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利用热压成型法制备碳酸钙(CaCO3)晶须和聚四氟乙烯(PTFE)填充的聚醚醚酮(PEEK)基自润滑复合材料。用动态热机械分析仪测试了复合材料的动态力学性能,得到了储能模量、耗能模量及损耗因子随温度变化(25~300℃)的曲线,并和纯PEEK进行比较,分析填充组分对PEEK动态力学性能的影响。结果表明:CaCO3/PEEK复合材料在玻璃化转变温度(Tg)以下的储能模量比纯PEEK大幅度提高,且随着晶须含量增加而增加;在Tg温度以上,CaCO3/PEEK复合材料储能模量相对纯PEEK仍保持较高的水平,显著提高了复合材料的高温刚性和热变形温度。加入PTFE使CaCO3/PEEK复合材料在Tg温度以下的储能模量有所降低,但在Tg温度以上没有衰退。CaCO3晶须和PTFE的协同作用有助于提高PEEK自润滑复合材料的摩擦学性能。
The PEEK-based self-lubricating composites filled with calcium carbonate (CaCO3) whiskers and polytetrafluoroethylene (PTFE) were prepared by hot press forming. The dynamic mechanical properties of composites were tested by dynamic thermo-mechanical analyzer. The curves of storage modulus, energy dissipation modulus and loss factor with temperature (25 ~ 300 ℃) were obtained and compared with pure PEEK. Effect of Components on PEEK Dynamic Mechanical Properties. The results show that the storage modulus of CaCO3 / PEEK composite under glass transition temperature (Tg) increases greatly compared with pure PEEK, and increases with the increase of whisker content. Above the Tg temperature, the storage modulus of CaCO3 / PEEK composite Relatively pure modulus of PEEK still maintain a high level, significantly increased the high temperature rigidity of the composite material and the heat distortion temperature. The addition of PTFE decreased the storage modulus of CaCO3 / PEEK composites below the Tg but did not decline above the Tg. The synergistic effect of CaCO3 whiskers and PTFE helps to improve the tribological properties of PEEK self-lubricating composites.