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Synthesis and characterization of ABA type tri‐block copolymers derived from p ‐dioxanone, L ‐lactide and poly(ethylene glycol)
Author(s) -
Bhattarai Narayan,
Kim Hak Yong,
Lee Douk Rae,
Park SooJin
Publication year - 2003
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.923
Subject(s) - copolymer , lactide , polymer chemistry , differential scanning calorimetry , gel permeation chromatography , ethylene glycol , materials science , crystallinity , polymerization , polymer , ring opening polymerization , peg ratio , fourier transform infrared spectroscopy , chemistry , chemical engineering , organic chemistry , physics , finance , economics , composite material , thermodynamics , engineering
A series of triblock co‐polymers, consisting of a poly(ethylene glycol) (PEG) central block joined to two blocks of random p ‐dioxanone‐ co ‐ L ‐lactide copolymers were synthesized by ring‐opening polymerization of p ‐dioxanone (PDO) and L ‐lactide (LLA) initiated by PEG in the presence of stannous 2‐ethylhexanoate catalyst. The resulting copolymers were characterized by various techniques including 1 H and 13 C NMR and FTIR spectroscopies, gel permeation chromatography, inherent viscosity, wide‐angle X‐ray diffractometry (WAXD) and differential scanning calorimetry (DSC). The conversion of PDO and L ‐lactide into the polymer was studied various mole ratios and at different polymerization temperature from 1 H NMR spectra. Results of WAXD and DSC showed that the crystallinity of PEG macroinitiator was greatly influenced by the composition of PDO and L ‐lactide in the copolymer. The triblock copolymers with low molecular weight were soluble in water at below room temperature. © 2003 Society of Chemical Industry