The efficacy of photostabilizers on the color change of wood filled plastic composites

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Ultraviolet weathering of HDPE/wood-flour composites coextruded with a clear HDPE cap layer (2011, background): “Muasher and Sain also investigated the discoloration of HDPEbased WPCs exposed to natural weathering and reported that WPCs underwent two competing redox reactions upon UV exposure: the formation of paraquinone chromophoric structures generated by the oxidation of lignin, resulting in yellowing, as ”
Structural Changes in Wood under Artificial UV Light Irradiation Determined by FTIR Spectroscopy and Color Measurements – A Brief Review (2013, methodology): “It has been shown that the degradation process is triggered by the formation of free radicals by UV irradiation (Moore and Owen 2001; Müller et al. 2003).”