We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
How Sunlight Transforms Polyethylene and Promotes Microplastic Formation from Greenhouses
AI summary Read the abstract
Researchers tested plastic greenhouse film (polyethylene) by leaving it outdoors in Ecuador for up to 342 days and separately exposing it to UV light in the lab for up to 579 hours. Both methods showed increasing chemical breakdown, surface damage, and cracking over time, suggesting a process that leads to fragmentation into microplastics. The study also estimated how much greenhouse film waste Ecuador might generate yearly.
Linear low-density polyethylene (LLDPE) is widely used in agricultural films, packaging, and everyday products. Although it may appear stable, ultraviolet (UV) radiation, oxygen, moisture, and temperature fluctuations can progressively alter its structure. This article explains how LLDPE films age and how chemical oxidation, molecular rearrangement, surface damage, and embrittlement can promote fragmentation and microplastic formation. The underlying study compared outdoor weathering in Urcuqu´ı, Ecuador, for up to 342 days with controlled irradiation at 365 nm using a 50-W LED for up to 579 hours. ATR-FTIR tracked oxidation through the carbonyl index, Raman spectroscopy monitored conformational changes, and scanning electron microscopy (SEM) documented surface defects. The carbonyl index increased from approximately 0.03 to 0.22 after 342 days outdoors, compared with approximately 0.08 after 400 hours under controlled UV exposure. Defective surface area also increased under both conditions. These findings support a coupled degradation process involving oxidation, chain scission, structural rearrangement, and surface embrittlement. The article also discusses greenhouse-plastic waste management in Ecuador and presents a qualified, order-of-magnitude estimate of potential annual film replacement. The estimate is not an official waste inventory; it illustrates why timely removal, collection, and recycling of aged films are important.
More Papers Like This
Changing characteristics of microplastics during the aging process of polyethylene film
AI summary Read the abstract
This review paper examines how most microplastics in the environment form: plastic materials break down into small particles over time. It focuses on how sunlight (UV light) damages polyethylene plastic film, showing that its physical and chemical properties change the longer it is exposed.
The characteristic change of plastic film from common used packing bags under UV photodegradation
AI summary Read the abstract
Researchers studied how UV light degrades plastic packaging films over time, finding that photodegradation causes surface cracking and chemical changes that progressively break plastic into smaller fragments, including microplastics. The findings help explain how discarded plastic packaging contributes to microplastic accumulation in the marine environment.
Influence of weathering on the microplastics formation in the environment
AI summary Read the abstract
Researchers simulated UV weathering of polypropylene plastic and tracked how exposure progressively degraded the polymer, causing surface cracking and changes in mechanical properties that facilitate breakdown into microplastics. The results help explain how environmental weathering of plastic waste accelerates microplastic formation.
Microplastics Generation: Onset of Fragmentation of Polyethylene Films in Marine Environment Mesocosms
AI summary Read the abstract
Researchers investigated how high-density polyethylene films from plastic bags fragment into microplastics under simulated beach and nearshore conditions over six months. The study found that natural sunlight exposure on sand or in seawater caused measurable degradation, providing evidence for how everyday plastic bags break down into microplastic particles in marine environments.
A method for measuring the emissions of in situ agricultural plastic film microplastics by ultraviolet and mechanical abrasion
AI summary Read the abstract
Researchers developed a method to measure in situ microplastic emissions from agricultural plastic films under combined UV and mechanical abrasion, providing the first quantitative approach to assess how field conditions cause polyethylene and PVC films to fragment into microplastics.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.