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采用扫描电镜(SEM)、差式扫描量热仪和力学测试方法,研究了紫外线对玻璃纤维增强复合材料力学性能的影响.研究表明,随着紫外线辐射时间的延长,试样的拉伸强度和冲击载荷峰值总体上呈先上升后下降趋势,但冲击性能对紫外线的敏感程度要远低于拉伸性能.通过试样的Tg变化可以证明,短期紫外线辐射会引起试样的后固化,造成Tg及力学性能的上升;而长时间的光老化降解作用会导致大分子链断裂,造成Tg和力学性能的下降.图5,表1,参5.
The effects of UV on the mechanical properties of glass fiber reinforced composites were studied by scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and mechanical testing methods. The results show that with the extension of ultraviolet radiation time, the tensile strength and The peak value of impact load generally increases first and then decreases, but the impact performance is far less sensitive to UV than the tensile property.Through the change of Tg, short-term UV radiation can cause post-curing of the sample, resulting in Tg And mechanical properties of the rise; and a long time of photo-aging degradation will lead to macromolecular chains fracture, resulting in decreased Tg and mechanical properties.