Abstract
As a first step to prepare flexible amorphous materials, organic-inorganic composite gels in the TEOS-PEG system were synthesized from tetraethyl-orthosilicate (TEOS) and polyethylene glycol (PEG) by the sol-gel method. Gels were obtained in a composition range TEOS=20-100mol% at 50°C with an HCl catalyst. Cracks developed in the TEOS-PEG gels under heat-treatment at 50°-150°C. Density evolution of the gels was measured by the Archimedean method as functions of drying time and PEG concentration. The TEOS-PEG gel showed a maximum density at a composition of 10mol% PEG. DTA and TGA data showed that burn out reactions of the organic materials (alcohols and PEG) in the gels take place in a temperature range of 180°-300°C. The Vickers hardness of the gel showed a decrease with PEG addition. Some of the gels containing a high percentage of PEG exhibited an indent recovery which indicates a flexibility in the gel.
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