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Related Experiment Videos

PVC as a sensor membrane material: influence of solvent casting variables.

S M Reddy1, P M Vadgama

  • 1School of Biological Sciences, University of Surrey, Guildford, Surrey, GU2 5XH, UK. s.reddy@surrey.ac.uk

Journal of Materials Science. Materials in Medicine
|September 7, 2004
PubMed
Summary

Reproducibly fabricating unplasticized polyvinyl chloride (PVC) membranes for sensors is challenging. Casting solution temperature significantly impacts membrane thickness and permeability, affecting sensor performance.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Polymer Chemistry

Background:

  • Unplasticized polyvinyl chloride (PVC) is a challenging material for reproducible membrane fabrication.
  • Accurate fabrication is crucial for sensor applications, particularly for amperometric oxidase electrodes.

Purpose of the Study:

  • To assess the effect of variable temperature solvent casting on unplasticized PVC membrane properties.
  • To relate these properties to the function of external membranes in dual membrane amperometric oxidase electrodes.

Main Methods:

  • Solvent casting of unplasticized PVC membranes at variable temperatures (4-37°C).
  • Analysis of membrane thickness and permeability.
  • Evaluation of amperometric responses to catechol, hydrogen peroxide, and ascorbate.

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  • Scanning electron microscopy (SEM) for microstructure analysis.

    • Main Results:

    • Increasing casting solution temperature (4-37°C) led to increased membrane thickness (5-30 µm).
    • Amperometric responses to catechol and hydrogen peroxide decreased with higher casting temperatures.
    • Responses to ascorbate remained unchanged across tested temperatures.
    • SEM revealed distinct microstructure zones, supporting layered formation due to differential solvent evaporation.

    Conclusions:

    • The thermal history of PVC casting solutions critically affects membrane thickness and permeability.
    • Environmental temperature during casting must be considered for reproducible sensor membrane fabrication.
    • Differential solvent evaporation rates likely contribute to layered membrane structures affecting sensor performance.