Abstract
Low-density piezoelectric aluminosilicate aerogels were prepared bysol-gel technology. In order to reinforce the fragile aluminosilicate aerogels,the inorganic component was mixed with organic polymers (polyacrylic acid,polyvinyl acetate and polydimethylsiloxane) prior to gelation. The strength ofthe composite gels increases by a factor of two or three. The piezoelectricityof the composite gels changes variously depending on the kind and content ofthe organic polymers. The aerogel containing polyvinyl acetate shows negligiblepiezoelectricity. The use of polydimethylsiloxane decreases the piezoelectricityby 50% and polyacrylic acid increases it by 100%. The chemical structures ofthe composite gels were investigated by means of 27Al and 29Si magicangle spinning nuclear magnetic resonance, infrared spectroscopy and small anglex-ray scattering. The structure and the Al incorporation have strong effects onthe piezoelectricity. The higher the amounts of bonded Al atoms in the silicanetwork the higher the intensity of the piezoelectricity is.
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