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Epoxy/Ionic Liquid-Modified Mica Nanocomposites: Network Formation-Network Degradation Correlation.

Maryam Jouyandeh1, Vahideh Akbari1, Seyed Mohammad Reza Paran2

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Summary

This study synthesized modified mica nanoparticles to enhance epoxy resin curing and thermal stability. The modified mica (Mica-IM) improved epoxy crosslinking and thermal performance, showing potential for advanced nanocomposite materials.

Keywords:
cure indexcure kineticsdegradation kineticsepoxy nanocompositeionic liquidsmica

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Epoxy resins are versatile thermosetting polymers widely used in various applications.
  • Improving the curing kinetics and thermal stability of epoxy resins is crucial for enhancing their performance.
  • Nanoparticles offer a promising route to modify polymer properties, but their effective dispersion and interaction are key challenges.

Purpose of the Study:

  • To synthesize and characterize pristine mica (Mica) and modified mica (Mica-IM) nanoparticles.
  • To investigate the effect of Mica and Mica-IM on the curing behavior and kinetics of epoxy nanocomposites.
  • To evaluate the thermal stability and degradation kinetics of the prepared epoxy nanocomposites.

Main Methods:

  • Synthesis and characterization of Mica and Mica-IM nanoparticles.
  • Preparation of epoxy nanocomposites with varying loadings of Mica and Mica-IM (0.1-5.0 wt.%).
  • Dynamic Differential Scanning Calorimetry (DSC) for cure analysis.
  • Isoconversional methods for kinetic analysis of curing and thermal decomposition.
  • Cure Index (CI) for qualitative assessment of epoxy crosslinking.

Main Results:

  • Both Mica and Mica-IM significantly improved epoxy curability, transforming it from 'Poor' to 'Good'.
  • Mica and Mica-IM reduced the activation energy for epoxy crosslinking, indicating enhanced network formation.
  • Epoxy/Mica-IM nanocomposites exhibited higher thermal stability, with optimal performance at 2.0 wt.% loading.
  • The glass transition temperature of nanocomposites was lower than neat epoxy, suggesting nanoparticle participation in the reaction.

Conclusions:

  • Mica and Mica-IM act as effective additives for enhancing epoxy resin curing and crosslinking.
  • The modified mica (Mica-IM) demonstrates superior performance in improving thermal stability of epoxy nanocomposites.
  • The study provides insights into the molecular-level transformations governing network formation and degradation in epoxy nanocomposites.