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聚合物复合材料在工程结构件中可否应用取决于它们在湿/热环境中长期使用后的性能保持程度和尺寸稳定性。复合材料的力学性能会随着使用温度和湿度的增加而降低,并且性能降低的百分率常常和在环境中暴露的时间有关。本文对由长玻璃纤维和短玻璃纤维增强的压制聚苯硫醚复合材料在高温—空气、高温—水环境中长期暴露后的性能变化进行了评价。所测性能包括拉伸强度、压缩强度、弯曲强度、冲击强度和疲劳性能。 在各种苛刻的湿热环境暴露试验中,PPS复合材料展示了良好的性能保留率和尺寸稳定性。单独的温度作用对PPS的影响可以忽略,但在高温—水环境暴露试验中,某些性能有一定的降低。此外还观察到,在一段较长的时间后,其性能将不再随时间继续变化。PPS复合材料暴露在高湿/热环境中,其疲劳性能基本不受影响。
The applicability of polymer composites to engineering structures depends on their level of performance retention and dimensional stability after long-term use in wet / hot environments. The mechanical properties of composites decrease with increasing use temperature and humidity, and the percentage of performance degradation is often related to the amount of time exposed to the environment. In this paper, the performance changes of PPPS reinforced with long glass fiber and short glass fiber after long-term exposure in high temperature-air and high temperature-water environment were evaluated. The measured properties include tensile strength, compressive strength, flexural strength, impact strength and fatigue properties. PPS composites show good performance retention and dimensional stability in a variety of demanding hot and humid ambient exposure tests. The effect of temperature alone on PPS is negligible, but some properties are somewhat reduced in high temperature-water environment exposure tests. It has also been observed that performance over a longer period of time will no longer continue to change over time. PPS composites exposed to high humidity / thermal environment, the basic fatigue properties are not affected.