Journal
MACROMOLECULES
Volume 55, Issue 10, Pages 3948-3957Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.2c00529
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- JST CREST [JPMJCR1991]
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A covalent adaptable network was built using a mechanochromic cross-linker, which provided mechanical enhancement and strain-monitored function. The impact of cross-linking design on dynamic behavior and the toughening mechanism were investigated. The covalent adaptable network endowed P(SMA-DMAA) with self-reinforcing ability and shape-reprocess performance.
A mechanochromic cross-linker ditluorenylsuccinonitrile-containing dimethacrylate (DFMA) was used to build a covalent adaptable network. Owing to the reversible dissociation and reassociation of the central C-C bonds of DFMA, poly(stearyl methacrylate-co-N,N-dimethyl acrylamide) [P(SMA-DMAA)] polymer networks presented mechanical enhancement and strain-monitored function. The impact of the cross-linking design, including full-dynamic, non-dynamic, and half-half hybrid, on dynamic behavior was investigated. In addition, the toughening mechanism and structural reconfiguration were discussed. A non-dynamic network protected the steric configuration and maintained restrictions on segments movement. In a full-dynamic network, the stress concentration was detected, and the effective plastic strain that triggered dynamic covalent bonds to dissociate in a wide range. The reassociation of dynamic covalent bonds led to the structural reconfiguration of molecular segments and improvement in segment orientation for adapting deformation. The covalent adaptable network endowed P(SMA-DMAA) with a self-reinforcing ability and a shape-reprocess performance, showing both shape-memory elasticity and macroscopic solid-state plasticity.
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