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将聚乳酸(PLA)、糊化淀粉与聚碳酸亚乙酯(PPC)进行溶液共混并浇注成膜,对共混膜的力学性能和热性质进行表征;通过正交试验设计研究三元共混组成、增塑剂种类及用量对PLA增韧增塑改性的影响。结果表明:共混组成对于共混膜的断裂伸长率及拉伸强度均是显著影响因素;正交试验最优方案制得共混膜的断裂伸长率比纯PLA膜增加200.98%,拉伸强度比纯PLA膜降低1.09%;PPC的加入是共混物韧性提高的主要因素,而淀粉对产物的力学性能没有优化;同时,三元共混物的热分解温度比原料树脂提高,热分解速度下降,说明改性产物热稳定性有所提高。
Polylactic acid (PLA), gelatinized starch and polyethylene carbonate (PPC) were solution-blended and cast into films to characterize the mechanical properties and thermal properties of the blended films. By orthogonal design, Mixture composition, type and amount of plasticizer on toughening and plasticizing modification of PLA. The results showed that the blend composition had significant influence on the elongation at break and the tensile strength of the blends. The elongation at break of the blends prepared by the orthogonal test was 200.98% more than the pure PLA film, Tensile strength is lower than that of pure PLA film by 1.09%. The addition of PPC is the main factor to improve the toughness of the blend, while the mechanical properties of starch are not optimized. The thermal decomposition temperature of the ternary blend is higher than that of the original resin, Decomposition rate decreased, indicating that the thermal stability of modified products has increased.