Dec 12, 2019 · As ultraviolet (UV) radiation consists of photons with high energy relative to visible light, it can cause degradation in the form of physical and chemical changes in susceptible materials.

Jul 19, 2024 · What Does UV Degradation Mean? UV degradation refers to the cracking or disintegration of materials exposed to ultraviolet radiation, most commonly due to sunlight exposure.

Photo-oxidation is a form of photodegradation and begins with formation of free radicals on the polymer chain, which then react with oxygen in chain reactions. For many polymers the general autoxidation mechanism is a reasonable approximation of the underlying chemistry.

UV radiation causes photooxidative degradation which results in breaking of the polymer chains, produces free radical and reduces the molecular weight, causing deterioration of mechanical properties and leading to useless materials, after an unpredictable time.

Feb 10, 2021 · Most polymer products break down slowly through a combination of environmental processes, but UV degradation can be a significant source of degradation. The current study aimed to investigate the effect of UV irradiance on the degradation of natural (wool) and synthetic (PET and PA) MFs.

FT-IR analyses showed that, after an 800-h UV radiation, an advanced UV degradation step occurred in the epoxy system without Tinuvin 1130, leading to formation of carboxylic acids. However, in the presence of Tinuvin 1130, UV damage could not progress well and it remained at the early stages.

Aug 1, 2018 · In particular, we are showing (1) how to properly simulate UV damage on wavy polymer surfaces typical for unidirectional composites, (2) how to predict UV degradation rates of polymers, in general, and (3) how the surface topographies of …

Feb 5, 2025 · This study investigates the effects of ultraviolet (UV) exposure on indoor building materials, focusing on color change, surface degradation, and chemical composition alterations. UV-exposed materials, quantitatively assessed using RGB and HSL color models, demonstrated progressive yellowing.

In this study, low-density polyethylene (LDPE) was exposed to an ultraviolet (UV) fluorescence lamp in simulated aging and degradation experiments. Ultraviolet degradation mechanisms were investigated on the surface after sunlight and UV lamp exposure.

The molecular makeup of certain materials can become damaged if those materials are not resistant to UV rays. The chain of molecules will begin to break down, causing both physical and chemical changes. This damage, called UV degradation, affects many natural and synthetic polymers including some rubbers, neoprene and polyvinyl chloride (PVC ...