Effect of polyethersulfone on the properties of continuous carbon fiber/polyetheretherketone composites
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摘要: 以聚醚砜(PES)作为第三组分及活化PES作为连续碳纤维(CCF)的表面改性剂制备CCF/聚醚醚酮(PEEK)复合材料，重点研究CCF/PEEK复合材料的制备工艺方法对其性能的影响。结果表明：PES作为第三组分制备的CCF/PEEK复合材料，当填充16wt%的CCF时，复合材料表面电阻降低到107~109 Ω，出现导电逾渗状态，此时摩擦系数降到最低(0.2430)。活化PES作为表面改性剂制备的CCF/PEEK复合材料，当填充30wt%的CCF时，复合材料的拉伸强度、弯曲强度、冲击强度分别提高到236.2 MPa、345.1 MPa、12.3 kJ/m2，相比无PES改性的CCF30/PEEK复合材料分别提高了13.69%，21.70%，36.97%，其中PES起到显著的均匀分散CCF与界面粘结作用。摩擦学研究结果表明，复合材料的摩擦性能不仅取决于润滑材料CCF在基体中的分布还取决于CCF与基体的界面作用力。Abstract: In this work, continuous carbon fiber (CCF)/polyetheretherketone (PEEK) composites were prepared by using polyethersulfone (PES) as tertiary component and activated PES as surface modifier for CCF respectively. The research focuses on the effects of the preparation process on the properties of the CCF/PEEK composites. The results show that for the CCF/PEEK composites prepared with PES as tertiary component, when 16wt% of CCF is filled, the surface resistance decreases to 107-109 Ω, appearing conductive percolation state, and the friction coefficient reduces to the lowest value of 0.2430. The tensile strength, bending strength and impact strength of CCF/PEEK composites filled with 30wt% of CCF with surface modifier by activated PES are increased to 236.2 MPa, 345.1 MPa and 12.3 kJ/m2 respectively, which are increased by 13.69%, 21.70% and 36.97% respectively, compared with the CCF30/PEEK composites without PES modification, with the good dispersion of CCF and better interface adhesion between PEEK and CCF surface modified by PES. The tribological results indicate that the friction properties of the composites depend not only on the distribution of CCF in the matrix, but also on the interface force between CCF and the matrix.
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图 1 连续碳纤维(CCF)和聚醚砜(PES)表面改性CCF(CCF(M))的FTIR图谱
Figure 1. FTIR spectra of continuous carbon fiber (CCF) and polyethersulfone (PES) surface modified CCF (CCF(M))
图 2 CCF添加量及制备工艺对CCF/PEEK复合材料表面电阻的影响
Figure 2. Effect of CCF content and preparation process on surface resistance of CCF/PEEK composites
图 4 CCF/PEEK复合材料淬断面SEM图像
Figure 4. Quenched surface SEM images of CCF/PEEK composites ((a) CCF30/PEEK; (b) CCF(Dispersant) (CCF(D))16/PEEK; (c) CCF(D)30/PEEK; (d) CCF(M)30/PEEK)
图 5 PEEK复合材料淬断表面能量分散图谱
Figure 5. Energy dispersive spectra of quenched fracture surface of PEEK composites ((a) CCF(D)30/PEEK; (b) CCF(M)30/PEEK)
图 6 CCF(M)/PEEK复合材料界面相互作用示意图
Figure 6. Interface interaction diagram of CCF(M)/PEEK composites
图 8 CCF/PEEK复合材料界面杨氏模量测试选点图像
Figure 8. Point selection image of Young’s modulus test of PEEK composites interface ((a) CCF30/PEEK; (b) CCF(D)16/PEEK; (c) CCF(D)30/PEEK; (d) CCF(M)30/PEEK)
图 9 CCF/PEEK复合材料的摩擦系数随时间变化的曲线
Figure 9. Time dependent friction coefficient curve of CCF/PEEK composites
图 10 CCF/PEEK复合材料摩擦表面SEM图像
Figure 10. SEM images of CCF/PEEK composites friction surface ((a) CCF30/PEEK; (b) CCF(D)16/PEEK; (c) CCF(D)30/PEEK; (d) CCF(M)30/PEEK)
表 1 PEEK及CCF/PEEK复合材料的摩擦性能
Table 1. Friction properties of PEEK and CCF/PEEK composites
Material Friction coefficient Wear mass loss/mg Wear width/mm Wear rate 10−9cm3/(N·m) PEEK 0.4240 8.1 4.92 8.302 CCF30/PEEK 0.2982 1.0 2.24 1.078 CCF(D)16/PEEK 0.2430 1.7 3.58 1.828 CCF(D)30/PEEK 0.3196 0.7 2.08 0.7856 CCF(M)30/PEEK 0.3845 0.4 2.19 0.4332 
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