摘要
前报中已证明用三氟化硼-环氧氯丙烷(ECH)引发四氢呋喃(THF)聚合具有较高的引发效率,并对在Ac_2O、水和无水存在下的聚合反应进行了研究。本文报道1,4-丁二醇(BG)对BF_3引发THF聚合反应的影响。通常认为在BG存在下,BF_3是不能引发THF聚合的,但本工作证明BG是有效的分子量调节剂。
The molecular weight of polytetramethylene glycol (PTMG) prepared from tetrahydrofu-ran (THF) by using cocatalysts of BF3-etherate and epichlorohydrin (ECH) in the presence of butylene glycol(BG) increased sharply with the polymer conversion, but at yields higher than 80% but could be exactly controlled by the molar ratio of BG to BF3. The polyether obtained possessed around 70 mol% primaly hydrcxyl end-groups and a hydroxyl end-group functionality of two. The content of ECH derived units in each polymer chain containing 18.2 or 33.8 THF derived units is around 1.60 or 2.16, respectively.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1989年第5期637-640,共4页
Acta Polymerica Sinica
关键词
四氢呋喃
开环聚合
丁二醇
BF3
Cationic polymerization, Tetrahydrofuran, Ring-opening polymerization,Butylene glycol, Borontrifluoride etherate, Epicblorohydrin as polymerization promotor, Poly-tetrahydrofuran
