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Changes in the Chemical Composition of Polyethylene Terephthalate Under UV Radiation in Various Environmental Conditions.
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Researchers studied how UV radiation degrades PET plastic under varying humidity (dry vs. saturated) and temperature (30-50 degrees C) conditions for up to 20 days. High humidity and elevated temperature significantly accelerated ester bond cleavage and carboxylic acid formation, key chemical changes that produce micro-nano plastics.
Polyethylene terephthalate has been widely used in the packaging industry. Degraded PET micro-nano plastics could pose public health concerns following release into various environments. This study focuses on PET degradation under ultraviolet radiation using the NIST SPHERE facility at the National Institute of Standards and Technology in saturated humidity (i.e., ≥ 95 % relative humidity) and dry conditions (i.e., ≤ 5 % relative humidity) with varying temperatures (30 °C, 40 °C, and 50 °C) for up 20 days. ATR-FTIR was used to characterize the chemical composition change of degraded PET as a function of UV exposure time. The results showed that the cleavage of the ester bond at peak 1713 cm and the formation of the carboxylic acid at peak 1685 cm are significantly influenced by UV radiation. Furthermore, the formation of carboxylic acid was considerably higher at saturated humidity and 50 °C conditions compared to dry conditions. The ester bond cleavage was also more pronounced in saturated humidity conditions. The novelty of this study is to provide insights into the chemical degradation of PET under environmental conditions, including UV radiation, humidity, and temperature. The results can be used to develop strategies to reduce the environmental impact of plastic pollution.
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Changes in the Chemical Composition of Polyethylene Terephthalate under UV Radiation in Various Environmental Conditions.
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Researchers exposed polyethylene terephthalate (PET) to UV radiation under controlled humidity conditions and tracked changes in its chemical composition, finding progressive oxidation and chain scission that alter the polymer's surface properties. Understanding how PET degrades under UV exposure is important for predicting how PET microplastics form and what chemical changes make them more or less bioavailable.
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Researchers tested how sunlight, water, and physical wear work together to break down PET microplastics, the type commonly found in plastic bottles and food packaging. Over 60 days, combined UV light and water exposure caused significant chemical degradation of the plastic surfaces. This matters because as microplastics break down in the environment, they release smaller fragments and potentially harmful chemicals that are easier for organisms to absorb.
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UV radiation was shown to degrade polypropylene and PET plastic packaging materials, causing surface changes and potential microplastic formation, with degradation rates influenced by sample shape and size. These findings are relevant to understanding how discarded plastic packaging breaks down in marine and outdoor environments.
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Researchers used an accelerated weathering device to study how UV light, temperature, and humidity break down PET plastic into microplastic particles. Higher UV intensity and temperature dramatically increased the number of microplastics produced, while humidity had a lesser effect. This research helps predict how quickly everyday plastics become microplastics under real-world environmental conditions, especially in sunny and warm climates.
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