加工工艺条件对聚乳酸耐热性的影响研究

摘要

PLA was processed in HAKKE rheometer under different processing conditions. Structure characterization and thermal property of the PLA samples was also confirmed through DSC and MFR. The results indicated the viscosity, MFR and T8 decreased with the increase of processing temperatures, time and revolving speed, the molecular weight, the thermal degradation of PLA was aggravated.%采用哈克转矩流变仪制得不同加工条件下的聚乳酸样品;采用差式扫描量热法(DSC)和熔体质量流动速率(MFR)对聚乳酸样品进行了结构表征和热性能分析.实验结果表明:随着加工温度、加工时间及转速等的增加,聚乳酸的黏度,玻璃化转变温度(Tg)等都有一定程度的减小,即加剧了聚乳酸的热降解.