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为考察聚合物基复合材料的热氧老化性能,将双马来酰亚胺及其复合材料置于150℃有氧环境中老化1000 h,采用动态力学分析,热重等测试了材料物理性能;采用X射线光电子能谱分析了双马来酰亚胺复合材料化学结构变化,对比了不同老化时间材料性能的变化规律,分析了老化机制。结果表明,双马来酰亚胺树脂基体和复合材料的表层发生了明显化学变化,在老化初期,玻璃化转变温度有所升高,随老化时间延长逐渐趋于平稳,树脂在老化1000 h后,质量损失为5%时对应的温度下降30℃,XPS结果表明复合材料表层发生了氧化反应,生成了新的官能团。
In order to investigate the thermo-oxidative aging properties of polymer-based composites, the bismaleimide and its composites were aged in an oxygen environment at 150 ℃ for 1000 h, and the physical properties were tested by dynamic mechanical analysis and thermogravimetry. The chemical structure of bismaleimide composite was analyzed by X-ray photoelectron spectroscopy. The variation of material properties at different aging time was analyzed and the aging mechanism was analyzed. The results showed that the surface layer of the bismaleimide resin matrix and composite material had obvious chemical changes. At the initial stage of aging, the glass transition temperature increased, and gradually stabilized with the aging time. After the resin was aged for 1000 h , And the corresponding temperature dropped by 30 ℃ when the mass loss was 5%. XPS results showed that the surface of the composite material was oxidized and new functional groups were formed.