氧化石墨烯对聚酰胺6热氧老化性能的影响

摘要

Polyamide 6 (PA6) filled with oxide graphene (GO) at different mass ratios were prepared by solution blending.The carboxyl index (CI) was determined by attenuated total internal reflectance Fourier transform infrared spectroscopy (FTIR-ATR) to study the thermal oxidative aging of composites,the thermal stability of composites was studied by thermogravimetric analysis (TGA),the variation of mechanical properties of composites with aging time was studied by tensile test,and the dispersion of Go in PA6 matrix was observed by scanning electron microscope.The results indicate that:GO is able to retard the thermal oxidative aging of PA6;the initiated degradation temperature and the temperature of maximum degradation rate increase;1wt％ of GO could disperse uniformly in PA6,and the mechanical properties of composites are improved.The GO sheet structure builds a 3 D network which could impede the indiffusion of oxygen and the diffusion of degradation product.As a result,the resistance to thermal oxidative aging of GO/PA6 composites is improved.%通过溶液共混制备了氧化石墨烯(GO)/聚酰胺6 (PA6)纳米复合材料,采用傅里叶变换衰减全反射红外光谱仪(ATR-FTIR)测定羧基指数(CI)以研究复合材料的热氧老化规律,利用热失重分析(TGA)研究了复合材料的热稳定性,采用拉伸测试研究了复合材料力学性能随老化时间的变化规律,采用SEM观察了GO在PA6基体里的分散情况.结果表明,GO的加入延缓了PA6的热氧老化,并提高了复合材料的起始分解温度和最大分解速率温度;含量为1％的GO在尼龙6基体里能分散均匀,提高了复合材料的力学性能;GO片层结构对氧气的渗透和降解产物的扩散起阻碍作用,并有自由基吸附的能力,因此GO的加入提高了PA6复合材料的抗热氧老化性能.