Ryan Clarke
Speaker's Institution
Colorado State University
4:00 pm
Chemistry, A101
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Research Seminar:  Conventional thermosets, despite their technological significance in today’s materials economy, present a modern sustainability challenge because densely crosslinked network structures preclude recyclability or reprocessability. Emerging covalent adaptable networks (CANs) rely on dynamic bond exchange imbedded within crosslinks to render thermoplastic processability and offer sustainable alternatives to permanently crosslinked materials, but ideal orthogonal working/reprocessing conditions (thermoset performance during work, thermoplastic processability during healing) are not achievable by current examples. In this seminar I will discuss a CAN system of additive/catalyst-free, fully reprocessable, crosslinked tri-block copolymer (tri-BCP) thermoplastic elastomer networks based on acid-anhydride bond exchange and operated on a thermomechanical-responsive activation mechanism. The unique functionality of the tri-BCP architecture enables self-assembly into inter-linked, hexagonally packed cylinder nanostructures which allow us to leverage the separation of exchange-active and non-active domains and regulate “productive” (inter-domain) and “non-productive” (intra-domain) exchange, achieving ideal work/healing orthogonality.