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10 de dic. de 2022 · UV-driven plastic degradation varies between locations and environments. •. Knowledge gaps exist on wavelength sensitivity and dose-response of degradation. Understanding the fate of plastics in the environment is of critical importance for the quantitative assessment of the biological impacts of plastic waste.
23 de ago. de 2013 · Exposure to ultraviolet (UV) radiation may cause significant degradation of many materials. UV radiation causes photooxidative degradation which results in breaking of the polymer chains, produces radicals and reduces the molecular weight, causing deterioration of mechanical properties and leading to useless materials, after an ...
UV-radiation and oxygen are the most important factors that initiate degrdn. of polymers with a carbon-carbon backbone, leading to chain scission. Smaller polymer fragments formed by chain scission are more susceptible to biodegrdn. and therefore abiotic degrdn. is expected to precede biodegrdn.
1 de abr. de 2021 · UV radiation is mainly responsible for the initiation of degradation. Many advanced technologies have been developed to characterize the degradation of plastics. Degradation causes oxidation and chain-scission of plastic polymers, forming low molecular weight degradation products and causing changs in physicochemical and mechanical properties.
21 de mar. de 2024 · Plastic waste that is exposed to solar UV radiation will photo-oxidise and gradually degrade into microplastic (< 5 mm) and nanoplastic (< 0.1 µm) particles. Such particles are now ubiquitous in the environment and have been discovered in freshwater and marine systems, soils and the atmosphere across diverse geographical regions.
1 de ago. de 2018 · UV radiation causes photooxidative aging, which results in the breakage of polymer chains, produces free radicals and reduces the molecular weight of polymers, resulting in a loss of surface gloss and the significant deterioration of many material properties with time.
This current quadrennial assessment provides a comprehensive update on the deleterious effects of solar UV radiation on the durability of natural and synthetic materials, as well as recent innovations in better stabilising of materials against solar UV radiation-induced damage.
