| 초록 |
Novel two synthetic technics using cationic ring-opening copolymerization of tetrahydrofuran (THF) and ethylene oxide (EO) or just polymerized EO on Poly-THF could lead to random hydroxyl-terminated Poly(EO-ran-THF) or tri-block PEG-PTHF-PEG respectively. These reactions were carried out by using BF3·O(C2H5)2 as catalyst, 1,4-butanediol or PTHF as diol initiator. Copolymer structures were controlled by monomer feed ratio or initial PTHF and EO monomer added amount. Since the molecular weight of obtained polymer was merely dependant on the ratio of [monomer]/[diol], but not on catalyst. The well-defined random and block hydroxyl-terminated copolyether could be obtained as the prepolymer for the polyurethane. |
