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对熔融插层法所制备的纳米蒙脱土/聚丙烯(OMMT1/PP)复合材料,分别在100℃、110℃、120℃进行0～12 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/mol,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。
The OMMT1 / PP composites prepared by melt intercalation method were respectively subjected to thermo-oxidative aging at 100 ℃, 110 ℃ and 120 ℃ for 0-12 days, and their thermal properties, thermal stability Sexual, Tensile Strength Attenuation and Its Kinetics. The results of TG, DSC and FTIR show that the thermal decomposition temperature of nano OMMT1 / PP composite is 37 ℃ higher than that of PP, the crystallinity increases from 51% to 71%, and there is a significant difference Strong role, so the role of thermal oxygen absorption peaks were significantly weakened, the surface slightly cracking. The strength retention of OMMT1 / PP after aging at 100-120 ℃ is much better than that of pure polypropylene (8-22times). The tensile strength of OMMT1 / PP after aging at 110 ℃ for 12 d is still 54%. The first-order kinetic equation of thermal oxidation of OMMT1 / PP with tensile strength was established. The activation energy of thermal aging reaction was 52.3 kJ / mol, which is 1.7 times of that of PP. The analysis shows that the higher activation energy value of OMMT1 / PP and the excellent capability of resisting thermo-oxygen aging come from the mechanical protection effect of PPP, the physical barrier effect and the chemical interaction between OMMT1 and PP result.