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Unveiling the degradation dynamics of packaging plastics: Insights into the onset of microplastics formation through photodegradation
Summary
Scientists exposed common plastic packaging (like water bottles and food containers) to simulated sunlight to see how quickly it breaks down into microplastics, tiny plastic fragments that can end up in our food, water, and bodies. They found that thin plastic films can lose half their weight to degradation in as little as 1.4 years, with some plastics (PET) starting to break down after just 100 hours of light exposure. This matters because it shows how quickly everyday packaging can shed microplastics into the environment, reinforcing concerns about how much of this material we may be exposed to through contaminated food and water.
The persistence of plastic packaging, combined with limited recycling and predominant disposal, accelerates its transformation into microplastics. Yet the mechanisms underlying this transition remain insufficiently understood despite rising concern over environmental and health impacts. In this study, packaging plastics (PET, PP, and HDPE) were subjected to 0 to 1000 h of simulated natural photodegradation to determine the critical onset of microplastic formation. Comprehensive characterization, including Fourier Transform Infrared Spectroscopy, Raman spectroscopy, 3D Laser Scanning Confocal Microscope, Field-Emission Scanning Electron Microscope, colorimetric analysis, and tensile testing, was employed to assess physical, chemical, optical, and mechanical changes. The results revealed that the surface morphology of PET, PP, and HDPE significantly changes after 100, 750, and 1000 h of exposure, respectively, which is supported by the carbonyl index value. The weight loss due to degradation follows a linear progression for PET (R 2 =0.9516), PP (R 2 =0.9707), and HDPE (R 2 =0.9601), providing an indicator of microplastic formation. The degradation was assessed to be thickness-dependent, with 0.3 mm films losing 50% weight within 1.43 years, indicating accelerated microplastic generation. The findings reveal key insights into the transition from plastics to microplastics, providing valuable recommendations for mitigating microplastic formation and reducing the environmental impact of packaging materials.