多元复合改性剂对废旧高密度聚乙烯性能的影响

通过共混挤出的方法制备了多元复合改性剂(MCM),并将其用于改性废旧高密度聚乙烯(WHDPE),分析了MCM添加量对WHDPE复合体系性能的影响。研究结果表明:随着MCM添加量的增加,复合体系的冲击强度明显增大,拉伸和弯曲强度却逐渐减小,当ωMCM10%后,复合体系的冲击强度提升的幅度及拉伸、弯曲强度下降的幅度均有所减小;随着MCM添加量的增加,复合体系的熔融指数总体呈减小趋势,但对其熔融、结晶行为以及热稳定性能没有造成明显的影响;随着MCM添加量的增加,复合体系的冲击断面出现了明显的韧性断裂特征,但当ωMCM10%后,断面出现团聚现象且韧性断裂特征逐渐消失。

The Influence of Multivariate Composite Modifier on Properties of Waste High Density Polyethylene

Multivariate composite modifier (MCM) was successfully prepared by blending out method and was used to modify waste high density polyethylene (WHDPE), while the effect of MCM addition on comprehensive performance of WHDPE composite system was studied. The results showed that the impact strength of composite system increased significantly, and the tensile and bending strength decreased with the increase of MCM addition. The increase amplitude of impact strength and the decrease amplitude of stretch and flexural strength were both reduced when MCM added quality score was over 10%. Melt index of composite system was generally in the trend of decrease with the increase in MCM addition, but the increase of MCM addition had no obvious influence on the fusion, crystallization behavior and thermal stability of composite system. The impact section of composite materials had obvious ductile fracture characteristics with the increase of MCM addition. However, with more than 10% of added MCM, reunion phenomenon occurred in the section and the characteristics of ductile fracture gradually began to disappear.