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Papers
61,005 resultsShowing papers similar to Polypropylene Contamination in Post-Consumer Polyolefin Waste: Characterisation, Consequences and Compatibilisation
ClearAssessment of the Impact of Superficial Contamination and Thermo-Oxidative Degradation on the Properties of Post-Consumer Recycled Polypropylene
This study investigated how surface contamination and thermo-oxidative degradation during repeated use affect the mechanical and chemical properties of post-consumer recycled polypropylene, finding that these degradation processes significantly reduce material quality and pose challenges for achieving high-quality recycled plastic products.
Morpho-structural and thermo-mechanical characterization of recycled polypropylene and polystyrene from mixed post-consumer plastic waste
Researchers characterized recycled polypropylene and polystyrene recovered from mixed post-consumer plastic waste, assessing their morphological, structural, and thermo-mechanical properties to evaluate suitability for reuse in manufacturing.
Recycling of Polypropylene Recovered from a Composting Plant: Mechanical Behavior of Compounds with Virgin Plastic
Not directly relevant to microplastics — this paper investigates mechanical recycling of polypropylene recovered from a composting plant's waste stream, focusing on material properties after reprocessing.
Material Characterizations of the Polymers Reinforced with Recycled Flexible Plastic Blends as Filament for 3D Printing
Researchers characterized polymer blends made from recycled flexible plastics mixed with high-density polyethylene and polypropylene for use as 3D printing filaments. The study found that incorporating recycled plastic into filament materials is technically feasible, offering a potential pathway to reduce plastic waste by converting single-use plastics into useful manufacturing materials.
Properties of Simulated Plastic Waste Mixtures in Upcycling Processes: An Experimental Evaluation
This study evaluated the mechanical and thermal properties of ternary and quaternary blends of low-density polyethylene and polypropylene to simulate mixed plastic waste, finding that blend composition significantly affects material quality and identifying optimal formulations for upcycling processes.
Microplastic occurrence during the pre-treatment of polypropylene in a simulated washing process for mechanical recycling
This study investigated microplastic emissions during the washing of post-consumer polypropylene plastic waste as part of mechanical recycling pre-treatment. Washing generated measurable microplastic particles, with higher temperatures and longer contact times increasing emissions — a finding relevant to understanding recycling facilities as potential microplastic pollution sources.
Jätemuovi näytteiden koostumusanalyysi
Researchers performed comprehensive compositional analysis of waste plastic samples — including mechanically recycled reject, rigid polyolefin waste, and waste from electrical and electronic equipment — using DSC, NIR, FT-IR spectroscopy, XRF, and TGA. Results revealed a diverse polymer mix in mechanically recycled reject, a homogeneous polyolefin composition suitable for straightforward recycling, and a complex multi-material blend in electronic waste requiring more sophisticated recycling strategies due to flame retardants and other additives.
Sistemas de revalorización de poliolefinas procedentes de residuos sólidos urbanos
This Spanish thesis examined systems for recovering and reusing polyolefin plastics from municipal solid waste, evaluating mechanical and chemical recycling approaches. Improving plastic recovery rates reduces the volume of plastic waste that eventually fragments into microplastics in landfills and the environment.
Microplastics identification and quantification in the composted Organic Fraction of Municipal Solid Waste
Researchers quantified microplastics in composted organic municipal solid waste from five facilities, finding contamination levels that raise concerns about compost quality and the potential transfer of microplastics to agricultural soils through organic waste recycling.
Non-Wettable Microporous Sheets Using Mixed Polyolefin Waste for Oil–Water Separation
Not relevant to microplastics — this paper describes manufacturing non-wettable porous sheets from recycled polyethylene and polypropylene waste for oil-water separation, focusing on materials recycling rather than microplastic pollution.
Towards sustainable plastics recycling: assessing the integrity status of polypropylene (PP) debris to recycle marine-degraded materials
Researchers assessed marine-degraded polypropylene (PP) debris from coastal environments using FTIR spectroscopy and tensile testing, classifying debris by integrity, then blending degraded PP with virgin PP to produce recyclable specimens that retain acceptable mechanical properties. The work shows that even environmentally weathered plastic — a significant source of microplastic fragments — can be recycled with quality outcomes, offering a route to reduce ongoing fragmentation.
