Abstract
Based on the improved performance by interface construction, poly-lactic acid (PLA)/biomass composites have attracted much attention and received wide application as a completely degradable material. This work aims to study the effect of biomass components and the designed interface on the photo-degradation behavior of PLA/biomass composites exposed to the simulated sunlight irradiation, which could further alleviate the restriction caused by the poor ultraviolet (UV) stability of PLA. The biomass shows a significant delay effect in the degradation rate of the PLA matrix by the absorption of visible and UV ranges, acting as a photo-oxidative stabilizer during the irradiation. The investigation of the surface chemical changes reveals a dual mechanism for the degradation of the composites, consisting of a typical Norrish II photochemical and photo-oxidation mechanism. The interface in the composites is constructed by the surface treatment of biomass through the in situ polymerization of lactic acid, which could effectively alleviate the shielding effect of biomass. In our view, this work provides a novel strategy to prepare the PLA/biomass composites that possessed excellent photo-oxidative stabilization provided by biomass, adjustable degradation cycle offered by the interface construction, and potential application in more advanced packaging and agriculture fields.
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