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Phase Equilibria, Diffusion and Structure in the Epoxypolycaprolactone System.

Irina O Plyusnina1, Nikita Yu Budylin1, Alexey V Shapagin1

  • 1Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky Prospect 31-4, 119071 Moscow, Russia.

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|January 8, 2023
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Summary

This study introduces a quantitative method for predicting thermoplastic system phase structures. Researchers analyzed polycaprolactone-epoxy oligomer mixtures, establishing a phase diagram and calculating key interaction parameters.

Keywords:
DGEBAbiodegradable materialinterdiffusionphase state diagramphase structurepolycaprolactone (PCL)

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Area of Science:

  • Polymer Science
  • Materials Science
  • Physical Chemistry

Background:

  • Predicting the phase structure of cured thermoplastic systems is challenging due to the lack of quantitative approaches.
  • Thermoplastic modification of thermosetting systems requires understanding phase behavior for material property control.

Purpose of the Study:

  • To develop a quantitative method for predicting the phase structure of cured thermoplastic-modified systems.
  • To investigate the phase behavior and structure formation in polycaprolactone-epoxy oligomer (PCL-DGEBA) mixtures.

Main Methods:

  • Differential scanning calorimetry (DSC) for thermal analysis.
  • Refractometry and optical interferometry for phase diagram construction.
  • Optical microscopy for structural analysis of PCL-DGEBA mixtures.
  • Motano-Boltzmann method for diffusion coefficient calculation.

Main Results:

  • A phase diagram for PCL-DGEBA mixtures was constructed.
  • Flory-Huggins interaction parameters were calculated, revealing changes in structure formation with increasing PCL content.
  • Diffusion coefficients, activation energy of viscous flow for PCL, and self-diffusion of DGEBA were determined.

Conclusions:

  • The study provides foundational data for developing a quantitative prediction method for cured thermoplastic system phase structures.
  • Understanding phase equilibria and diffusion kinetics is crucial for controlling the final properties of modified polymer systems.