Ring-opening Polymerization of D,L-Lactide by Lanthanide Tris(2,4,6-trimethylphenolate): Characteristics and Kinetics

• 来源期刊: 中国化学(英文版)
• 年，卷（期）: 2005,（5）
• 页码范围: 613-616
• 页数: 4页
• 语种: 英文

摘要

Tris(2,4,6-trimethylphenolate) lanthanide [Ln(OTMP)3] has been prepared and employed for ring-opening polymerization of D,L-lactide (LA) as single-component catalysts. The characteristics, kinetics and mechanism were examined. The polymerization is first-order with respect to monomer and initiator concentration, and the overall activation energy amounts to 62.9 kJ/mol. DSC curve disclosed the random structure of PLA. 1H NMR spectrum analysis demonstrates that the polymerization of LA proceeded through acyl-oxygen bond cleavage.