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Phase Equilibrium and Interdiffusion in Blends of Polystyrene with Polyacrylates.

Uliana V Nikulova1, Anatoly E Chalykh1

  • 1Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences (IPCE RAS), 31, bld.4 Leninsky prospect, 119071 Moscow, Russia.

Polymers
|July 24, 2021
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Summary

Polystyrene (PS) solubility and interdiffusion with polyacrylates show upper critical solution temperatures above 450 K. Interdiffusion coefficients depend on concentration, temperature, PS molecular weight, and polyacrylate side chain length.

Keywords:
diffusionphase state diagrampolyacrylatepolybutyl acrylatepolyethyl acrylatepolyethylhexyl acrylatepolymethyl acrylatepolystyrene

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Area of Science:

  • Polymer Science
  • Materials Science
  • Physical Chemistry

Background:

  • Understanding polymer solubility and diffusion is crucial for material design.
  • Polystyrene (PS) and polyacrylates are widely used polymers with potential for blending.

Purpose of the Study:

  • To investigate the solubility and interdiffusion of polystyrene with various polyacrylates.
  • To determine phase behavior, interaction parameters, and diffusion coefficients.

Main Methods:

  • Optical interferometry was used to study solubility and interdiffusion.
  • Flory-Huggins theory was applied to analyze phase diagrams and diffusion.
  • Phase state diagrams, binodal, and spinodal curves were constructed.

Main Results:

  • Systems exhibit upper critical solution temperatures (UCST) above 450 K.
  • Pair interaction parameters and their temperature dependencies were analyzed.
  • Interdiffusion coefficients were calculated and analyzed concerning concentration, temperature, PS molecular weight, and polyacrylate structure.

Conclusions:

  • The study provides insights into PS-polyacrylate phase behavior and diffusion dynamics.
  • Interdiffusion coefficients decrease with increasing side chain length in polyacrylates.
  • Friction coefficients were calculated, and matrix structure effects on diffusion were estimated.