Citation: Chang Ming DONG, Kun Yuan QIU, Zhong Wei GU, Xin De FENG. Measurement of Monomer Reactivity Ratios of D,L-3-Methylglycolide with Glycolide or D,L-Lactide[J]. Chinese Chemical Letters, ;2000, 11(9): 815-818. shu

Measurement of Monomer Reactivity Ratios of D,L-3-Methylglycolide with Glycolide or D,L-Lactide

a Department of Polymer Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871;
b National Research Institute for Family Planning, Beijing 100081

Received Date: 13 March 2000

Fund Project: This work was supported by the Key Project of the National Natural Science Foundation of China (59833140).

For monomer reactivity ratios study, the copolymerization of D, L-3-methylglycolide (MG) with glycolide (GA) or D,L-lactide (LA) was carried out in bulk to a certain low conversion in the presence of stannous octoate at 140℃.The copolymer compositions were determined by ¹H NMR spectroscopy.The monomer reactivity ratios were evaluated by Fineman-Ross method, Kelen-Tüdös method and linear least-squares method.The monomer reactivity ratios of D,L-3-methylglycolide and glycolide or D,L-lactide are r_mg=0.73, r_ga=1.47; r_mg=1.71, r_la=0.92, respectively.
- D,L-3-methylglycolide,
- glycolide,
- D,L-lactide,
- ring-opening copolymerization,
- monomer reactivity ratios
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