The process conditions in the stages of esterification, meltpolymerization and solid state polymerization were discussed.
讨论了酯化反应，熔融聚合，固相聚合阶段的工艺条件。
2
Meanwhile, various stabilizers were used to promote the heat stability of the high viscosity PET, and some ideas were given for preparing high viscosity PET by meltpolymerization.
并使用多种稳定剂来改善高粘度树脂的热稳定性，提出了用熔融法制备高粘度PET的一些设想。
3
The results show that high-molecular weight PLA can be prepared by the direct melt condensation polymerization at suitable technological condition and the product has good biodegradability.