Polyimide/silica hybrid-clay nanocomposites

A hybrid-clay nanocomposite was prepared by dispersing organically modified layered silicates (organoclay) into an organic–inorganic hybrid matrix. Layered silicates were dispersed in a hybrid matrix consisting of an alkoxysilane terminated amide acid oligomer and tetraethoxysilane. Transmission ele...

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Bibliographic Details
Published in:Polymer (Guilford) 2005-11, Vol.46 (23), p.9694-9701
Main Authors: Park, Cheol, Smith, Joseph G., Connell, John W., Lowther, Sharon E., Working, Dennis C., Siochi, Emilie J.
Format: Article
Language:English
Subjects:
Applied sciences
Clay
Composites
Exact sciences and technology
Forms of application and semi-finished materials
Nanocomposite
Organic–inorganic hybrid
Polymer industry, paints, wood
Technology of polymers
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Summary:A hybrid-clay nanocomposite was prepared by dispersing organically modified layered silicates (organoclay) into an organic–inorganic hybrid matrix. Layered silicates were dispersed in a hybrid matrix consisting of an alkoxysilane terminated amide acid oligomer and tetraethoxysilane. Transmission electron microscopy (TEM) and wide angle X-ray diffraction (WXRD) confirmed uniform dispersion and a high degree of predominantly exfoliated layered silicates. Storage modulus of the hybrid film containing 5 wt% exfoliated clay was 300% higher above the glass transition temperature and 30% higher at room temperature. The room temperature tensile strength and elongation to break decreased moderately with increasing clay loading. This approach provided a means of achieving excellent dispersion of predominantly exfoliated clay by reacting hydroxyl groups in the inorganic and organic precursors with hydroxyl groups at the edges of the clay layers.
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2005.08.017