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Polymerization of lactides and lactones. IV. Ring-opening polymerization of ε-caprolactone by rare earth phenyl compounds

✍ Scribed by Xianmo Deng; Minlong Yuan; Chengdong Xiong; Xiaohong Li

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
153 KB
Volume
73
Category
Article
ISSN
0021-8995

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✦ Synopsis

Ring-opening polymerization of -caprolactone (CL) has been initiated with rare earth phenyl compounds in both bulk and solution. These rare earth phenyl initiators can give polycaprolactone (PCL) with high yield and high molecular weight. The polymerization mechanism is through a coordination-deprotonation-insertion process, by which the monomer inserts on the LnOO bond of rare earth enolate. The efficiency of rare earth phenyl compounds for CL is high. The effects of reaction conditions, such as reaction time, reaction temperature, and monomer/initiator molar ratio, on the polymerization are discussed. The polymer was characterized by FTIR, 1 H-NMR.

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