玻璃纤维增强不饱和聚酯树脂基复合材料的紫外老化性能

UV aging performance of glass fiber reinforced polymer

针对玻璃纤维增强不饱和聚酯树脂基复合材料(GFRP)紫外老化问题,研究了真空导入成型工艺和手糊工艺制作的GFRP试件的紫外老化性能,分析了2种工艺下GFRP试件紫外老化后的巴氏硬度、弯曲破坏形态以及弯曲强度和弯曲模量演变规律。结果表明:紫外光照射后,GFRP试件被照射表面巴氏硬度与未照射表面相比明显下降;紫外老化后GFRP试件的弯曲破坏过程与未老化试件一致;在紫外老化前期弯曲强度和弯曲模量在波动中有所上升,经过一段时间后开始下降,且手糊工艺的下降较多。最终在老化120 d后,弯曲强度和弯曲模量均大于初始值,但低于在室温下密闭处理120 d后的GFRP试件的弯曲强度和模量。

To solve the problems of UV aging on GFRP,the aging resistance of GFRP specimens by vacuum assisted resin transfer molding and hand lay-up was studied. The development rules of Barcol rigidity,bending failure pattern,bending strength,and bending elasticity modulus by two modeling processes after UV exposure were analyzed. Results showed that the Barcol rigidity of the irradiated surface declined obviously compared with the surface without irradiation,and the bending failure process after UV exposure remained same as that before irradiation. The bending strength and bending elasticity modulus fluctuated upward at the early stage of UV exposure,and then declined after a period of time,especially for the specimens by hand lay-up technique. The bending strength and bending elasticity of GFRP irradiated for 120 d were higher than initial values,but lower than the experimental values from the specimens hermetically placed at room temperature for 120 d.