Yang Nan, Wang Xiyuan, Weng Yunxuan, Jin Yujuan, Zhang Min
School of Materials and Mechanical Engineering of Beijing Technology & Business University, Beijing 100048, China.
Sheng Wu Gong Cheng Xue Bao. 2016 Jun 25;32(6):839-847. doi: 10.13345/j.cjb.160128.
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%.
采用转矩流变仪制备了聚乳酸（PLA）/聚（己二酸丁二醇酯-对苯二甲酸丁二醇酯）（PBAT）与三乙酸甘油酯（GTA）的共混物，并利用差示扫描量热仪（DSC）、动态力学分析仪（DMA）、万能试验机、冲击试验机和扫描电子显微镜（SEM）研究了GTA对PLA/PBAT复合材料热力学性能、力学性能和微观结构的影响。添加GTA后，两相的玻璃化转变温度（Tg）值逐渐接近，共混物的冷结晶温度和熔融温度降低。当GTA用量为3份时，PLA/PBAT共混物的分散相粒径减小。力学性能测试表明，添加3份GTA时，PLA/PBAT共混物的断裂伸长率和冲击强度大幅提高，断裂伸长率提高了2.6倍，从17.7%提高到64.1%。
