采用机械分散工艺制备了Al2 O3/环氧复合材料,研究了颗粒含量和颗粒表面改性对复合材料玻璃化转变温度(Tg)的影响规律.结果表明:微米颗粒的加入并未改变环氧树脂的Tg,而纳米颗粒的加入则产生了较大影响.当未表面改性的Al2O3纳米颗粒含量超过10％(质量分数,下同)时,复合材料的Tg开始下降;纳米颗粒含量为18％时,相比纯树脂体系,复合材料的Tg下降了约25℃.经过辛基硅烷表面改性的纳米Al2 O3颗粒与树脂的相容性得到改善,对体系的增黏效果减小,复合材料的Tg降低幅度较小.
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