硅氧烷
自愈
材料科学
弹性体
聚二甲基硅氧烷
离子
氟化物
水解
自愈材料
劈理(地质)
自组装
化学工程
聚合物
高分子化学
纳米技术
复合材料
有机化学
化学
无机化学
医学
断裂(地质)
替代医学
病理
工程类
作者
Masuko Suzuki,Taiki Hayashi,Takuya Hikino,Masafumi Kishi,Takamichi Matsuno,Hiroaki Wada,Kazuyuki Kuroda,Atsushi Shimojima
标识
DOI:10.1002/advs.202303655
摘要
Self-healing ability is crucial to increasing the lifetime and reliability of materials. In this study, spatiotemporal control of the healing of a polysiloxane material is achieved using a cleavable cage compound encapsulating a fluoride ion (F- ), which triggeres the dynamic rearrangement of the siloxane (Si-O-Si) networks. A self-healing siloxane-based elastomer is prepared by cross-linking polydimethylsiloxane (PDMS) with a F- -encapsulating cage-type germoxane (Ge-O-Ge) compound. This material can self-heal repeatedly under humid conditions. The F- released by hydrolytic cleavage of the cage framework contributes to rejoining of the cut pieces by promoting the local rearrangement of the siloxane networks. The use of a molecular cage encapsulating a catalyst for dynamic bond rearrangement provides a new concept for designing self-healing polysiloxane materials based on integrated extrinsic and intrinsic mechanisms.
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