目的 制备聚乳酸(Polylactic Acid，PLA)/木薯淀粉(Cassava Starch，CS)与PLA/高直链淀粉(High Amylose Starch，HAS)生物可降解包装材料，比较相容剂对复合材料相容性、力学性能以及结晶性能的影响，并优化PLA/HAS复合材料的实验配方。方法 实验采用熔融共混法分别制备HAS、CS共混改性的PLA复合材料，表征其化学结构、力学性能、微观结构及结晶性能，然后采用响应面法优化PLA/HAS复合材料的实验配方。结果 傅里叶变换红外光谱(Fourier Transform Infrared Spectroscopy，FTIR)结果表明，丙三醇三缩水甘油醚(Glycerol Triglycidyl Ether，GTE)上的环氧基与PLA和淀粉上的羟基发生反应型增容;力学结果表明，随着相容剂含量的增加，拉伸性能先增后减，当相容剂为4%时拉伸强度与断裂伸长率达到最佳值;扫描电子显微镜(Scanning Electron Microscope，SEM)和差示扫描量热法(Differential Scanning Calorimetry，DSC)结果表明，相容剂的加入提高了两相体系的相容性和结晶性;在力学性能、结晶性和相容性等方面，PLA/HAS复合材料的性能均优于PLA/CS复合材料;响应面优化PLA/HAS复合材料的配方如下:HAS质量分数为18%，相容剂质量分数为4%，相容剂官能团数为3。结论 高环氧值相容剂GTE、乙二醇缩水甘油醚(Ethylene Glycol Diglycidyl Ether，EGDE)和季戊四醇缩水甘油醚(Pentaerythritol Glycidyl Ether，PGE)能够有效改善PLA和淀粉之间的相容性，PLA/HAS生物可降解包装材料具有良好的应用前景。

The work aims to prepare polylactic acid(PLA)/cassava starch (CS) and PLA/high amylose starch (HAS) biodegradable packaging materials to compare effects of compatibilizers on the compatibility, mechanical properties and crystallization properties of the composites and optimize the experimental formula of PLA/HAS composites. The HAS and CS modified PLA composites were prepared by melt blending method. The chemical structure, mechanical properties, microstructure and crystallization properties of the composites were characterized. Then, the response surface method was used to optimize the experimental formula of PLA/HAS composites. The results of Fourier transform infrared spectroscopy (FTIR) indicated that the epoxy groups on glycerol triglycidyl ether (GTE) reacted with the hydroxyl groups on PLA and starch to achieve reactive compatibilization. The mechanical results showed that the tensile strength and elongation at break increased first and then decreased with the increase of compatibilizer content, and reached the maximum values when the compatibilizer content was 4%. The results of scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) indicated that the addition of compatibilizer improved the compatibility and crystallinity of the two-phase system. In terms of mechanical properties, crystallinity and compatibility, the performance of PLA/HAS composites was superior to that of PLA/CS composites. The optimized formula of PLA/HAS composites was as follows:HAS content was 18%, compatibilizer content was 4%, and the number of functional groups of the compatibilizer was 3. High epoxy value compatibilizers such as GTE, ethylene glycol diglycidyl ether (EGDE) and pentaerythritol glycidyl ether (PGE) can effectively improve the compatibility between PLA and starch, and PLA/HAS biodegradable packaging materials have good application prospects.