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Microplastic Index—How to Predict Microplastics Formation?
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Researchers developed a Microplastic Index that predicts how likely different types of plastic are to break down into microplastics based on their mechanical and physical properties. Softer, more flexible plastics scored higher, meaning they fragment more easily under environmental stress. This tool could help manufacturers and policymakers choose materials that are less prone to generating microplastic pollution.
The presence of microplastics in environmental compartments is generally recognized as a (potential) health risk. Many papers have been published on the abundance of microplastics at various locations around the globe, but only limited knowledge is available on possible mitigation routes. One of the mitigation routes is based on the choice of plastic materials used for products that may unintentionally end up in the environment. As a first approach, this paper presents a method to calculate the tendency of polymers to form microplastics, based on their mechanical and physical properties. A MicroPlastic Index (MPI) that correlates the microplastic formation to polymer properties is defined for both impact and wear of polymers via a theoretical particle size and the energy required to form these particles. A first comparison between calculated and experimental particle size is included. The MPI for impact and wear follow the same trend. Finally, these MPIs are correlated to the respective abundance of the microplastics in the environment, corrected for global production of the corresponding polymers: the higher the MPI, the more microplastics are found in the environment. Thus, the MPI can be used as a basis for choice or redesign of polymers to reduce microplastic formation.
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Experimental Validation of the Microplastic Index—Two Approaches to Understanding Microplastic Formation
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Researchers experimentally validated the Microplastic Index (MPI) model using ten polymers subjected to milling and sanding experiments, finding that the model accurately predicted microplastic particle sizes ranging from 0.3 to 200 µm, with brittle polymers producing smaller particles and ductile polymers producing larger ones.
Environmental degradation and fragmentation of microplastics: dependence on polymer type, humidity, UV dose and temperature
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Researchers systematically tested how UV light, temperature, and humidity cause five common plastic types to break apart into secondary microplastics and nanoplastics. They found that the type of plastic — not the aging conditions — was the main factor determining how quickly it fragmented and what byproducts it released, data that can improve models predicting how plastics break down in the environment.
Microplastics: From Intrinsic Properties to Environmental Fate
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This review examines how the built-in properties of plastics — their chemical structure, additives, and molecular weight — determine how quickly they break down in the environment and what happens when they do. As microplastics degrade, they fragment into even smaller particles that may be more harmful because they can more easily enter living organisms. Understanding these degradation pathways is essential for predicting the long-term environmental and health risks of plastic pollution.
Ranking of potential hazards from microplastics polymers in the marine environment
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Researchers developed a model to rank which types of microplastic polymers pose the greatest health risk from marine exposure pathways, based on their chemical toxicity when broken down and their particle size. Polyurethane, PVC, and polyacrylonitrile ranked as the most hazardous, while the toxicity of the broken-down chemical components was the single biggest factor in determining risk. This ranking system could help policymakers prioritize which plastic types to regulate first to protect human health.
Assessing Plastic Brittleness to Understand Secondary Microplastic Formation on Beaches: A Hotspot for Weathered Marine Plastics
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Researchers tested the brittleness of plastic debris collected from Hawaiian beaches, finding that highly degraded polyethylene and polypropylene fragments have extremely low molecular weight and show signs of advanced oxidation, making them prone to breaking into even smaller microplastics. The study quantifies how beach plastics become increasingly fragile over time, highlighting beaches as important hotspots where large plastic pollution transforms into harder-to-remove microplastic particles.
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