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Case II diffusion in the PVC and acetone system

K L Perry1, P J McDonald, A S Clough

  • 1Department of Physics, University of Surrey, Guildford, UK.

Magnetic Resonance Imaging
|January 1, 1994
PubMed
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Nuclear magnetic resonance (NMR) studied acetone diffusion into PVC, revealing case II diffusion characteristics. Temperature dependence of front velocity and component relaxation times were determined.

Area of Science:

  • Polymer science
  • Materials science
  • Physical chemistry

Background:

  • Case II diffusion is a complex transport phenomenon observed in polymers.
  • Understanding diffusion mechanisms is crucial for polymer processing and material design.
  • Nuclear Magnetic Resonance (NMR) spectroscopy is a powerful tool for probing molecular dynamics.

Purpose of the Study:

  • To investigate the case II diffusion of acetone into polyvinyl chloride (PVC) using NMR.
  • To characterize the physical manifestations of case II diffusion under varying exposure times.
  • To determine the temperature dependence of diffusion parameters and molecular relaxation.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy was the primary technique.
  • Ion Beam Nuclear Reaction Analysis (IBS-3) and Gravimetric Analysis were used for support.

Related Experiment Videos

  • Experiments were conducted at temperatures ranging from 20 to 50 degrees C.

    • Main Results:

    • Observable physical characteristics of case II diffusion were identified.
    • The temperature dependence of the diffusion front velocity was quantified.
    • Transverse relaxation times (T2) for both acetone and PVC components were measured.

    Conclusions:

    • NMR effectively elucidates case II diffusion mechanisms in polymer-solvent systems.
    • Diffusion front velocity and molecular dynamics are temperature-dependent.
    • This study provides insights into acetone-PVC interactions and diffusion kinetics.