类玻璃高分子的再加工

Reprocessing of Vitrimer

类玻璃高分子(vitrimer)是一类含有动态共价键的共价交联聚合物网络,结合了热固性聚合物和热塑性聚合物的优点.在外界刺激作用下,类玻璃高分子的动态共价键能够可逆断裂及形成,而交联密度不会发生变化,这种独特的性质使其能在保持三维交联网络结构的同时,实现再加工、回收再利用、焊接和愈合等功能.因此,类玻璃高分子有望解决传统热固性聚合物无法进行再加工和回收再利用等问题,推进资源的循环利用和社会可持续发展.重点介绍了类玻璃高分子不同的再加工方式,包括热加工、光热加工、电热加工和小分子辅助加工,并对各个加工方式的原理、特点和应用进行总结.最后,对类玻璃高分子再加工的发展进行了展望.

Vitrimers are a kind of covalently cross-linked polymer networks containing dynamic covalent bonds,which combine the advantages of both thermosets and thermoplastics.Under external stimuli,the dynamic covalent bonds in the networks break and reform reversibly,while the cross-link density keeps unchanged.This unique property enables this kind of materials to maintain the three-dimensional cross-linked networks and exhibit various fascinating features such as reprocessing,recycling,welding,healing,etc.Thus,vitrimers are expected to solve the problems that traditional thermosets cannot be reprocessed and recycled,making it possible to promote resource recycling towards a green and sustainable society.This review mainly focuses on the reprocessing methods of vitrimers,including thermal processing,photothermal processing,electrothermal processing and small-molecule assisted processing.Then,the principles,characteristics and applications of each reprocessing method are summarized.Furthermore,the development prospects of vitrimer reprocessing are discussed.