D,L-丙交酯的聚合

Polymerization of D,L-Lactide

为获得较高分子量的聚 D,L-丙交酯 ,以利于进一步的工业加工与生产 ,采用在低减压度下制得的 D,L-丙交酯经重结晶提纯至熔点为 12 5～ 12 6℃后 ,于 15 0～ 190℃下、3～ 7h内进行聚合 ,可得到聚 D,L -丙交酯粘均分子量 MV 最高为 1.43× 10 5 。

To obtain poly D,L lactide with higher molecular weight,D,L lactide, which had been made under a lower degree of reduced pressure and recrystallized at its melting point of 125~126 ℃,was polymerized at 150~190 ℃ for 3~7 h.A polylactide with a viscosity average molecular weight up to 1.43×10 5 was obtained.It meets the need of processing.