Abstract
Photoacoustic Fourier transform infrared spectroscopy was utilized to monitor the effect of basic, acidic and neutral aqueous environments on the stability of Nextel ceramic fibres. Such treatments led to the removal of a residual hydrocarbon phase from the fibre and formation of boric acid. The presence of boric acid upon the treatment does not effect the stability of the fibre at high temperatures. At high temperatures, B(OH) 3 is apparently converted to B 2O 3, this process enhancing the surface stability and improving the adhesive properties of fibres to the polymer matrix.
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