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Encapsulation methods for photo-polymerisable self-healing formulations.

Wael Ballout1,2, Alain Périchaud1,2, Laura Caserta1,2

  • 1a Macromolecular Chemistry Laboratory , Paul Cezanne University (Aix-Marseille III) , Marseille , France ;

Journal of Microencapsulation
|June 11, 2016
PubMed
Summary

This study developed self-healing photo-polymerisable materials encapsulated in silica microcapsules for demanding aerospace conditions. The encapsulated material demonstrates excellent thermal stability and photo-polymerisation capabilities for space applications.

Keywords:
microencapsulationphotopolymerisationself-healingsol–gel

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Aerospace Engineering

Background:

  • Aerospace applications require materials with high thermal stability and resistance to harsh conditions like extreme temperatures and UV radiation.
  • Self-healing materials offer enhanced durability and longevity, crucial for components in space environments.
  • Existing materials may not meet the stringent requirements for prolonged space missions.

Purpose of the Study:

  • To develop and encapsulate a self-healing photo-polymerisable material suitable for aerospace applications.
  • To ensure the material meets extreme temperature (-120°C to +250°C), UV radiation, and low-pressure requirements of space.
  • To validate the self-healing capability and thermal stability of the encapsulated formulation.

Main Methods:

  • Selection of trimethylolpropane triacrylate (TMPTA) as the healing agent, with an inhibitor to prevent premature polymerization.
  • Utilisation of the sol-gel process for the microencapsulation of the TMPTA formulation within silica microcapsules.
  • Characterisation of microcapsules using scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and Fourier transform infrared spectroscopy (FTIR).

Main Results:

  • Silica microcapsules with sizes ranging from 1-30 μm were successfully fabricated and exhibited thermal stability exceeding 250°C.
  • The encapsulated formulation demonstrated effective self-healing through radical photopolymerisation of released TMPTA upon microcapsule breakage.
  • The regenerated poly(TMPTA) film showed excellent thermal stability, surpassing 300°C, confirmed by FTIR analysis.

Conclusions:

  • The sol-gel encapsulated self-healing photo-polymerisable material meets the rigorous environmental demands of aerospace applications.
  • The developed microcapsules provide a robust system for delivering self-healing capabilities in extreme conditions.
  • This technology holds significant promise for enhancing the reliability and lifespan of aerospace structures and components.