对熔融插层法所制备的纳米蒙脱土/聚丙烯(OMMTl/PP)复合材料,分别在100℃、110℃、120℃进行O～12 d的热氧老化,考察其热性能、热稳定性、拉伸强度的衰减及其动力学.TG、DSC、FTIR分析结果表明:纳米OMMT1/PP复合材料比PP的热分解温度升高37℃,结晶度由51%提高到71%,而且有机化的纳米MMT片层与PP之间存在较强的作用,因此热氧作用的C＝O吸收峰明显弱化,表面轻微开裂.100～120℃老化后OMMT1/PP的强度保持率大大优于纯聚丙烯材料(8～22倍),OMMT1/PP 110℃老化12 d后拉伸强度仍然达54%.建立了以拉伸强度为参数的OMMT1/PP热氧老化的一级反应动力学方程,其热氧老化反应的活化能为52.3 kJ/tool,为PP的1.7倍.分析认为:OMMT1/PP较高的活化能值以及优良的抗热氧老化能力来自其剥离型纳米化MMT片层对PP的力学保护作用、物理阻隔效应以及OMMT1与PP之间化学交互作用的综合结果.
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