剑麻纤维/聚丙烯木塑复合材料的热氧老化性能研究

Study on Thermal-oxidative Aging Properties of Sisal Fiber/Polypropylene Composites

以剑麻纤维(SF)、聚丙烯(PP)为原料,经熔融共混、模压成型工艺制备木塑复合材料。探讨了SF/PP复合材料的力学性能、热性能随老化时间和SF含量的变化规律,借助扫描电镜对复合材料老化前后的冲击断面进行微观结构分析。结果表明:老化后复合材料的冲击强度、弯曲强度和弯曲模量随剑麻含量的增加而降低;同时,复合材料中PP相的结晶速率、结晶度也有所降低,但复合材料的热稳定性基本没有变化。

Taking polypropylene （PP） and sisal fiber （SF） as raw materials, SF/PP wood-plastic composites were prepared by melt blending and compression moulding. The effects of thermal-oxidative aging time and SF content on mechanical properties and thermal stability of the composites were studied. The microstructure of impact fracture surface of the composites before and after aging was analyzed by SEM. The results show that the impact strength, flexural strength and flexural modulus of the composites decrease with the increase of SF content; meanwhile, the crystallization rate and degree of crystallinity of PP decrease, while the thermal stability of the composites is almost the same as before.