| Abstract: | 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 C.The copolymer compositions were determined by 1H NMR spectroscopy.The monomer reactivity ratios were evaluated by Fineman-Ross method, Kelen-Tudos method and linear least-squares method.The monomer reactivity ratios of D,L-3- methylglycolide and glycolide or D,L-lactide are rmg= 0.73,rga= 1.47; rmg= 1.71,r1a= 0.92, respectively. |
