The results show that high-molecular weight PLA can be prepared by the direct meltcondensation polymerization at suitable technological condition and the product has good biodegradability.
结果表明：采用适当的工艺能通过熔融缩聚法制备出高分子质量的聚乳酸，且具有良好的生物降解性能。
2
Mp could markedly promote the condensation process, decrease the fire resistance of melt drip and improve the flame retardance.
而MP可显著增强其凝聚相过程，有效降低材料的熔滴燃烧性，提高材料的阻燃性能。
3
The double - melt behavior, thermal stability of soild state condensation polymerization of PET and the crystallization, expansibility of PET bottle have been studied by DSC, TGA and TMA.