Dynamically Cross-linked Elastomer Hybrids with Light-Induced Rapid and Efficient Self-Healing Ability and Reprogrammable Shape Memory Behavior

被引:103
作者
Bai, Jing
Shi, Zixing [1 ]
机构
[1] Shanghai Jiao Tong Univ, Sch Chem & Chem Engn, State Key Lab Met Matrix Composite Mat, Shanghai 200240, Peoples R China
基金
上海市自然科学基金;
关键词
Diels Alder reaction; shape memory; IR response; carbon nanotubes; self-healing elastomer; DIELS-ALDER REACTIONS; WALLED CARBON NANOTUBES; COVALENT FUNCTIONALIZATION; SIDEWALL FUNCTIONALIZATION; CHEMISTRY; NANOCOMPOSITES; SURFACE; COMPOSITES; COPOLYMERS; LINKING;
D O I
10.1021/acsami.7b06407
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Pristine carbon nanotubes (CNTs),were activated to exhibit Diels-Alder (DA) reactivity in a polymer matrix, which was modified with monomers containing furan groups. The DA-active polymer matrix was transferred into a dynamic reversible cross-linked inorganic organic-network via a Diels Alder reaction with CNTs, where pristine CNTs were used as dienophile chemicals and furan-modified SBS acted as the macromolecular diene. In this system, the mechanical properties as well as resilience and solvent resistance were greatly improved even with the presence of only 1 wt % CNTs. Meanwhile, the hybrids retained recyclability and exhibited some smart behaviors, including self-healing and reprogrammable shape memory properties. Furthermore, due to the photothermal effect of CNTs, a retro-Diels-Alder (rDA) reaction was activated under laser irradiation, and healing of a crack On the hybrid surface was demonstrated in approximately 10 s with almost complete recovery of the mechanical properties. Such fast and efficient self-healing performance provides a new concept in designing self-healing nanocomposites with tunable structures and mechanical properties. Furthermore, the DA and rDA reactions could be combined to reprogram the shape memory behavior under laser irradiation or thermal treatment, wherein the temporary shape of the sample could be transferred to a permanent shape via the rDA reaction at high temperature.
引用
收藏
页码:27213 / 27222
页数:10
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