The ring-opening polymerization of D,L-lactide in the melt was systematically investigated by using stannous octoate as the initiator.The molecular weight of poly (D,L-lactide) was characterized with Mv, Mn and Mw respectively. The results indicated that five variables, namely purity of monomer, initiator to monomer ratio, vacuum level, polymerization temperature and polymerization time had different influences on the molecular weight and molecular weight distribution of poly(D,L-lactide).
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