Polymer Weathering: Photo-Oxidation

By D. Feldman. 2002

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Photodegradation and photostabilization of polymers, especially polystyrene: review (2013, positive): “On exposure to light, these ketone groups absorb photons of appropriate energy, break carbon–carbon bonds, and scission the polymer backbone (Rabek 1995; Feldman 2002) as shown in the Figures 3 and 4 (Grassie and Scott 1985):”
Crack Damage in Polymers and Composites: A Review (2016, background): “PVC that has been processed for long periods and/or high temperature demonstrates less resistance to UV damage.(108) This may be due to the increase in the degree of degradation of macromolecular compounds as a result of processing temperature and time.”
Cracks, microcracks and fracture in polymer structures: Formation, detection, autonomic repair (2016, background): “PVC that has been processed for long periods and/or high temperature demonstrates less resistance to UV damage [10].”
An overview of degradable and biodegradable polyolefins (2011, background): “these groups absorb photons of appropriate energy, break carbon-carbon bonds and scission the polymer backbone into smaller fragments.[2]”
Hydrophilic and hydrophobic materials and their applications (2018, background): “The exposure of the polymer to UV radiation ultimately results in making the surface more hydrophilic due to the chain scission, crosslinking, and increases the density of oxygen-based polar groups (Feldman 2002; Hozumi et al. 2004; Shyichuk et al. 2005; White and Shyichuk 2007).”