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以液相溶剂热合成和表面改性技术制备的纳米MoS2作为减磨与增强剂,耐磨性差的PMMA为聚合物基,借助超声分散与溶液热流延技术制备MoS2/PMMA纳米复合材料.通过动态力学热分析研究MoS2对PMMA动态力学行为的影响,并探讨材料的宏观组成、微观结构与动态力学性能之间的关系.实验表明,在低温段(<110℃),MoS2对PMMA动态储能模量E’在质量分数0~15%范围呈现出随粒子加入量增加而升高,≥15%又呈下降的趋势,对动态损耗模量E″则随MoS2加入量增加呈下降趋势.在高温段(>110℃),MoS2对E’和E″有提升作用,加入量越高E’和E″温升衰减越趋缓,E’相对稳定平台区间拓宽趋势越明显.MoS2/PMMA复合材料玻璃化转变温度tg和进入粘流态转变温度tf也随MoS2加入量增加向高温偏移,耐热性提高.
MoS2 / PMMA nanocomposites were prepared by means of ultrasonic dispersion and solution casting by using nano-MoS2 prepared by liquid-phase solvothermal synthesis and surface modification as the anti-wear and reinforcing agent and PMMA with poor wear resistance as the polymer matrix. The effect of MoS2 on the dynamic mechanical behavior of PMMA was investigated by mechanical thermal analysis and the relationship between the macroscopic composition, microstructure and dynamic mechanical properties of the material was also discussed. The experimental results show that MoS2 has a great influence on the dynamic energy storage of PMMA at low temperature (<110 ℃) The amount of E ’showed a trend of increasing with the increase of particle addition in the range of 0-15% mass fraction, and a decrease of ≥15%, while the dynamic loss modulus E “decreased with the increase of MoS2 addition. (> 110 ℃), MoS2 has a positive effect on E ’and E ”. The higher the addition amount, the slower the temperature rise of E’ and E", and the more obvious the trend of broadening E ’relative stable platform.MoS2 / PMMA composites Glass transition temperature tg and into the viscous fluid transition temperature tf also increase with the amount of MoS2 increase to high temperature offset, heat resistance increased.