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Synthesis and characterization of novel block copolymer from trans ‐4‐hydroxy‐ L ‐proline and poly(ethylene glycol)
Author(s) -
Lee RenShen,
Yang JenMing
Publication year - 2001
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.1588
Subject(s) - copolymer , polymer chemistry , differential scanning calorimetry , ethylene glycol , glass transition , polymerization , materials science , degree of polymerization , ethylene , chemistry , catalysis , polymer , organic chemistry , physics , thermodynamics
A series of novel ABA‐type block copolymers were synthesized by polymerization of trans ‐4‐hydroxy‐ L ‐proline (HyP) in the presence of various molecular weight poly(ethylene glycol)s (PEGs), a bifunctional OH‐terminated PEG using stannous octoate as catalyst. The optimal reaction conditions for the synthesis of the copolymers were obtained with 5 wt % stannous octoate at 140°C under vacuum (20 mmHg) for 24 h. The synthesized copolymers were characterized by IR spectroohotometry, proton nuclear magnetic resonance, differential scanning calorimetry, and Ubbelohde viscometer. The glass transition temperature ( T g ) of the copolymers shifted to significantly higher temperature with increasing the number average degree of polymerization and HyP/PEO molar ratio. In contrast, the melting temperature ( T m ) decreased with increasing the HyP/PEO molar ratio. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 1581–1587, 2001