四氢呋喃开环聚合的研究——Ⅳ.发烟硫酸-高氯酸引发四氢呋喃及环氧丙烷的共聚合

用21％或28％发烟硫酸-高氯酸引发四氢呋喃及环氧丙烷(THF:PO=100:5-15(克))进行共聚合反应,收率为50—60％,四氢呋喃的损耗不超过10—15％,产物分子量在1000—2000之间可调。与通常用三氟化硼或五氯化磷及二元醇制备的四氢呋喃-环氧丙烷共聚醚不同;当环氧丙烷用量低时,收率并不降低;产物的端羟基官能度为2;以伯醇端基为主(约65—70％)。

STUDIES ON THE RING-OPENING POLYMERIZATION OF TETRAHYDROFURAN——Ⅳ. OOPOLYMERIZATION OP TETRAHYDROFDRANAND PROPYLENB OXIDE INITIATED BY FUMING SULFURIC ACIDAND PERCHLORIC ACID CATALYST SYSTEM

The yield of copolymerization of tetrahydrofuran and propylene oxide (THF: PO = 5-15, by wt.) using a binary catalyst of fuming sulfuric acid (21% or 28%) and perchloric acid is around 50-60%, and the loss of THP in the reaction is below 10-15%. The average molecular weight of the product can be controlled in the range of 1000-2000 by varying the binary catalyst system. In difference with the usual product of copolymerization initiated by BF3-diol or SbCl3-diol system, the yield of copolymerization with the low PO feed is not decreased, the hydroxyl functionality is equal to 2, the end-groups are predominantly primary hydroxyls (around 65-70%) and the product is colorless.