Study on Ultraviolet Light Aging Test of Ultra-high Molecular Weight Polyethylene Fiber Nets
In order to reveal the aging law of ultrahigh molecular weight polyethylene(UHMWPE)fiber net under ultraviolet light,the chemical composition,morphology and strength of UHMWPE fiber net under ultraviolet light were studied by Fourier transform infrared spectroscopy,scanning electron microscopy,differential scanning calorimetry and tensile experiments.The results show that ultraviolet light can break the main chain of ultrahigh molecular weight polyethylene and induce the molecular degradation of polyethylene.From the original surface flatness,cracks and pits appear gradually,and the fracture morphology changes to brittle fracture gradually.The mechanical properties decreased significantly from the original 850.8 N to 79.1 N after 10 cycles of ultraviolet irradiation.Ultraviolet radiation leads to internal C-C bond breakage and a decrease in the melting peak of folded chain crystallization,while irradiation at high temperatures promotes the ingress of oxygen molecules and other gases through micro-cracks and pores,generating C=O and C-O-C bonds,thereby inducing a series of oxidation reactions.Ultimately,this results in the degradation of UHMWPE and a decrease in its mechanical properties.
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维普
