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Related Concept Videos

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Bioplastics

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Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...
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Polyethylene terephthalate (PET) is a synthetic polymer widely utilized in the packaging industry, particularly for bottles and containers. Due to its chemical stability and durability, PET accumulates in the environment, contributing significantly to plastic pollution. It comprises repeating units of terephthalic acid and ethylene glycol, resulting in a semi-crystalline structure that is resistant to natural degradation processes.A notable breakthrough in plastic biodegradation came with the...
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A Unified Framework for Simulating Aging Process of Typical Microplastics.

Xing Yang1, Binxin Fan2, Chunqiong Liu3

  • 1College of Environmental Sciences and Engineering, China West Normal University, Nanchong, 637009, China.

Environmental Pollution (Barking, Essex : 1987)
|October 22, 2025
PubMed
Summary
This summary is machine-generated.

Quantifying microplastic (MP) aging is crucial for assessing ecological risks. This study developed a novel aging index (Fz) to measure MP aging, revealing distinct aging patterns for PVC and PLA materials.

Keywords:
Aging degreeFrenkel-Halsey-Hill modelMicroplasticsMultifractal detrended fluctuation analysisPrincipal component analysis

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Area of Science:

  • Environmental Science
  • Materials Science
  • Polymer Chemistry

Background:

  • Natural aging significantly alters microplastic (MP) toxicity and pollutant absorption.
  • Quantitative methods for assessing MP aging are lacking, hindering ecological risk evaluation.

Purpose of the Study:

  • To develop quantitative techniques for describing the aging degree of microplastics.
  • To establish aging kinetics models for different MP types.

Main Methods:

  • Aging experiments and characterization of polyvinyl chloride (PVC) and polylactic acid (PLA) microplastics.
  • Multifractal detrended fluctuation analysis and Frenkel-Halsey-Hill model for morphological and pore structure analysis.
  • Principal component analysis to develop a comprehensive aging index (Fz).

Main Results:

  • Aged MPs exhibit increased surface roughness and spatial heterogeneity.
  • Aging promotes mesopore development in both PVC and PLA, with more significant micropore increase in PLA.
  • A linear aging index (Fz) was developed, demonstrating a steady aging process.
  • Aging kinetics models revealed a slightly higher aging rate constant for PLA, indicating greater degradability.

Conclusions:

  • The developed aging index (Fz) provides a quantitative measure of microplastic aging.
  • Distinct aging characteristics and rates were observed for PVC and PLA.
  • This work is vital for assessing the ecological risks posed by aged microplastics in natural environments.