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RING-OPENING POLYMERIZATION OF ε-CAPROLACTONE USING LANTHANIDE TRIS(N-PHENYL-3,5-DI-T-BUTYLSALICYLALDIMINATO)S AS SINGLE COMPONENT CATALYST

Institute of Polymer Science, Key Laboratory of Macromolecule Synthesis and Functionalization, Ministry of Education, Zhejiang University, Hangzhou 310027, China

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Xu-feng Ni

Institute of Polymer Science, Key Laboratory of Macromolecule Synthesis and Functionalization, Ministry of Education, Zhejiang University, Hangzhou 310027, China

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, and

Zhi-quan Shen

Institute of Polymer Science, Key Laboratory of Macromolecule Synthesis and Functionalization, Ministry of Education, Zhejiang University, Hangzhou 310027, China

Corresponding author.

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Abstract

Ring-opening polymerization of ε-caprolactone has been carried out by using rare earth Schiff base complexes: lanthanide tris(N-phenyl-3,5-di-t-butylsalicylaldiminato)s [Ln(OPBS)₃] as single component catalyst for the first time. The influences of different rare earth elements, monomer and catalyst concentration as well as reaction time on the polymerization were investigated. Mechanism studies showed that monomer inserts into the active site with the acyl-oxygen bond scission rather than the break of alkyl-oxygen bond.

This work was financially supported by the Key Program of National Natural Science Foundation of China (No. G 20434020), the Special Funds for Major Basic Research Projects (No. G 2005 CB623802), and the Committee of Science and Technology of Zhejiang Province.

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