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Addressing diffusion behavior and impact in an epoxy-amine cure system using molecular dynamics simulations.

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Molecular dynamics simulations reveal how temperature and crosslinking conversion affect the diffusion of epoxy resin components. Higher temperatures enhance molecular mobility, while increasing crosslinking restricts diffusion, crucial for understanding material properties.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Chemical Engineering

Background:

  • Understanding diffusion-controlled crosslinking is vital for optimizing thermoset polymer properties.
  • Epoxy resins are widely used in advanced composites and adhesives, necessitating detailed studies of their curing behavior.

Purpose of the Study:

  • To investigate the influence of temperature and crosslinking conversion on the diffusion dynamics of epoxy resin components.
  • To elucidate the molecular mechanisms governing diffusion in epoxy resin systems during crosslinking.

Main Methods:

  • Molecular dynamics (MD) simulations were employed to model the diffusion of 3,3'-diamino diphenyl sulfone (3,3'-DDS) and polyethersulfone (PES) in epoxy resin.
  • Simulations were conducted across a temperature range of 393.15 to 473.15 K and crosslinking conversions from 0% to 85%.

Main Results:

  • Increased temperature enhanced the diffusion of PES and 3,3'-DDS due to increased molecular mobility.
  • Diffusion coefficients of triglycidyl p-aminophenol (TGAP) were initially higher than diglycidyl ether of bisphenol F (DGEBF) at low conversions due to lower molecular weight.
  • Diffusion coefficients of TGAP decreased significantly around 60% crosslinking due to its higher functionality, and both resins showed near-zero diffusion at high conversions.

Conclusions:

  • Temperature and crosslinking conversion are critical factors controlling molecular diffusion in epoxy resins.
  • The interplay between molecular weight, functional groups, and network formation dictates the diffusion behavior of different epoxy resin components.
  • MD simulations provide valuable insights into the complex diffusion phenomena during epoxy resin crosslinking.