环烯烃共聚物的生产工艺评述

Production technology of cycloolefin copolymers

介绍了生产环烯烃共聚物(COC)所采用的两种工艺过程,即开环移位聚合过程(ROMP)和茂金属催化加成共聚合过程(mCOC)。通过对单体、催化剂、生产工艺流程、聚合物性能等各方面的综合对比,认为采用ROMP法所制得的产物必须进行后续加氢反应以去除开环所带来的不饱和双键,一般氢化程度大于98%才能得到高质量的COC。而mCOC法则仅需一步反应即可,且催化活性很高,被认为是生产COC树脂最为经济、有效的方法。

Cycloolef＇m and α-olefin copolymers （COC） with excellent transparency, low dielectric loss, outstanding dimensional stability, high heat resistance and gas barrier property are produced by four companies （Ticona, Nippon Zeon Corp., JSR Corp. and Mitsui Chemicals） through either ring-opening metathesis polymerization （ROMP） or copolymerization with metallocene catalysts （mCOC）. These two routes are compared in respect of catalysts, monomers, production processes and product properties. The COC produced through ROMP route has a larger amount of C-C double bond in the macromolecular chains, therefore it has to go through a hydrogenation process to get rid of 98% of the residual double bond in order to produce high-performance materials. The hydrogenation process is not needed if COC is produced through mCOC route. Consequently, mCOC processes are considered economically favorable compared to ROMP processes.