热氧老化对PA10T/GF复合材料性能及使用寿命的影响

Effects of Thermal-oxidative Aging on Properties and Service Life of PA10T/GF Composites

用玻璃纤维(GF)对聚对苯二甲酰葵二胺(PA10T)进行改性得到PA10T/GF复合材料,通过控制熔融共混过程中GF的长度制备短GF增强PA10T(PA10T/SGF)复合材料和长GF增强PA10T(PA10T/LGF)复合材料。采用人工加速老化实验,研究热氧老化对PA10T/GF复合材料力学性能的影响,通过扫描电子显微镜(SEM)对PA10T/GF复合材料的冲击断面以及表面形貌进行分析,并预测了PA10T/GF复合材料的使用寿命。结果表明,PA10T/LGF复合材料的拉伸、弯曲强度以及缺口冲击强度较PA10T/SGF复合材料的高;在240℃下热氧老化50 d后,与PA10T/LGF复合材料相比,PA10T/SGF复合材料具有更好的耐老化性能;SEM分析表明,PA10T/GF复合材料的热氧老化机理主要是由于PA10T树脂的降解所引起的PA10T与GF界面作用的削弱;而通过寿命预测发现当使用温度为150℃时,PA10T/LGF和PA10T/SGF复合材料的使用寿命分别为101 d和86 d,在温度低于172℃时,PA10T/LGF复合材料比PA10T/SGF复合材料具有更长的使用寿命。

Poly(decamethylene terephthalamide)(PA10T)was modified with glass fiber(GF)to obtain PA10T/GF composites.By controlling the length of GF in the melt blending process,short GF reinforced PA10T(PA10T/SGF)composite and long GF reinforced PA10T(PA10T/LGF)composite were obtained.The effects of thermal-oxidative aging on the mechanical properties of the PA10T/GF composites were studied by means of artificial accelerated aging experiment.The impact cross-section and surface morphology of the PA10T/GF composites were studied by scanning electron microscopy(SEM).At the same time,the service lifes of the PA10T/GF composites were predicted.The results show that the tensile strength,flexural strength and notched impact strength of PA10T/LGF composite are better than those of PA10T/SGF composite.After 50 d thermal-oxidative aging process at 240℃,compared with PA10T/LGF composite,PA10T/SGF composite has better aging resistance.SEM analysis indicates that the thermal-oxidative aging mechanism of the PA10T/GF composites is mainly attributed to the weakening of the interfacial interaction between PA10T and GF caused by the degradation of PA10T resin.The service life expectancy of the PA10T/GF composites illustrates that,when the service temperature is 150℃,the service life of PA10T/LGF and PA10T/SGF composite is 101 d and 86 d respectively.PA10T/LGF composite has longer service life than PA10T/SGF composite when the service temperature is lower than 172℃.