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Phase Equilibrium and Interdiffusion in Poly(Vinyl Methyl Ether)-Water System.

Uliana V Nikulova1, Anatoly E Chalykh1

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

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Summary
This summary is machine-generated.

This study reveals a complex phase behavior in poly(vinyl methyl ether)-water solutions, identifying two lower critical solution temperatures and quantifying diffusion coefficients. Unusual phase diagrams are linked to polymer-water complex formation.

Keywords:
interdiffusionphase behaviorphase dissolution kineticpoly(vinyl methyl ether)sorptionwater solution

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Area of Science:

  • Polymer Science
  • Physical Chemistry
  • Solution Thermodynamics

Background:

  • Understanding polymer-water interactions is crucial for various applications.
  • Poly(vinyl methyl ether) (PVME) is a water-soluble polymer with complex solution behavior.

Purpose of the Study:

  • To investigate the phase state diagram of the PVME-water system.
  • To determine diffusion coefficients and analyze water sorption kinetics.
  • To explore the underlying mechanisms of the observed phase behavior.

Main Methods:

  • Optical interferometry for phase diagram determination.
  • Flory-Huggins theory for calculating interaction parameters.
  • Analysis of concentration profiles and diffusion coefficients.

Main Results:

  • The PVME-water system exhibits two lower critical solution temperatures (LCSTs) at 21°C (concentrated) and 31°C (dilute).
  • Novel diffusion coefficients for PVME in water and water in PVME were obtained, with concentration and temperature dependencies analyzed.
  • Water sorption kinetics and clustering behavior were investigated, estimating the size of water clusters.

Conclusions:

  • The complex phase diagram is attributed to the formation of a PVME-water complex.
  • The disappearance of the interphase upon crossing the binodal curve in dilute solutions was observed and its kinetics analyzed.
  • This research provides fundamental insights into the thermodynamics and transport phenomena in PVME-water solutions.