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Synthesis and characterization of poly(ϵ-caprolactone)-poly(ethylene glycol) block copolymer

✍ Scribed by Zhixue Zhu; Chengdong Xiong; Lianlai Zhang; Xianmo Deng

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
155 KB
Volume
35
Category
Article
ISSN
0887-624X

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✦ Synopsis

Poly( 1-caprolactone) -poly(ethylene glycol) -poly( 1-caprolactone) triblock copolymers (PECL) covering a wide range of poly(ethylene glycol) (PEG) lengths were synthesized with alkali metal alkoxide derivatives of poly(ethylene glycol). The effects of various factors, such as amount of the initiator, reaction time and temperature, polarity of solvent, length of PEG segment, and counterion on the polymerization were investigated. The copolymers were characterized by 1 H-NMR, IR, GPC, and DSC. It was found that THF system is superior to toluene system. The conversion of the monomer increased with increase of the initiator concentration. High molecular weight of the copolymer and high conversion of the monomer was obtained at below 30ЊC within 5 min. The polymerization process was studied by GPC and the coexistence of propagation and transesterification reaction was found, which leaded to relatively broad molecular weight distribution of the copolymers.

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