三乙酸甘油酯对PLA/PBAT共混体系性能影响

Effect of glyceryl triacetate on properties of PLA/PBAT blends

摘要:

利用转矩流变仪将聚乳酸 (PLA)、聚己二酸对苯二甲酸丁二酯 (PBAT) 和三乙酸甘油酯 (GTA) 熔融共混，利用差示扫描量热仪 (DSC)、动态热机械分析仪 (DMA)、万能材料试验机、冲击试验机、扫描电子显微镜 (SEM) 对共混物的热力学性能、力学性能以及微观形态结构进行测试和表征。实验发现，加入GTA后共混物的两相玻璃化转变温度呈相互靠近趋势，冷结晶温度和熔融温度都降低。当GTA加入量为3份时，共混物中分散相粒径减小，PLA/PBAT/GTA (80/20/3) 组分的断裂伸长率得到明显提升，增加了2.6倍，由未加入GTA时的17.7%增长到64.1%。

Abstract:

Poly lactic acid (PLA)/Poly (butyleneadipate-co-terephthalate)(PBAT) and glyceryl triacetate (GTA) blend were prepared by torque rheometer, and the effect of GTA on thermodynamical performance, mechanical properties and microstructure of PLA/PBAT composites were studied using differential scanning calorimeter(DSC), dynamic mechanical analysis(DMA), universal testing machine, impact testing machine and scanning electron microscope(SEM). After adding GTA, Tg values of the two phases gradually became closer, blends cold crystallization temperature and melting temperature decreased. When with 3 phr GTA, the dispersed phase particle size of PLA/PBAT blend decreased. Mechanics performance test showed that the elongation at break and impact strength of the PLA/PBAT blend was greatly increased with 3 phr GTA, and the elongation at break increased 2.6 times, improved from 17.7% to 64.1%.