交联PE废旧料的回收方法及可逆交联高分子的研究进展

Recovery methods for cross-linked PE waste materials and progress in the study of reversible cross-linked polymers

随着我国国民经济的快速发展,不可逆交联聚乙烯(XLPE)在日常生活中的应用越来越广泛,但同时也产生了大量的废旧料。通过不可逆化学键形成的XLPE交联结构很难被破坏,导致其加热难熔融、难以循环加工,因此XLPE废旧料回收困难,再生利用率低,并且造成了严重的环境污染。近年来发展起来的可逆交联技术通过在高分子中引入动态化学键形成分子链交联结构,使其在特定物理场下可以解除交联结构,从而具备可回收性和再加工性。本文综述了XLPE的传统回收方法和可逆交联高分子的研究进展,总结了XLPE回收方法的优点和局限性,重点介绍了解离型反应和缔合交换型反应在制备动态交联高分子材料中的应用。

With the rapid development of China’s national economy,irreversible cross-linked polyethylene(XLPE)is more and more widely used in daily life,but at the same time,a large number of waste materials are produced.The chemical bonds in the cross-linked structure of XLPE are hard to break,which makes the material difficult to melt when heated and challenging to recycle.As a result,the recycling rate of XLPE waste materials is low,leading to serious environmental pollution.The reversible cross-linking technology developed in recent years leads to cross-linked molecular chain structures by introducing dynamic chemical bonds into the polymer.The cross-linked structure can be broken down under a specific physical action,making the material recyclable and reprocessable.This paper reviews the traditional methods of recycling XLPE and recent progress in the study of reversible cross-linked polymers.The application of dissociation reactions and association exchange reactions in the preparation of dynamic cross-linked polymers is introduced.The advantages and limitations of different XLPE recovery methods are summarized.