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A review on photochemical effects of common plastics and their related applications
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This review examines how sunlight triggers photochemical reactions in seven common plastics, altering their physical and chemical properties and accelerating their degradation into smaller particles and dissolved organic compounds. The review also discusses how these photochemical effects can be harnessed for useful applications like light-responsive materials, while noting that in most environmental contexts they worsen plastic pollution by generating microplastics and nanoplastics. Understanding these reactions is key to predicting the environmental fate of plastic debris and designing cleaner plastic management strategies.
Abstract The photochemical effects of plastics refer to a series of photochemical reactions of plastics under certain illumination conditions. In order to help researchers understand the research progress of photochemical effects of plastics, we will introduce photochemical effects of seven common plastics and discuss the influence of functional groups of polymers in plastics on the photochemical effects of plastics in this review. Based on this, we discuss the impact of photochemical effects on the properties of plastics and some factors affecting the surface photochemical effects of plastics. Last but not least, although in most cases the photochemical effects of plastics are extremely detrimental to the control of plastic pollution, some applications based on the photochemical effects of plastics will also be introduced in this review. It is believed that this review can provide some new ideas for the development of new and clean processes and some promising materials such as light‐responsive materials.
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This chapter detailed the photodegradation mechanisms by which UV radiation breaks polymer chains in common plastics, progressively generating smaller microplastic and nanoplastic fragments without eliminating the material from the environment. Understanding these photochemical pathways clarifies why sunlight-exposed plastic waste — in oceans, soils, and landfills — continuously generates new microplastic particles that accumulate in ecosystems and food chains.
Study on the impact of photoaging on the generation of very small microplastics (MPs) and nanoplastics (NPs) and the wettability of plastic surface
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Experiments using UV light to artificially age six common plastic types showed that sunlight (photoaging) accelerates the breakdown of plastics into very small microplastics and nanoplastics and makes plastic surfaces rougher and more chemically reactive. Understanding how different polymer structures respond to light aging is important for predicting which plastics will fragment fastest in the environment and generate the most hazardous small particles.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.