相容剂和加工工艺对PA1010/PP共混体系形态和力学性能的影响

Influence of a Compatibilizer and Processing Conditions on Morphology and Mechanical Properties of PA1010/PP Blends

以马来酸酐(MAH)和苯乙烯(St)多单体熔融接枝聚丙烯[PP-g-(MAH-co-St)]为相容剂,制备了聚酰胺1010/聚丙烯(PA1010/PP)共混体系。用毛细管流变仪、扫描电子显微镜、力学性能测试等方法研究了加工工艺和相容剂对PA1010/PP共混体系的形态和力学性能的影响。结果表明,相容剂PP-g-(MAH-co-St)有效降低了PA1010/PP共混体系的熔体流动速率;该共混体系熔体属于假塑性流体,熔体黏度随PP-g-(MAH-co-St)含量的增加逐渐增大;随着相容剂含量的增加,PA1010/PP共混体系中分散相PP的粒径逐步减小,力学性能得到改善,PA1010/PP/PP-g-(MAH-co-St)为70/25/5和70/20/10的共混体系的拉伸强度分别比PA1010/PP(70/30)共混体系提高了55.0%和61.9%,冲击强度分别提高了61.0%和129.7%;剪切速率为706.5 s-1时出现熔体破裂现象;剪切速率为5002.65 s-1时出现严重熔体破裂。

Polypropylene （PP） was grafted with maleic anhydride （MAH） and styrene （gt）, and the product EPP-g-（MAH-co-St）2 was used as a compatibilizer of blends of PAl010 and PP. The influence of PP-g-（MAH-eo-St） on the morphology and mechanical properties of PA1010/PP blends was studied. It was found that PP-g-（MAH-co-St） effectively improved the compatibility of PAl010 and PP, and the mechanical properties of the blends were improved. The melt flow rate decreased, and melt viscosity of the melt increased, and the size of dispersed phase PP reduced with increasing content of PP-g-（MAH-co-St）. When the weight ratios of PA1010/PP/PP-g-（MAH-co-St） were 70/25/5 and 70/20/10, the tensile strength of the blends increased 55. 0 % and 61. 9 %, the impact strength increased 61. 0% and 129. 7%, respectively, based on that of the blend （PA1010/PP=70/30）. Melt fracture appeared when the shear rate was 706.5 s^-1 , which became serious when the shear rate was 5002.65 s^-1.