| More and more people pay attention to the aging of the glass fiber reinforced 191#unsaturated polyester composites(GFRP).This article carried out exposed aging and indooraccelerated aging of GFRP in jiangjin, wuhan, yuli and lasa. The morphologe, glossiness,yellowness index, weight loss and mechanical property were tested. The microstructure wasanalyzed by means of FT-IR, DMA and XPS. The difference of GFRP in different agingenvironment and the influence of filling compound and coating on age were studied. The relativityof GFRP between indoor and outdoor was researched.The result showed that the colour of GFRP change from yellow to white. And glossinessdecrease. Surface resin fall off. Grass microfibers were exposed. Strength firstly increase thendecrease. The cure dominates in the early stage, and the degradation dominates in the later stage.The order of climated influence on age was as follow :humidity>temperature>irradiration. Theorder of aging degree of aging was as follow:jiangjin>wuhan>yuli>lasa. Polyester glass fiberbecome darken is mainly due to heat. Sunlight can lead to crack and drop of surface resin.Mechanical property after indoor accelerated aging firstly increase then decrease, but the risetimeof xenon-arc exposure is shorter and the fall time is longer. The weakness of backbone wasattacked by oxygen gas molecule to become alkane oxygen free radical. Alkane oxygen freeradical firstly become C-O, C=O and C=O, and then become O=C-O. The surface groupswere mainly composed of C-O and O=C-O. The early stage of xenon-arc aging is similar withthe degradation of thermo-oxidative aging. Finally, the degradation of O=C-O dominates, andmore radical lead to more degradation of backbone. Xenon-arc exposure is more destructive thanthermo-oxidative aging in indoor accelerated aging.Filling compound decrease the glossiness and mechanical property. The slowdown ofyellow index was delayed for thermo-oxidative aging, but the slowdown of yellow index wasaccelerated for xenon-arc aging.The coating decrease the whole mechanical property, but hindereffectively penetration of water and oxygen into polyester, and prevent aging.There is correlation between exposed aging and indoor accelerated aging for GFRP. The correlation factor of bending strength between western exposed aging and thermal oxidativeaccelerated aging is 36 and 2 in wuhan, wuhan, yuli and lasa.; The four correlation factor oftensile strength between exposed aging and the other accelerated aging are equal, and Thecorrelation factor is respectively 12, 12, 12 and 3; The correlation factor of shear strength isrespectively 30 and 3.33, 24 and 2.67, 36 and 4, 30 and 3.33. Compared to thermo-oxidative aging,Xenon-arc exposure have more accelerated aging effect. |
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