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Manipulating Frontal Polymerization and Instabilities with Phase-Changing Microparticles.

Yuan Gao^1,2, Mason A Dearborn³, Sagar Vyas^1,2

¹Beckman Institute of Advanced Science and Technology, University of Illinois, Urbana, Illinois 61801, United States.

The Journal of Physical Chemistry. B

|July 6, 2021

Summary

This summary is machine-generated.

Adding poly(caprolactone) microparticles to frontal polymerization (FP) stabilizes the process by absorbing heat, reducing instabilities, and controlling front velocity and temperature in thermoset manufacturing.

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Area of Science:

Polymer Science
Materials Science
Chemical Engineering

Background:

Frontal polymerization (FP) is a rapid, eco-friendly method for thermoset polymers and composites.
FP can exhibit thermo-chemical instabilities, leading to material property variations.
Controlling these instabilities is crucial for predictable material outcomes.

Purpose of the Study:

To investigate the effect of poly(caprolactone) microparticles on frontal polymerization instabilities.
To analyze the influence of microparticles on front velocity, temperature, and pattern formation.
To validate a reaction-diffusion model predicting these effects.

Main Methods:

Numerical analyses of reaction-diffusion models.
Experimental frontal polymerization of cyclooctadiene with poly(caprolactone) microparticles.
Measurement of front velocity, temperature, and instability characteristics.

Main Results:

Microparticle melting absorbs exothermic energy, reducing thermal instability amplitude and order.
Poly(caprolactone) microparticles suppress front velocity and peak temperatures.
Experimental data validated model predictions for velocity and temperature dependence on microparticle concentration.

Conclusions:

Homogeneously mixed poly(caprolactone) microparticles effectively stabilize frontal polymerization.
Microparticle addition offers a method to control FP dynamics and material properties.
The reaction-diffusion model accurately predicts the stabilizing effects of microparticles.