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Related Experiment Videos

Diffusion characteristics of alginate membranes.

A G Andreopoulos1

  • 1Laboratory of Special Chemical Technology, N.T.U. Athens, Greece.

Biomaterials
|September 1, 1987
PubMed
Summary

Alginate membranes used in poly(methyl methacrylate) casting exhibit non-Fickian water sorption. Methyl methacrylate treatment reduces swelling, potentially due to surface film formation.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Chemical Engineering

Background:

  • Alginate membranes serve as crucial mould release agents in poly(methyl methacrylate) (PMMA) casting.
  • Understanding membrane diffusion is vital for optimizing PMMA production processes, particularly in water baths.
  • Key penetrants include methyl methacrylate (MMA) and water, influencing membrane performance.

Purpose of the Study:

  • To investigate the diffusive properties of alginate membranes prepared via interfacial reaction.
  • To analyze the sorption behavior of water and methyl methacrylate (MMA) in alginate membranes.
  • To determine the effect of temperature and combined water/MMA exposure on membrane swelling.

Main Methods:

  • Preparation of alginate membranes through interfacial reaction with gypsum substrates.
  • Vapour sorption measurements conducted at various temperatures.
  • Investigation of swelling behavior under different temperature and penetrant conditions.

Main Results:

  • Alginate membrane water sorption demonstrated non-Fickian behavior, despite initial linear plots.
  • Elevated temperatures influenced the swelling characteristics of the membranes.
  • Methyl methacrylate (MMA) treatment resulted in significantly reduced equilibrium sorption.

Conclusions:

  • Alginate membrane diffusion is complex and deviates from simple Fickian models.
  • MMA treatment creates a surface layer, likely poly(methyl methacrylate) (PMMA), inhibiting further sorption.
  • Findings provide insights into alginate membrane behavior for improved mould release applications.

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