive repetitive damage-repair cycles.