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对航空聚硫密封剂进行人工加速热氧老化试验,并采用光学显微镜、光泽度仪、邵氏A硬度计、万能试验机、动态力学分析(DMA)法和红外光谱(FT-IR)法等手段分析了热氧老化对聚硫密封剂的表面微观形貌、硬度、拉伸性能、耐热性和基团特征峰等影响。结果表明:随热氧老化时间延长,聚硫密封剂的光泽度逐渐降低,表面出现明显的泡孔缺陷;当老化时间为20~30 d时,密封剂的拉伸强度和断裂伸长率降幅明显;当老化时间为40 d时,聚硫密封剂的硫化反应更加完全,并且老化期间无可降解新官能团生成,而且其耐热性和室温储能模量基本不变,说明其耐热氧老化性能良好。
Artificial accelerated thermal oxidative aging tests were carried out on the aviation polysulfide sealant. Optical microscopy, gloss tester, Shore A hardness tester, universal testing machine, dynamic mechanical analysis (DMA) and infrared spectroscopy (FT-IR) The effects of thermal aging on the microstructure, hardness, tensile properties, heat resistance and the characteristic peaks of groups of polysulfide sealants were analyzed. The results show that the gloss of polysulfide sealant decreases gradually with the aging time of hot oxygen, and obvious cell defects appear on the surface. When the aging time is 20 ~ 30 d, the tensile strength and elongation at break of sealant decrease Obviously, when the aging time is 40 d, the vulcanization reaction of polysulfide sealant is more complete, and no new degradable functional groups are formed during aging, and the heat resistance and the storage modulus at room temperature are basically unchanged, indicating that the thermostable oxygen Aging performance is good.