硅烷偶联剂对PE-HD基木塑复合材料力学性能的影响

采用乙烯基三乙氧基硅烷对稻壳粉进行表面处理，然后在过氧化二苯甲酞（BPO）引发剂的作用下与高密度聚乙烯（PE-HD）混合挤出制备了PE-HD/稻壳粉复合材料。对复合材料进行力学性能测试和熔体流动速率测定，并对硅烷接枝PE-HD粒子进行红外光谱分析，同时利用扫描电子显微镜分析偶联剂处理对复合材料微观形貌的影响。结果表明，偶联剂的加入，降低了熔体流动速率，使得木塑复合材料各组分的分散性和相容性得到了改善；当偶联剂、PE-HD和稻壳粉的质量比为1∶100∶50时，复合材料的力学性能最佳，其中弯曲强度相对于未加偶联剂的复合材料提高了32.24 ％，冲击强度提高了140 ％；稻壳粉的增加，降低了熔体流动速率，提高了复合材料的弯曲强度，降低了拉伸强度、冲击强度和断裂伸长率；乙烯基三乙氧基硅烷已经熔融接枝在PE-HD分子上。

Effects of Silane Coupling Agent on Mechanical Properties of PE-HD/Rice Husk Powder Composites

Rice husk powder was treated with a coupling agent and blended with high density polyethylene forming composites. The composites were subjected to infrared and SEM analysis, their mechanical and rheological properties were tested. It showed that the addition of coupling agent reduced the melt flow rate and improved the dispersion and compatibility of PE-HD/rice husk powder. Optimal mechanical properties of the composites were obtained while the mass ratio of coupling agent, PE-HD, and rice husk powder was 1∶100∶50. The introduction of coupling agent increased the bending strength and impact strength of the composite by 32.2 and 140 %, respectively. When the rice husk powder content increased, the melt flow rate of the composite decreased, the bending strength increased, and the tensile strength, impact strength and elongation at break were reduced. The infrared analysis of silane grafted PE-HD showed that the grafting reaction between coupling agent and PE-HD was occurred.