引发剂活性和挤出温度对HDPE木塑复合材料反应增容的影响

研究试图通过引发剂与马来酸酐实现高密度聚乙烯和木粉间的反应增容,以改善木塑复合材料的热性能和力学性能。利用双螺杆挤出机同步实现了高密度聚乙烯与木粉的均匀混合、马来酸酐与高密度聚乙烯的接枝和接枝共聚物与木粉表面羟基的界面反应。通过扫描电镜观测了复合材料冲击断面的形貌,测试了复合材料的负荷变形温度和力学性能。分析了引发剂活性和挤出温度对复合材料反应增容的影响。结果表明,用中等活性的过氧化二异丙苯与马来酸酐增容后,复合材料木塑两相间的结合情况明显改善,负荷变形温度、拉伸强度、弯曲强度、缺口冲击强度和断裂伸长率明显提高;而高活性的过氧化苯甲酰与马来酸酐对复合材料的增容效果不佳。用过氧化二异丙苯与马来酸酐增容时,挤出温度升高,马来酸酐的最佳增容用量前移。

Effect of initiator activity and extrusion temperature on reactive compatibilization of HDPE/wood-flour composites

This investigation attempted to improve the thermal and mechanical properties of high-density polyethylene/wood-flour composites via reactive compatibilization between polyethylene and wood-flour by initiator and maleic anhydride.Well-distributed dispersing of wood-flour in high-density polyethylene,grafing reaction of maleic anhydride and high-density polyethylene and interphase reaction of graft copolymer and wood-flour were simultaneously achieved by co-rotating twin screw extruder.Impact rupture suface ...