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Related Experiment Video

Updated: Aug 3, 2025

Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application
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Self-Healing Poly(urea formaldehyde) Microcapsules: Synthesis and Characterization.

Jehan Kothari1, Jude O Iroh1

  • 1Mechanical and Materials Engineering Department, University of Cincinnati, Cincinnati, OH 45221, USA.

Polymers
|April 13, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed high-temperature self-healing microcapsules using poly(urea formaldehyde) and hexamethylene diisocyanate. These microcapsules enhance composite thermal stability and self-healing capabilities, overcoming limitations of conventional low-glass transition temperature materials.

Keywords:
diisocyanatesepoxyglass transition temperaturemicrocapsulespoly(urea formaldehyde)self-healing

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Composite Materials

Background:

  • Smart coatings and polymers offer self-healing properties but often have low glass transition temperatures (Tg).
  • Low Tg self-healing materials can plasticize and weaken advanced composites, limiting their application.
  • There is a need for self-healing materials suitable for advanced composites that can withstand moderate to high temperatures.

Purpose of the Study:

  • To prepare moderate to high temperature self-healing microcapsules for advanced composites.
  • To investigate the self-healing capabilities of microcapsules in stopping crack propagation.
  • To evaluate the thermal and thermomechanical properties of microcapsule-reinforced composites.

Main Methods:

  • Microcapsules synthesized via a two-step process: poly(urea formaldehyde) (PUF) prepolymer synthesis and hexamethylene diisocyanate (HDI) encapsulation.
  • Characterization using Fourier transform infrared spectroscopy (FTIR), optical microscopy, thermogravimetric analysis (TGA), and dynamic mechanical analysis (DMA).
  • Preparation and testing of microcapsule/epoxy composite films.

Main Results:

  • Successful encapsulation of HDI within crosslinked PUF shells verified by FTIR and microscopy.
  • Microcapsule degradation onset temperatures ranged from 155 °C to 195 °C.
  • Epoxy/microcapsule composites exhibited increased glass transition temperatures (34–65 °C) and enhanced thermal stability compared to neat epoxy.

Conclusions:

  • The developed microcapsules effectively enhance the self-healing properties and thermal stability of epoxy composites.
  • The reaction between HDI and epoxy during DMA testing indicates the formation of a crosslinked polyurea network, confirming self-healing.
  • These microcapsules offer a promising solution for repairing advanced composites at moderate to high temperatures.