ＰＥＩ／ ＰＥＥＫ 复合材料的熔融沉积制备及其摩擦磨损性能
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聚合物材料的耐温性能对其摩擦磨损性能具有重要的影响。 为改善聚醚醚酮 （ＰＥＥＫ） 的耐温性能， 采用 聚醚酰亚胺 （ＰＥＩ） 对其进行改性。 利用熔融沉积成型制备聚醚酰亚胺／ 聚醚醚酮 （ＰＥＩ／ ＰＥＥＫ） 复合材料， 考察 ＰＥＩ 的引入对 ＰＥＥＫ 热学性能的影响， 以及 ＰＥＩ 含量对 ＰＥＩ／ ＰＥＥＫ 复合材料摩擦磨损性能的影响。 研究表明： ＰＥＥＫ 与 ＰＥＩ 完全互溶， 随着复合材料中 ＰＥＩ 含量的增大， 复合材料的玻璃化转变温度不断升高， 且力学性能也不同程度地提高； 当 ＰＥＩ 质量分数为 ３０％时复合材料表现出优异的力学性能。 以复合材料力学性能为指标， 获得优化的复合材料熔融沉 积工艺， 即喷嘴温度 ３９０ ℃ ， 底板温度 １７０ ℃ 。 摩擦磨损性能测试发现， 当 ＰＥＩ 质量分数不超过 ３０％时， 复合材料的 摩擦因数和磨损率较为稳定， 而 ＰＥＩ 质量分数超过 ３０％后复合材料的摩擦因数和磨损率变化较大。
The temperature resistance of polymeric materials exerts a critical influence on their friction and wear performance. To enhance the temperature resistance of polyether ether ketone (PEEK), polyetherimide (PEI) was employed to modify PEEK through blending. Polyetherimide/polyether ether ketone (PEI/PEEK) composite materials were fabricated via fused deposition modeling (FDM). The effects of PEI incorporation on the thermal properties of PEEK, as well as the effects of PEI content on the tribological performance of PEI/PEEK composites, were investigated. The results demonstrate that PEEK and PEI are completely miscible. As the PEI content in the composite increases, the glass transition temperature (Tg) of the composite gradually rises, and its mechanical properties are also improved to varying degrees. When the mass fraction of PEI reaches 30%, the composite exhibits excellent mechanical properties. Taking the mechanical properties of the composites as the optimization index, the optimal FDM processing parameters were obtained: nozzle temperature of 390 ℃ and build plate temperature of 170 ℃. Tribological performance tests revealed that when the mass fraction of PEI is no more than 30%, the friction coefficient and wear rate of the composites remain relatively stable; however, when the PEI mass fraction exceeds 30%, the friction coefficient and wear rate of the composites change significantly.
