Physical Morphology and Quantitative Characterization of Chemical Changes of Weathered PVC/Pine Composites |
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Authors: | James S Fabiyi Armando G McDonald |
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Institution: | (1) Department of Forest Products, University of Idaho, Moscow, ID 83844-1132, USA; |
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Abstract: | This study investigated weathering effects on polyvinyl chloride (PVC) based wood plastic composites (WPC), with a focus on
the color and structure that is attributed to the material composition. It is directed towards quantifying the main chemical
modifications, such as carbonyl and vinyl groups which are formed during weathering. These composites were subjected to three
weathering regimes: exterior, accelerated xenon-arc, and accelerated UVA. The change in color was monitored using colorimetry.
Fourier transform infrared spectroscopy was used to identify and quantify the chemical modifications (carbonyl formation and
vinyl propagation) due to weathering. Additionally, scanning electron microscopy was employed to observe the physical morphological
changes that occurred. The results showed that exterior and accelerated xenon-arc and UVA weathering regimes increased the
degree of lightness, total color change, carbonyl concentration, and wood loss on the surfaces of the weathered composites.
The increased carbonyl concentration during weathering implied that degradation had occurred by oxidation process. Also, oxidation
and lignin (from the wood) degradation influenced the color (lightness) of PVC based WPC upon weathering. |
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