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10 de dic. de 2022 · Relative to photo-oxidation, biodegradation is much slower and is not thought to remove plastics from the environment in a readily observable timescale. Solar UV radiation is thus the primary factor that drives generation of MP fragments.
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1. Introduction. The first reports of plastics litter in the...
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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.
10 de feb. de 2021 · UV degradation of natural and synthetic microfibers causes fragmentation and release of polymer degradation products and chemical additives - ScienceDirect. Science of The Total Environment. Volume 755, Part 2, 10 February 2021, 143170.
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 ...
In polymer chemistry photo-oxidation (sometimes: oxidative photodegradation) is the degradation of a polymer surface due to the combined action of light and oxygen. [1] It is the most significant factor in the weathering of plastics. [2]
Ultraviolet rays interact with these bonds to form free radicals, which then react further with oxygen in the atmosphere, producing carbonyl groups in the main chain. The exposed surfaces of products may then discolour and crack, and in extreme cases, complete product disintegration can occur.