Experimental Study of the Impact of Trace Amounts of Acetylene and Methylacetylene on the Synthesis, Mechanical and Thermal Properties of Polypropylene
Researchers found that trace amounts of acetylene and methylacetylene impurities in propylene feedstock affect polypropylene synthesis productivity and alter the mechanical and thermal properties of the resulting polymer, with implications for quality control in industrial plastic production.
Mechanical recycling of plastic waste as a point source of microplastic pollution
Researchers found that mechanical recycling of plastic waste is a significant point source of microplastic pollution, releasing plastic fragments into wastewater during washing, shredding, and processing stages of the recycling chain.
Quantity and Material Composition of Foreign Bodies in Bio-Waste Collected in Towns from Single- and Multi-Family Housing and in Rural Areas
Researchers characterized the quantity and composition of foreign bodies, including plastics, in bio-waste collected from households across multiple German cities, finding significant contamination that complicates composting and recycling operations.
Assessment of Co-Pyrolysis of Polypropylene with Triacylglycerol-Based Waste Biomass to Obtain Sustainable Hydrocarbons
Despite its title referencing polypropylene co-pyrolysis, this paper studies the thermal breakdown of polypropylene plastic waste combined with biodiesel industry byproducts to produce renewable hydrocarbon fuels — not microplastic pollution. It examines chemical product yields from waste-to-fuel conversion, and is not relevant to microplastics or human health.
Process Optimization of Solvents Assisted Polyethylene Waste Recycling
Researchers optimized solvent-based chemical recycling of polyethylene plastic waste to recover high-quality recycled material. The study demonstrates that chemical recycling can be tuned to maximize yield and quality, offering a scalable alternative to mechanical recycling that degrades plastic properties over time.
Exploring the EU plastic value chain: A material flow analysis
Researchers conducted a material flow analysis of the EU27 plastic value chain, finding that only 19% of plastics were recycled in 2019, with total losses amounting to 4% of production and significant variation across sectors and polymer types.
Approaches for Management and Valorization of Non-Homogeneous, Non-Recyclable Plastic Waste
This review examined management and valorization strategies for non-homogeneous, non-recyclable plastic waste, evaluating chemical recycling, energy recovery, and upcycling approaches as pathways to reduce environmental plastic accumulation and recover value from difficult-to-process waste streams.
Plastic waste management in recycling facilities: Intentionally generated MPs as an emerging contaminant
Researchers characterized microplastic pollution in wastewater from four plastic recycling facilities in Turkey, finding that the recycling process itself generates significant quantities of microplastics. The dominant polymers detected were polyethylene and polypropylene, matching the materials being processed. The study suggests that plastic recycling facilities are an overlooked source of microplastic contamination and that better wastewater treatment at these sites is needed.
The mitigation of the ghost nets threat by recycling of polypropylene: Blends, their ageing tests and spectral characterization
Researchers developed a method to recycle polypropylene plastic from abandoned fishing nets — a major source of ocean microplastics — by blending recycled fibers with fresh plastic and testing the resulting material in simulated seawater. The recycled blends held up as well as new plastic, suggesting ghost net recycling is a practical strategy to reduce marine microplastic pollution.
Challenges and Opportunities for Recycled Polyethylene Fishing Nets: Towards a Circular Economy
Researchers examined the challenges of recycling polyethylene from discarded fishing nets, finding that contaminants and degradation during the nets' service life significantly reduce the mechanical properties of recycled resins. The study explores strategies to improve recycled fishing net polyethylene quality and advance circular economy approaches for marine plastic waste.
Separation and Characterization of Plastic Waste Packaging Contaminated with Food Residues
This paper is not directly about microplastic pollution impacts — it develops a processing technology to separate food residues from plastic packaging waste, producing a fraction of mixed microplastics as a byproduct, with the primary aim of improving plastic recyclability.
Elaborating more realistic model microplastics by simulating polypropylene's environmental ageing
This study developed more realistic model microplastics by simulating the environmental aging of polypropylene, producing laboratory particles with surface chemistry, roughness, and density closer to field-collected environmental microplastics.
Recycled Mixed Plastic Fine Aggregate in Cement Concrete
Cement concrete mixtures incorporating mixed post-consumer recycled plastic as fine aggregate were characterized, finding that an optimized blend of polymer types produced workable concrete with mechanical properties suitable for construction applications.