Structure Reconfigurable Mechanochromic Polymer with Shape Memory and Strain-Monitored Function Enabled by a Covalent Adaptable Network

编号 020035703

推送时间 20220822

研究领域 林产化工 

年份 2022 

类型 期刊 

语种 英语

标题 Structure Reconfigurable Mechanochromic Polymer with Shape Memory and Strain-Monitored Function Enabled by a Covalent Adaptable Network

来源期刊 Macromolecules

期 第357期

发表时间 20220514

关键词 POLY(N-ALKYL ACRYLATE) COPOLYMERS;  OCTADECYL SIDE-CHAINS;  SOLID-STATE STRUCTURE;  COMB-LIKE POLYMERS;  PHYSICAL-PROPERTIES;  SACRIFICIAL BONDS;  HIGH-PERFORMANCE;  STRENGTH;  RUBBER;  ELASTOMERS; 

摘要 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.

服务人员 尚玮姣

服务院士 宋湛谦

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