Premium
Synthesis and characterization of poly(ϵ‐caprolactone)‐ b ‐poly(ethylene glycol) block copolymers prepared by a salicylaldimine‐aluminum complex
Author(s) -
Du ZiXiu,
Xu JunTing,
Yang Yong,
Fan ZhiQiang
Publication year - 2007
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.26113
Subject(s) - copolymer , ethylene glycol , caprolactone , crystallization , materials science , peg ratio , polymer chemistry , block (permutation group theory) , chemistry , polymer , organic chemistry , composite material , geometry , mathematics , finance , economics
A series of poly(ϵ‐caprolactone)‐ b ‐poly(ethylene glycol) (PCL‐ b ‐PEG) block copolymers with different molecular weights were synthesized with a salicylaldimine‐aluminum complex in the presence of monomethoxy poly(ethylene glycol). The block copolymers were characterized by 1 H NMR, GPC, WAXD, and DSC. The 1 H NMR and GPC results verify the block structure and narrow molecular weight distribution of the block copolymers. WAXD and DSC results show that crystallization behavior of the block copolymers varies with the composition. When the PCL block is extremely short, only the PEG block is crystallizable. With further increase in the length of the PCL block, both blocks can crystallize. The PCL crystallizes prior to the PEG block and has a stronger suppression effect on crystallization of the PEG block, while the PEG block only exerts a relatively weak adverse effect on crystallization of the PCL block. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007