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Synthesis and characterization of poly(ϵ‐caprolactone)–poly( L ‐lactide) diblock copolymers with an organic amino calcium catalyst
Author(s) -
Piao Longhai,
Sun Jingru,
Zhong Zhiyuan,
Liang Qizhi,
Chen Xuesi,
Kim JungHyun,
Jing Xiabin
Publication year - 2006
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.24058
Subject(s) - copolymer , gel permeation chromatography , caprolactone , polymer chemistry , differential scanning calorimetry , lactide , polymerization , monomer , materials science , ring opening polymerization , polymer , composite material , physics , thermodynamics
The quasiliving characteristics of the ring‐opening polymerization of ϵ‐caprolactone (CL) catalyzed by an organic amino calcium were demonstrated. Taking advantage of this feature, we synthesized a series of poly(ϵ‐caprolactone) (PCL)–poly( L ‐lactide) (PLA) diblock copolymers with the sequential addition of the monomers CL and L ‐lactide. The block structure was confirmed by 1 H‐NMR, 13 C‐NMR, and gel permeation chromatography analysis. The crystalline structure of the copolymers was investigated by differential scanning calorimetry and wide‐angle X‐ray diffraction analysis. When the molecular weight of the PLA block was high enough, phase separation took place in the block copolymer to form PCL and PLA domains, respectively. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 2654–2660, 2006