采用γ-氨丙基三乙氧基硅烷(APTES)对凹凸棒土(AT)进行接枝改性制得表面带有伯胺基的改性粒子AT-APTES,然后通过表面引发氧化还原聚合法制备凹凸棒土/聚甲基丙烯酸甲酯(PMMA)杂化粒子AT-g-PMMA.采用红外光谱和热失重分析法对改性粒子和杂化粒子进行表征.结果表明,PMMA成功接枝在凹凸棒土表面,接枝率高这27.1％.通过熔融共混法将杂化粒子与PMMA进行复合,利用旋转流变仪对材料的动态流变行为进行了研究.结果表明,杂化粒子使体系的线性粘弹区和粘流活化能增大,且在低剪切频率下,体系的黏度和模量明显增大,体系黏度对频率的依赖性减小.
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