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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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Simulation Framework for the Chemical Degradation in Polymeric Solids.

K Steiakakis1,2, G G Vogiatzis3,2, L C A van Breemen1,4

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This study introduces a new computational framework to understand plastic chemical aging. It models degradation as atomistic transitions, revealing how the polymer

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Polymer Science

Background:

  • Chemical aging kinetics in plastics are poorly understood due to experimental and computational limitations.
  • Dense polymeric solids hinder in situ investigation of degradation.
  • Traditional methods cannot reach the time scales of slow degradation reactions.

Purpose of the Study:

  • To develop a novel mechanistic framework for studying chemical aging in amorphous solids.
  • To investigate the autoxidation of glassy polystyrene using this new approach.
  • To understand the impact of the local dense environment on solid-state reaction kinetics.

Main Methods:

  • Describing infrequent reaction events as elementary transitions between local energy landscape minima.
  • Identifying transition states to estimate free-energy barriers and rate constants via transition state theory.
  • Employing a trained reactive force field (ReaxFF-lg/CHOpox) for large-scale in situ sampling of reaction paths.

Main Results:

  • A network of states representing stationary states along chemical paths was generated.
  • Energetics and rates of elementary reactions in glassy polystyrene autoxidation were extracted.
  • A broad distribution of free-energy barriers was observed, indicating significant environmental impact on kinetics.

Conclusions:

  • The novel framework enables in situ study of solid-state reaction kinetics.
  • Local dense environments profoundly influence polymer degradation rates.
  • Understanding these effects is crucial for predicting plastic longevity and designing more stable materials.