UVA紫外辐射对室内碳纤维增强环氧树脂基复合材料性能的影响

研究了Ultraviolet A(UVA)紫外辐射对碳纤维增强环氧树脂基复合材料产生的影响。测量和分析了从窗户照射到室内太阳光和日光灯辐射的UVA紫外线辐照度, 研究了碳纤维增强环氧树脂基复合材料经辐照度为200 μW·cm^-2的UVA紫外灯辐射处理后的力学性能变化, 并通过XPS、 接触角、 纳米压痕、 原子力显微镜(AFM)测试方法研究了其表面性能变化。结果表明: 春夏季节晴天室内太阳光紫外辐照度在14点时达到最大值, 距离窗户0 m处最大值为375 μW·cm^-2, 1 m处最大值迅速降至30 μW·cm^-2; 对功率40 W的日光灯, 距离日光灯0 m处, 紫外辐照度为87.3 μW·cm^-2, 1 m处快速降至5.4 μW·cm^-2; 经过45天的紫外辐射, 碳纤维增强环氧树脂基复合材料的层间剪切强度、 弯曲强度和拉伸强度无明显变化; 碳纤维增强环氧树脂基复合材料表面发生氧化反应, 表面硬度和粗糙度变大。

Effects of UVA irradiation on properties of carbon fiber reinforced epoxy resin composites indoor

The effects of ultraviolet A (UVA) irradiation on properties of carbon fiber (CF) reinforced epoxy resin composites were discussed. UVA irradiance from the sunlight indoor and fluorescent lamp was investigated. After UVA exposure at the irradiance of 200 μW·cm^-2, the changes of mechanical properties and surface properties of CF reinforced epoxy resin composites by XPS, contact angle, nano-indentation, and atomic force microscope (AFM) were studied. The results show that UVA irradiance from the sunlight reaches the maximum value at 14: 00 on the clear days in spring and summer and the maximum value is 375 μW·cm^-2 at the window and sharply decreases to 30 μW·cm^-2 at 1 m far from the window. To the fluorescent lamp of 40 W, UVA irradiance is 87.3 μW·cm^-2 at the lamp and 5.4 μW·cm^-2 at 1 m far from the lamp. After UVA exposure of 45 days, there are no obvious changes on the interlaminar shear strength (ILSS), bending strength and tensile strength. CF reinforced epoxy resin composites have an oxidation on exposed surface and show increasing surface hardness and roughness.