PLA／ATBC增塑改性体系结晶热性能及耐老化性能的研究

采用熔融共混法，以乙酰柠檬酸三正丁酯（ATBC）作为增塑剂，对聚乳酸（PLA）进行增塑改性，讨论了增塑剂用量对改性PLA结晶热性能及耐老化性能的影响．研究发现：当增塑剂ATBC含量增加时，改性PLA中存在β晶型向α晶型的转变，增塑剂的加入可以使改性PLA的熔点（Tm）、玻璃化转变温度（Tg）降低，结晶度增加；起始热分解温度（Te）和最大热分解温度（Ti）增加，热稳定性变好；增塑剂ATBC的加入可以很好的改善PLA的柔韧性，且当ω（ATBC）为20份时，改性PLA的拉伸屈服强度、直角撕裂强度分别为30．16MPa和119．29kN／m，断裂伸长率增加至380．65%，增塑改性效果最好，即使是在自然条件下老化一年后，其综合力学性能仍可以满足一般产品的要求．

Study on the thermal behavior, crystalline property and anti-aging performance of PLA/ATBC plastication-modified system

Polylactic acid（PLA） was modified with ATBC by melt blending method and the influence of ATBC content on thermal crystallization and anti-aging performance of the blends were discussed in details. The results showed that when adding amount of ATBC, the blend systems appeared a crystal change between β and α, a decrease in melt temperature （Tm）and glass transfer temperature （Tg）, a increase in degree of crystallization, start thermal decomposition temperature（Te）and the largest thermal decomposition temperature （Ti）, which indicating a better thermal stability. When the ω（ATBC ）content was 20 percentage, the tensile strength,rectangular tear strength and elongation at break was 30.16 MPa, 119.29 kN/m and 380. 65%, indicating a better mechanical property, even aging under natural conditions for one year, their mechanical properties were still able to meet the requirements of ordinary products.