Key Laboratory of Polymer Ecomaterials, Chinese Academy of Sciences, Changchun Institute of Applied Chemistry, Changchun 130022, China; Department of Science, Beihua University, Jilin 132013, China; College of Chemistry, Jilin University, Changchun 130012, China.
Key Laboratory of Polymer Ecomaterials, Chinese Academy of Sciences, Changchun Institute of Applied Chemistry, Changchun 130022, China.
Int J Biol Macromol. 2020 Jan 15;143:443-452. doi: 10.1016/j.ijbiomac.2019.11.226. Epub 2019 Nov 29.
In the work, the poly(lactic acid) (PLA)/poly (ethylene-butylacrylate-glycidyl methacrylate) (PTW) blends were prepared by melt compounding. PTW as a toughening agent for PLA, the PLA/PTW blends had good compatibility due to the chemical reaction between the epoxy groups of PTW and the end group of PLA during the blending process. With increasing PTW content from 0 to 20%, the impact strength of PLA/PTW blends was enhanced from 4.6 to 54.1 kJ/m and the elongation at break was increased from 5.6% to 270%. The scanning electron microscopy (SEM) images of the impact fracture surfaces showed a large amount of cavities and plastic deformation, which caused by the elastomer and the interfacial adhesion enhanced through the interaction of the terminal functional groups. That was the reason that the toughness of PLA was increased. Finally, proteinase K-catalyzed degradation tests shown that the addition of PTW was beneficial to the biodegradation of PLA and reduced environmental pollution.
在这项工作中，通过熔融共混制备了聚乳酸（PLA）/聚（乙烯-丁基丙烯酸酯-甲基丙烯酸缩水甘油酯）（PTW）共混物。PTW 作为 PLA 的增韧剂，由于在共混过程中 PTW 的环氧基团与 PLA 的端基之间发生化学反应，PLA/PTW 共混物具有良好的相容性。随着 PTW 含量从 0 增加到 20%，PLA/PTW 共混物的冲击强度从 4.6 增加到 54.1kJ/m，断裂伸长率从 5.6%增加到 270%。冲击断裂表面的扫描电子显微镜（SEM）图像显示出大量的空穴和塑性变形，这是由于弹性体和通过末端官能团相互作用增强的界面附着力导致的。这就是 PLA 韧性增加的原因。最后，蛋白酶 K 催化降解试验表明，添加 PTW 有利于 PLA 的生物降解，减少了环境污染。
