论文部分内容阅读
聚苯醚是当今世界五大通用型工程塑料之一,广泛应用于各行各业。聚苯醚从首次合成出来距今已有半个多世纪,但是关于聚苯醚的合成机理至今仍然没有完全阐明。本文主要介绍了合成聚苯醚氧化偶合反应的三种可能机理:苯氧自由基协同配合物偶合机理、单电子转移偶合机理和一步双电子转移偶合机理。其中,一步双电子转移偶合机理是目前学术界所普遍接受的,并进一步阐述了聚苯醚合成过程中醌缩酮中间体再分配和醌缩酮中间体重排两种合成聚苯醚的链增长机理。
Polyphenylene ether is one of the five general-purpose engineering plastics in the world today, widely used in all walks of life. Polyphenylene ether from the first synthesis since more than half a century ago, but the mechanism of synthesis of polyphenylene ether is still not fully elucidated. This paper mainly introduces three possible mechanisms for the oxidative coupling of polyphenylene ether: coupling mechanism of phenoxy radical synergistic complex, single electron transfer coupling mechanism and one-step two-electron transfer coupling mechanism. Among them, the one-step two-electron transfer coupling mechanism is generally accepted by academia and further elaborates the chain growth of two synthetic polyphenylene ethers, such as the redistribution of quinone ketal intermediates and the rearrangement of quinone ketal intermediates during the process of polyphenylene ether synthesis mechanism.