类玻璃高分子:兼具热固性与热塑性的可逆交联聚合物

Vitrimer:Reversible Crosslinked Polymers with Both Thermosetting and Thermoplastic Properties

热固性材料因具有优异的性能被广泛应用,但永久交联性使其难以回收利用。共价适应性网络由于其独特的可逆变换能够解决热固性材料的回收问题,由此引申出vitrimer(类玻璃高分子)的概念。类玻璃高分子能够在常温下保持热固性树脂的稳定性,但加热时可发生拓扑重排呈现宏观流动性,且粘度均匀改变,这一特性使其可像玻璃一样加工,为热固性材料的循环利用提供一种解决途径。本文介绍了类玻璃高分子材料的性质、类型、机理及近年来各类类玻璃高分子的研究进展,并展望其未来的发展趋势。

Thermosetting materials have been widely used in industry due to their superior properties,but they are difficult to be recycled because of the permanently crosslinked structure.Vitrimer is proposed as a glass-like polymer and its covalent adaptive network endows it unique reversible transformation.Thus,vitrimer is stable at room temperature as the thermosetting polymers and also can undergo topological rearrangement at high temperatures.The polymer network of vitrimer shows macroscopic fluidity at high temperatures and its viscosity decreases with the increase of temperature,which enables vitrimer reprocessable and thus provides a solution for the recycling of thermosets.The types,properties,and formation mechanism of vitrimers are introduced and their current research advance is reviewed in this wok.Meanwhile,the development trend of vitrimers is put forwarded.