中文摘要：

为提高氢氧化镁晶须与基体材料的相容性，研究了氢氧化镁晶须的表面改性技术，结果表明：氢氧化镁晶须较适宜的改性条件是以硬脂酸钠为表面改性剂，改性剂用量2％（按晶须粉体干重计），料浆浓度5％，改性时间30min，改性温度80℃，搅拌速度600r／min。在此条件下，氢氧化镁晶须的活化指数可达到99％，接触角为108．6°。将改性后的氢氧化镁晶须添加到聚丙烯基体中制成复合材料，研究氢氧化镁晶须的增强和阻燃作用，并与水镁石粉体作添加剂进行对比，结果表明：前者氧指数提高4．7％，断裂强度提高64．71％，弯曲模量提高78．6％，断裂伸长率降低315．58个百分点。

英文摘要：

To improve the compatibility of magnesium hydroxide whiskers with the base materials, study is made on the surface modification technology for magnesium hydroxide whiskers. The results show that the optimal conditions for the modification of magnesium hydroxide whiskers include using sodium stearate as the surface modifier, a modifier dosage of 2.0% （dry weight of whisker powder）, slurry concentration of 5%, time duration of 30 min, temperature of 80 ℃and stirring intensity of 600 r/min. Under these conditions, the magnesium hydroxide whiskers can have an activity index of 99% and contact angle of 108.6°. The magnesium hydroxide whiskers thus modified are added to the polypropylene matrix to form composite material and their strengthening and flame-retarding function is investigated and compared with that of brucite powder additive. The results show that the former can help increase the oxygen index by 4.7%, fracture strength by 64.71% and flexural modulus by78.6% and reduce the rupture elongation rate by 315.58 percentage points.