Xenon lamp accelerated aging behavior and mechanism of PE-LLD light-diffusing film
Agricultural polyethylene light-diffusing shed film can improve haze under the condition of high luminousness,and transform the direct light into diffused light,which can promote the inside plant to obtain effective light radiation in all dimensions.Linear low density polyethylene(PE-LLD)light-diffusing film was prepared by adding light diffusion agent,achieving a luminous-ness of 90.99%and a haze of 62.29%,which were 0.55%lower and 152.60%higher than the blank control film.Aging resistance is the basic guarantee of other functional properties of PE-LLD shed film,xenon lamp aging was used to accelerate the degradation of PE-LLD light-diffusing film,the macroscopic optical and mechanical property variation trend is consistent with blank film,and elon-gation at break of two films respectively decrease to 40.58%and 47.01%of the initial value at 13 d(completely aged).The chemical composition,crystallization behavior,crystallite dimension and morphology of the light-diffusing film during accelerated aging were investigated,aging process varied with degradation rate in three stages.In early stage of aging,the crosslink density of molecular chains rise,crystallinity improve with the secondary crystallization accumulation,the degradation rate is slow.In middle stage of aging,crosslinking and degradation reaction co-existed,light diffusing agent falls off from the interface and causes the film surface to break,the continuity of crystallization chains distribution decrease,the degradation rate is moderate.In later stage of aging,the degradation of the molecular main chain intensifies,film breakages extend to the depth,mechanical properties rapidly degrade to complete aging.The study shows that light diffusion agent can effectively improve haze and realize diffused light control without affecting the macro function and aging degradation performance of PE-LLD shed film.
linear low density polyethylenelight-diffusingxenon lamp accelerated agingproperty variationbehavior and mechanism
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