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The Aspect Ratio and Gas Permeation in Polymer‐Layered Silicate Nanocomposites
Author(s) -
Osman Maged A.,
Mittal Vikas,
Lusti Hans Rudolf
Publication year - 2004
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200400112
Subject(s) - materials science , montmorillonite , composite material , exfoliation joint , nanocomposite , composite number , permeation , oxygen permeability , silicate , aspect ratio (aeronautics) , epoxy , transmission electron microscopy , polyurethane , permeability (electromagnetism) , chemical engineering , graphene , oxygen , nanotechnology , membrane , chemistry , biochemistry , organic chemistry , engineering
Summary: Organophilized montmorillonite‐epoxy and ‐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 wide‐angle X‐ray diffraction (WAXRD) and transmission electron microscopy (TEM). The gas‐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.‐% loading, periodic boundary conditions applied.