利用封端剂提高共聚甲醛的热碱稳定产物收率的研究  

USE OF END CAPPING AGENT TO INCREASE THE YIELD OF THERMOSTABLE ACETAL COPOLYMER

作　　者：冯定松[1] 崔敏慧[2] 过俊石[2] 谢洪泉[2] 

机构地区：[1]湖北工学院化工系 [2]华中理工大学化学系

出　　处：《高分子材料科学与工程》1999年第1期152-154,共3页Polymer Materials Science & Engineering

基　　金：国家自然科学基金

摘　　要：共聚甲醛大分子链含有对热不稳定的半缩醛端基，必须经热碱后处理使之稳定，因而产物损失较大。为此研究了在三聚甲醛与环氧乙烷或三聚甲醛与二氧五环熔融共聚体系中，通过封端剂甲缩醛或二乙氧基甲烷的使用，对热碱稳定的共聚甲醛的收率提高了３％左右。比较两种共单体，发现用环氧乙烷作共单体并在封端剂存在下，更有利于得到高的热碱稳定产物的收率。The end groups of actal copolymer(POM) were the thermally unstable hemiacetal groups which degraded at high temperature by a zip reaction until the CH 2CH 2O units were reached. The unstable part usually contained to about 10%. In this paper, methylal and diethoxymethane were used as end capping agents to improve the thermal stability of the product in molten copolymerization of trioxane(TOX) with ethylene oxide(EO) or with dioxolane(DOL). The yield of thermostable POM can be increased about 3%. The results also show that EO is better to be used as comonomer than DOL in order to get higher yield of thermostable POM.

关 键 词：共聚甲醛 开环聚合 封端剂 热碱后处理 热碱稳定 

分 类 号：O632.32[理学—高分子化学] TQ326.51[理学—化学]