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针对聚乳酸(PLA)的自身结晶速率慢而导致其韧性和耐热性差等缺陷,采用聚己内酯(PCL)与PLA熔融共混制备了PLA/PCL材料,并对其力学性能、热稳定性、流变等性能进行了研究。结果表明:PCL的添加量为5%时,PLA共混材料的断裂伸长率可达18.47%,冲击强度可达12.98 kJ/m~2;断面扫描显示,PCL增韧PLA复合材料出现了明显的韧性断裂特征,出现了更多的剪切区域和拉丝现象;DSC表明,PLA的冷结晶峰受到抑制,结晶速率明显提高,复合材料的结晶度比纯聚乳酸提高了73.4%,聚乳酸的韧性得到显著提高。同时,通过热降解动力学分析,进一步从理论上分析其热稳定性能提高的原因。
PLA / PCL was prepared by melt blending polycaprolactone (PCL) with PLA due to the slow crystallization rate of polylactic acid (PLA), which led to its poor toughness and poor heat resistance. The mechanical properties, thermal stability Sexual, rheological and other properties were studied. The results showed that the elongation at break of PLA blend reached 18.47% and the impact strength reached 12.98 kJ / m ~ 2 when the amount of PCL was 5%. The cross-section scanning showed that the PCL toughening PLA composite material appeared obvious DSC showed that the cold crystallization peak of PLA was inhibited and the crystallization rate was significantly increased. The crystallinity of the composites was increased by 73.4% compared with the pure polylactic acid, and the polylactic acid Toughness has been significantly improved. At the same time, through thermal degradation kinetic analysis, further analysis of the reasons for the increase of thermal stability.