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The Aspect Ratio and Gas Permeation in Polymer-Layered Silicate Nanocomposites

โœ Scribed by Maged A. Osman; Vikas Mittal; Hans Rudolf Lusti

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
211 KB
Volume
25
Category
Article
ISSN
1022-1336

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โœฆ Synopsis

Abstract

Summary: Organophilized montmorilloniteโ€epoxy and โ€polyurethane nanocomposites, useful for packaging applications, were prepared and their oxygen permeability was measured. The composite morphology was mixed, exfoliated and intercalated, as shown by wideโ€angle Xโ€ray diffraction (WAXRD) and transmission electron microscopy (TEM). The gasโ€barrier performance of the polyurethane composites was better than that of the epoxy composites due to more exfoliation. The average aspect ratio of the montmorillonite platelets in the nanocomposites could be estimated from the reduction in permeability by a numerical finite element approach.

A computer model comprising 50 randomly distributed and oriented round platelets with an aspect ratio of 50 at 3 vol.โ€% loading, periodic boundary conditions applied.

imageA computer model comprising 50 randomly distributed and oriented round platelets with an aspect ratio of 50 at 3 vol.โ€% loading, periodic boundary conditions applied.

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