【摘要】 聚合物材料成为现代生产、生活中不可或缺的一类材料,其中热固性材料由于分子结构中稳定的交联结构而具有众多优于热塑性材料的性能。但热固性材料交联固化为非可逆过程,一旦成型则无法重新加工、回收利用,这不仅会造成极大的资源浪费和环境污染,也限制了热固性材料在某些领域的应用。向聚合物分子中引入动态可逆共价键制得的含有共价适应网络结构的高分子材料具有重塑、再加工和可回收等性能。根据交换机理,共价适应网络可分为解离型共价适应网络和结合性共价适应网络。以结合性共价适应网络为基础制备的类玻璃高分子(Vitrimer)材料是近几年新发展起来的一类材料,因其独特的性能引起广泛的关注并被称为除热固性材料和热塑性材料之外的第三类高分子材料。本文介绍了Vitrimer材料的研究背景和性能特征,根据是否完全满足Vitrimer的性能要求分为典型Vitrimer材料和非典型Vitrimer材料,分别讨论了基于不同交换机理构建的Vitrimer材料近几年的研究进展,并对该类材料的发展前景进行了展望。更多还原

【Abstract】 Polymer materials have become an indispensable material in modern production and life,thermosetting materials have better performance than thermoplastic materials due to the stable crosslinked structure in the molecular. However,the cross-linking of thermosetting materials is an irreversible process,and once formed,it cannot be reprocessed and recycled anymore,which will not only cause great waste of resources and environmental pollution,but also limit the application of thermosetting materials in some fields.Polymers containing dynamic reversible covalent bonds can form covalent adaptable networks which endow these polymers with interesting properties for material processing such as reshaping,reprocessing and recycling. Covalent adaptable networks can be classified as dissociative and associative covalent adaptable networks according to the exchange mechanism. Based on associative covalent adaptable networks,a new class of polymer was synthesized named as vitrimer. Vitrimers have attracted wide attention for their unique properties and defined as the third class of polymer materials besides thermosetting and thermoplastic materials.This paper mainly introduces the different exchange reaction mechanisms and research progress of classic vitrimer materials and vitrimer-like materials.This paper introduces the research background and characteristics of vitrimer materials,classic vitrimer materials and vitrimer-like materials are divided according to whether can completely meet the performance requirements of vitrimer. The research progress of vitrimer materials based on different exchange mechanisms in recent years are discussed,and forecasts the development prospect of such materials.更多还原