摘要
研究了 DF3 、D4共聚合反应的特性 ,该反应是平衡开环共聚反应。当反应达到平衡以后 ,共聚物 [η]与高聚物收率基本恒定。对碱催化剂的研究发现 ,强碱性催化剂有利于合成高分子量的 DF3 、D4共聚物。反应温度升高 ,反应速率加快 ,共聚物分子量降低 ,而且 ln[η]～ 1/ T成线性关系。聚合反应初期采用高温反应 ,后期降低反应温度 ,可以达到缩短反应时间 。
The properties of copolymerization of D F 3, D 4 were studied . It is a balancing copolymerization with opening cycloes. The produce rate of copolymer and high copolymer is almost constant when it is balanced. As for the discovery of alkaline catalyst, strong catalyst is good for producing copolymer of high molecular weight. Owing to the rise of temperature, the copolymerization speeds up, molecular weight of the copolymer decreases down, and it forms a relationship of ln ~1/ T . At the beginning of copolymerizing, to rise the temperature, and then, to reduce it. The purpose of shortening the time of copolymerization and increasing the molecular weight of copolymer can be got.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2002年第2期174-176,共3页
Polymer Materials Science & Engineering
