原位聚合抗磨损PA6／纳米SiO2复合材料制备及其性能研究

Preparation and Properties of In-situ Polymerized PA6/Nano-SiO_2 Composites with Wear Resistance

为提高聚酰胺6(PA6)的抗磨损性能,采用原位聚合法合成并制备了PA6/纳米SiO2复合材料,研究了该材料的抗磨损性能、耐热性能、力学性能和结晶性能。结果表明,原位聚合PA6/纳米SiO2复合材料具有良好的抗磨损特性,当纳米SiO2含量为1%(质量分数,下同)时,复合材料抗磨损性能最佳,该材料的热变形温度、拉伸强度、弹性模量和断裂伸长率均明显高于原料PA6;当纳米SiO2含量为3%时,复合材料热变形温度由原料PA6的64.6℃提高到130℃。采用原位聚合母料法制备的PA6/纳米SiO2复合材料同样具有理想的抗磨损性能,并可获得更好的力学性能,且可大幅降低材料制备成本。

Nano-SiO2 was introduced into PA6 via in-situ polymerization in order to improve its tribological behavior. The wear performance, heat resistance, mechanical properties, and crystallinity of the composites were studied. The optimum wear performance was obtained when the content of nano-SiO2 was 1 wt %. At a content of nano-SiO2 of 3 wt %, the heat distortion temperature, tensile strength, Young＇s modulus, and elongation at break of the composites were obviously better than neat PA6. The heat distortion temperature was increased from 64. 6℃ of PA6 to 130℃ of the composites. Using masterbatch method, the obtained PA6/nano-SiO2 composites also possessed good tribologieal and mechanical properties, as well as low cost.