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木粉(WF)填充增强高密度聚乙烯(HDPE)复合材料具有良好的环境效益,少量引入短切碳纤维(SCF)可进一步提高其力学性能。为改善SCF与WF/HDPE复合材料中的塑料基体的界面结合,提高SCF在WF/HDPE复合材料中的增强作用,采用气相、液相及气液双效氧化三种表面处理方式处理SCF,通过挤出工艺制备短切碳纤维增强木粉/高密度聚乙烯复合材料(SCF-WF/HDPE),探讨了不同处理方法对SCFWF/HDPE复合材料性能的影响。SEM显示,表面处理增大了SCF的表面粗糙度,可提高其与基体的界面结合;动态力学性能分析证实碳纤维提高了存储模量。测试结果表明:表面处理过的短切碳纤维可使SCFWF/HDPE复合材料的力学性能、热力学性能、蠕变性能均得到显著提高,其中气相表面处理的效果最好。对比WF/HDPE复合材料,SCF-WF/HDPE的拉伸强度提高了34.5%,弯曲强度提高了23%,冲击强度提高了54.7%。
Wood flour (WF) filled reinforced HDPE composites have good environmental benefits, and the introduction of a small amount of short-cut carbon fiber (SCF) can further improve its mechanical properties. In order to improve the interfacial bonding of plastic matrix in SCF and WF / HDPE composites and enhance the reinforcing effect of SCF in WF / HDPE composites, SCF was treated with three kinds of surface treatment methods of gas phase, liquid phase and gas-liquid double-effect oxidation The SCF-WF / HDPE composites were prepared by extrusion process. The effects of different treatment methods on the properties of SCFWF / HDPE composites were discussed. SEM showed that the surface treatment increased the surface roughness of SCF and improved the interface with the matrix. The dynamic mechanical property analysis confirmed that the carbon fiber increased the storage modulus. The test results show that the mechanical properties, thermodynamic properties and creep properties of SCFWF / HDPE composites can be significantly improved with surface-treated chopped carbon fibers, of which the gas-phase surface treatment has the best effect. Compared with WF / HDPE composites, the tensile strength of SCF-WF / HDPE increased by 34.5%, flexural strength increased by 23% and impact strength by 54.7%.