Premium
Synthesis of graft poly(ester ether) by ring‐opening copolymerization of epoxy‐terminated poly(ethylene glycol) with lactones
Author(s) -
Ikeda Isao,
Horie Naofumi,
Suzuki Kimihiro
Publication year - 1994
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1994.070540815
Subject(s) - copolymer , polymer chemistry , ethylene glycol , epoxide , monomer , ether , sodium methoxide , chemistry , peg ratio , ring opening polymerization , ethylene , epoxy , methanol , materials science , catalysis , organic chemistry , polymer , finance , economics
The copolymerization of epoxy‐terminated poly(ethylene glycol methyl ether) (CH 3 PEG–epoxide) with lactones such as ϵ‐caprolactone (CL) was carried out to prepare the PEG graft poly(ester ether). The methanol‐insoluble part of the reaction product was considered to be the graft copolymer. The graft copolymer was prepared using potassium tert ‐butoxide or sodium methoxide as a catalyst. The apparent number‐average molecular weight ( M̄ n ) of the graft copolymers increased with an increase in CL concentration and a decrease in the dielectric constant of the solvents. ß‐Propiolactone (PL) and δ‐valerolactone (VL) were also copolymerized with CH 3 PEG–epoxide as well as was CL. The apparent composition of the graft copolymers (lactone units/CH 3 PEG) was greater than the feed ratio of the two monomers in all cases. On the other hand, the composition of copolymers prepared with the copolymerization of low molecular weight epoxides such as phenyl glycidyl ether with VL was almost consistent with the feed ratio of the two monomers. © 1994 John Wiley & Sons, Inc.