Wood plastic composites weathering: Visual appearance and chemical changes

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Monitoring Wood Degradation during Weathering by Cellulose Crystallinity (2012, background): “They found an increasing concentration of both esters at 1735 cm and carboxylic acid at 1715 cm upon xenon-arc and UVA weathering, while with longer exposure time, these concentrations began to decrease [32].”
A review on the degradability of polymeric composites based on natural fibres (2013, background): “[57] where strong correlations between lightness and wood lignin degradation, lightness and carboxylic acid concentration, and lightness and esterification were observed.”
Ultraviolet weathering of HDPE/wood-flour composites coextruded with a clear HDPE cap layer (2011, background): “Several authors have correlated the increased integrated area or peak height of this band and carbonyl index with the oxidative photodegradation of polymer [45,46], wood [15e17], and woodeplastic composites [9,10,14] due to the presence of oxygenated products.”