采用机械共混法制备了天然橡胶(NR)基凹凸棒土(AT)纳米复合材料,研究了复合材料的微观结构、力学性能及硫化特性,探讨了AT补强NR的机理.结果表明,改性后的AT能在NR基体中达到均匀分散并形成良好的聚合物-填料界面,显示出优异的补强效果.AT不但在胶料硫化过程中充当了交联点,而且在试样拉伸过程中沿拉伸方向取向,起了诱导结晶的作用.复合材料的拉伸结晶行为与填料量及填料粒子表面交联点数量有关.改性剂不同导致胶料交联行为存在差异,从而影响复合材料的拉伸结晶及应力-应变行为.改性及胶料混炼未破坏AT的层链结构.
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