Key Laboratory of Polymer Ecomaterials, Chinese Academy of Sciences, Changchun Institute of Applied Chemistry, Changchun 130022, China; Hebei Key Laboratory of Functional Polymers, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China.
Key Laboratory of Polymer Ecomaterials, Chinese Academy of Sciences, Changchun Institute of Applied Chemistry, Changchun 130022, China; Engineering Research Center of Synthetic Resin and Special Fiber, Ministry of Education, Changchun University of Technology, Changchun 130012, China.
Int J Biol Macromol. 2023 Nov 1;251:126150. doi: 10.1016/j.ijbiomac.2023.126150. Epub 2023 Aug 5.
High-performance biosourced polylactic acid (PLA)/poly(butylene succinate) (PBS) blends with small amounts of compatibilizer, epoxy-functionalized methyl methacrylate-co-glycidyl methacrylate copolymer (PMMA-GMA), were fabricated by melt compounding. The properties of the modified PLA/PMMA-GMA, PBS/PMMA-GMA, and PLS(PLA/PBS)/PMMA-GMA blends were investigated systematically. DSC combined with X-ray diffraction revealed a low-order semi-crystalline structure for all samples. SEM and DMA showed that the compatibility between PLA and PBS was improved after addition of PMMA-GMA. Rheological behavior of blends showed that the addition of PMMA-GMA resulted in a significant improvement in the viscoelasticity. FT-IR spectra confirmed that the interfacial compatibilization between PLA and PBS phases was improved due to the reaction of epoxy groups with terminal groups of PLA and PBS. Finally, the toughness and notched impact strength of the PLA materials were increased significantly. The elongation at break and notched impact strength of PLS/PMMA-GMA was about 55.7 and 6.2 times than neat PLA after incorporation of 7 wt% PMMA-GMA, respectively.
采用熔融共混法制备了少量增容剂环氧官能化甲基丙烯酸甲酯-甲基丙烯酸缩水甘油酯共聚物（PMMA-GMA）改性的高性能生物基聚乳酸（PLA）/聚丁二酸丁二醇酯（PBS）共混物。系统研究了改性的 PLA/PMMA-GMA、PBS/PMMA-GMA 和 PLS（PLA/PBS）/PMMA-GMA 共混物的性能。DSC 结合 X 射线衍射表明所有样品均具有低阶半结晶结构。SEM 和 DMA 表明，加入 PMMA-GMA 后 PLA 和 PBS 之间的相容性得到提高。共混物的流变行为表明，加入 PMMA-GMA 导致其黏弹性显著提高。FT-IR 谱证实，由于环氧基团与 PLA 和 PBS 末端基团的反应，PLA 和 PBS 相之间的界面增容得到改善。最终，PLA 材料的韧性和缺口冲击强度显著提高。与纯 PLA 相比，加入 7wt%PMMA-GMA 后，PLS/PMMA-GMA 的断裂伸长率和缺口冲击强度分别提高了约 55.7 倍和 6.2 倍。
