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Solid-state thermal aging promotes mechanical fragmentation and microplastic release in polypropylene
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Everyday heat exposure—like leaving plastic containers in a hot car or storing them near appliances—can weaken polypropylene plastic even without sunlight, making it much easier to crumble into tiny microplastic particles when handled or rubbed. In this study, plastic aged at higher temperatures for longer released far more microplastics once physically disturbed, meaning common heat exposure could be quietly setting up plastic products to shed more particles into our food, water, and environment.
The environmental persistence of polypropylene (PP) has raised growing concern regarding its transformation into microplastics under environmentally relevant conditions. While photodegradation has been extensively studied, the role of solid‑state thermal aging under dry, sub‑melting conditions in preconditioning PP for microplastic formation remains less explored. This study systematically investigates how solid‑state thermal aging under controlled dry, atmospheric‑oxygen conditions alters PP structural integrity and how subsequent mechanical fragmentation governs microplastic release. PP specimens were thermally aged at 80 °C, 100 °C, and 120 °C for up to 350 h, followed by controlled mechanical agitation at 100, 500, and 1000 rpm in deionized water. Fourier Transform Infrared spectroscopy (FTIR) and Scanning Electron Microscopy (SEM) revealed thermally induced chain scission, structural weakening, and surface embrittlement, with limited detectable oxidative functionalization. Gravimetric analysis and micro-FTIR particle identification confirmed time and temperature-dependent microplastic release, with maximum mass loss of 12,800 ± 595 mg/kg at 120 °C after 350 h at 1000 rpm. A strong correlation was observed between mass loss and microplastic particle count, while particle size analysis indicated a dominance of microplastics of <200 µm in size. These findings demonstrate that solid‑state thermal aging acts as a critical preconditioning step that enhances mechanically driven fragmentation, even under limited oxidation, facilitating enhanced microplastic release.
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Investigation of the impact of microwave treatment on the aging of polypropylene microplastics
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This study investigated how microwave heating of plastic food containers affects polypropylene microplastic properties, including surface chemistry and fragmentation potential. Microwave treatment altered the aging state of polypropylene particles, suggesting that routine kitchen use of plastic containers accelerates the release of microplastics into food.
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Researchers measured how quickly polypropylene plastic breaks down into micro and nanoplastics under simulated sunlight over a period equivalent to about 2.7 years outdoors. They found that additives in plastic initially slow fragmentation but that mechanical stress plays a major role in producing microplastics. The study provides valuable data on how everyday plastics generate huge numbers of tiny particles as they weather in the environment.
Investigation of the impact of microwave treatment on the aging of polypropylene microplastics
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This study investigated how microwave heating affects polypropylene microplastics used in common food containers, examining changes in surface chemistry, fragmentation, and potential additive release under typical household cooking conditions. Microwave treatment accelerated aging and altered particle properties of polypropylene microplastics, suggesting routine microwave use of plastic containers promotes microplastic release into food.
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