Abstract

Abstract : Silica xerogels have been prepared from tetraethylorthosilicate with 50 volume percent open porosity. Methyl methacrylate monomer has been introduced into xerogel monoliths and polymerized with ultraviolet radiation. The fully infiltrated silica gel - PMMA composite has a bulk density of about 1.6 g/cm cubed. The resulting composite is light-weight and optically transparent. Elastic constants have been determined with ultrasonics. Flexure strengths have been measured in 4-point bending. The flexure strength of the composite is over 100 MPa in comparison to 20 MPa for the silica xerogel. The composite is designed for use at or below room temperature.

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