Abstract
Abstract Dynamic thermoacoustical analysis has been described for the characterization of certain physicochemical properties of fibers. The method consists of a continuous measurement of the propagation time of constant frequency sonic pulses transmitted through the sample which is being held under light tension and heated under programmed temperature. The sonic pulses are generated by subjecting a piezoelectric crystal with electrical pulses of 7 kHz frequency. Dynamic thermoacoustical curves were obtained with a variety of synthetic fibers and cellulose fiber. The fibers were heated from room temperature to their respective melting points or decomposition temperature. Theoretical principles are discussed with respect to the relationship between sonic responses and the fundamental properties of polymers. The dynamic viscoelastic equation, based on Maxwell-Wiechart model for polymers, has been combined with sonic pulse propagation equation in order to relate the sonic response with the viscoelastic parame...
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