| The sunlight exposure experiment of PET fibres was conducted in Oinhuangdao and the UVA-340/UVB-313 UV accelerated aging experiments were conducted respectively by the self-developed multi-intensity UV irradiation test device. The tensile performance changes of PET fibres in different exposure environments were studied. SEM, FT-IR were used to study the changes of the surface morphology and microstructure of the PET fibres. The lifetime of the PET fibres aged at the user level and in sunlight was predicted by the accelerated degradation data obtained in different UV exposure environments.The results showed that the aging experiments at different UV irradiation intensities can be carried out successfully by the self-developed multi-intensity UV irradiation test device, which can not only shorten the test cycle but also ensure the consistency of test conditions. The experiment results of the UV accelerate tests and the sunlight exposure test showed that in the UVA-340/ UVB-313 accelerate tests and the sunlight exposure test, the tensile performance changes with aging time of the PET fibres are the same; UVA-340 and UVB-313 exposure tests can accelerate the evolution rates of the surface chemical structures of the PET fibres, and their evolution rules are the same with the sunlight exposure test. Thus, both the UVA-340 and UVB-313 UV lamps can be used in UV accelerate tests. The tensile data was analyzed and the UV intensity-failure time inverse power law lifetime prediction model was established by the Matlab R 2007a, the lifetime prediction results showed that the extrapolation lifetime of accelerate tests and actual lifetime of user level are anastomosing and the prediction error is less than 7%, though the prediction error of the sunlight exposure by the data of UVB-313 accelerated tests is enlarged, the results still showed that the inverse power law modle can achieve better lifetime prediction for PET fibres'aging under UV irradiation conditions. |
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