3-甲基-3-氧杂丁环甲醇的阳离子型开环聚合

三元和四元环醚具有较大的环张力而易于聚合．Ｖａｎｄｅｎｂｅｒｇ等［１］曾经以（ｉ－Ｂｕ３）Ａｌ／Ｈ２Ｏ为引发剂，使３－甲基－３－（三甲基硅氧甲基）氧杂丁环进行开环聚合反应，合成的聚合物水解后得到线形的聚甲基羟甲基醚．本文以ＢＦ３·ＯＥｔ２为引发剂，对３－甲基－３－氧杂丁环甲醇进行直接引发，实现了开环聚合反应，得到基本线形或轻度支化的聚醚多元醇．１　实验部分１．１　聚合物的合成　聚合装置同文献［１］．所用试剂按文献［１］方法处理．向烧瓶中加入２０ｍＬ的二氯乙烷和０．１ｍｏｌ３－甲基－３－氧杂丁环甲…

Cationic Ring-opening Polymerization of 3-M ethyl-3-oxetanemethanol

This work developed the cationic ring opening polymerization of 3-methyl-3-hydroxymethyleneoxetane initiated by BF₃·OEt₂directly. The resulted polymer was easily dissolved in polar solvents such as CH₃OH, C₂H₅OH, DMSO and N-methyl pyrrolidone, but not dissolved in water, tetrahydrofuran and other non-polar solvents. The TGA study of sample 1 indicates that the polymer starts to pyrolyze at 360 ℃. There is a melting endotherm at 125.9 ℃ in the DSCcurve of sample 1, and the melting peak enlarged with decreasing the amount of catalyst added, which means that sample 1 is essentially linear, and with increasing the amount of catalyst the resulted polymer becomes slightly branched.