期刊
CELL REPORTS PHYSICAL SCIENCE
卷 2, 期 7, 页码 -出版社
CELL PRESS
DOI: 10.1016/j.xcrp.2021.100483
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资金
- US Army Research Office [W911NF1810435]
- U.S. National Science Foundation [NSF-1904962]
- DOE Office of Sci-ence by Argonne National Laboratory [DE-AC02-06CH11357]
- U.S. Department of Defense (DOD) [W911NF1810435] Funding Source: U.S. Department of Defense (DOD)
This study presents a novel tri-block copolymer thermoplastic elastomer network based on acid-anhydride bond exchange operated on a thermomechanical activation mechanism. The system is free of additives/catalysts and fully reprocessable, and its unique architecture allows self-assembly into structured nanostructures that prevent unproductive bond exchange.
Conventional thermosets, despite their technological significance in today's materials economy, present a modern sustainability challenge because of their lack of end-of-life options for recyclability or reprocessability. Emerging covalent adaptable networks (CANs) offer sustainable alternatives to permanently crosslinked materials, but ideal orthogonal working/reprocessing conditions are hardly achievable by the current thermochemical activation mechanism. Here we report a CAN system of additive/catalyst-free, fully reprocessable, crosslinked, tri-block copolymer (tri-BCP) thermoplastic elastomer networks based on acid-anhydride bond exchange operated on a thermomechanical activation mechanism. The unique functionality of the tri-BCP architecture enables self-assembly into inter linked, hexagonally packed cylinder nanostructures that preclude any productive inter-cylinder bond exchange (and, thus, creep) without cooperative thermal and mechanical (heating and compression) processing conditions.
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