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The effect of long-term ultraviolet light irradiation on polymer matrix composites

机译：长期紫外线照射对聚合物基复合材料的影响

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This study reports the individual and combined effects of ultraviolet light and thermal shock on the physical properties of polymer matrix composites in air and in a "near-vacuum system." The longest exposure time was 180 days. It was found that the weight loss of composites increased with irradiation time. In the graphite/epoxy system, the weight loss in air was 2-3 times that in a "near-vacuum system." Similarly, the weight loss of the glass/epoxy system in air was 3-6 times that in a "near-vacuum system." The weight loss of the glass/epoxy system was always larger than that of the graphite/epoxy system. In all cases, the UV irradiation and 1000 times thermal shock did not change the fracture mechanism-it was always brittle fracture in addition to fiber pullout. Surface erosion was observed in the irradiated surfaces by scanning electron microscopy. For both graphite/epoxy and glass/epoxy composites, the tensile strength decreased with increasing irradiation time irrespective of the irradiation environment. However, the decrease was not significant. By SEM, cracks could be observed in the up-surface and side-surface of the glass/epoxy system that was irradiated more than 1 month in air and through 1000 times thermal shock. Obviously, UV light cannot deeply penetrate the sample, and only the surface of the sample will be influenced. The UV radiation initiated microcracks, which propagated through the thermal shock. [References: 13]
机译：这项研究报告了紫外线和热冲击对空气和“近真空系统”中聚合物基复合材料物理性能的单独影响和综合影响。最长的暴露时间是180天。发现复合材料的重量损失随照射时间增加。在石墨/环氧树脂系统中，空气中的重量损失是“近真空系统”中重量的2-3倍。类似地，玻璃/环氧树脂系统在空气中的重量损失是“近真空系统”的3-6倍。玻璃/环氧树脂体系的重量损失总是大于石墨/环氧树脂体系的重量损失。在所有情况下，紫外线照射和1000次热冲击都不会改变断裂机理-除拉出纤维外，断裂总是脆性断裂。通过扫描电子显微镜观察到被照射表面的表面腐蚀。对于石墨/环氧树脂和玻璃/环氧树脂复合材料，拉伸强度均随辐照时间的增加而降低，而与辐照环境无关。但是，下降幅度不大。通过SEM，在玻璃/环氧树脂体系的上表面和侧面可观察到裂纹，该玻璃/环氧树脂体系在空气中经过1000倍的热冲击照射了一个多月。显然，紫外光不能深深穿透样品，仅样品表面会受到影响。紫外线引发微裂纹，并通过热冲击传播。 [参考：13]

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