中文摘要：

利用微波接枝偶联剂处理秸秆纤维，采用光学法液滴形态分析系统测定3种不同方法处理的秸秆微粉的动态接触角及表面能变化，并制备相应的复合材料进行力学性能测试。研究结果表明：几种界面改性方法对秸秆微粉均有较好的改性效果，微波／KH550改性效果最佳，微波／钛酸丁酯次之，再次为直接微波处理。经微波处理后秸秆纤维的平衡接触角θe由40．26°上升到42．97°，经微波／钛酸丁酯处理后平衡接触角θe由40．26°上升到50．33°，而发现经微波／KH550处理后平衡接触角θe由40．26°上升到94．01°。而表面能则有不同程度减小，经微波／KH550处理后秸秆纤维表面能接近HDPE基体；经界面改性处理的秸秆纤维，其复合材料的拉伸强度提高0．40％～19．79％，冲击强度提高7．21％～15．29％。动态接触角法研究液体润湿微粉的动力学特性具有快速、准确、操作简单的特点，为研究植物纤维表面改性接枝等提供理论基础。

英文摘要：

The surface of straw fiber was modified by microwave-grafted titanate,microwave-grafted silane and microwave respectively. The optical drop let morphology analysis method was used to study the dynamic contact angle of modified straw fiber. The results showed that all the three surface modification had good modifying effects, and the microwave-grafting KH550 had the best modifying ability,the microwave-grafting tetrabutyl orthotita had better modifying ability than microwave radiation. The dynamic contact angle of modified straw fiber increased, the surface energy was even closed to HDPE matrix. The mechanical properties of HDPE/straw composite were improved evidently, from 0.40 % to 19.79 % （tensile strength） and 7.21% to 15.29 % （impact strength） respectively. Compared with other modifiers,microwave-grafting silane could improve the hydrophily and mechanical properties of HDPE/straw composite more effectively. The theoretical foundation could be provided for study on surface modification of plant fiber by microwave-grafting coupling agent.