聚乳酸／三乙酸甘油酯的热力学和老化性能研究

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Amorphous poly （ lactic acid ） （ PLA ） was modified with glycerol triacetate （ GTA ） as a plasticizer by melt blending. Thermal properties, mechanical properties, aging and thermal stability of PLA / GTA were studied. The effects of GTA content on the properties of PLA were studied in details. The results showed that with GTA content increasing, Tg, tensile strength of PLA/GTA decreased, elongation at break increased.When GTA content was 15%, brittle-ductile transition was found and PLA /GTA exhibited excellent performance. The aging tests showed that PLA/GTA aged at 60 ~C for 7 days undertook crystallization, and the compatibility between PLA and GTA became poor, but complete phase separation was not found. The thermo-gravimetric analysis exhibited that the degradation temperature of PLA / GTA was higher than that of GTA.采用熔融共混法，以三乙酸甘油酯（GTA）作为增塑剂改性非晶聚乳酸（PLA）。研究了PLA／GTA的热力学性能、老化性能和热稳定性。讨论了GTA用量对非晶PLA性能的影响。当GTA含量增加时，材料的玻璃化转变温度降低，拉伸强度下降，断裂伸长率增加。当GTA质量分数为15％时，材料发生脆韧转变，且此时材料的性能较优。老化实验结果表明，在60℃老化7d后，材料发生了结晶，GTA和PLA的相容性变差，但未出现明显的相分离。热失重测试显示，PLA／GTA的降解温度高于GTA的降解温度。