TY - JOUR
AU - Mirchandani, V
AB - A method and a convenient inexpensive apparatus are described for carrying out thermoacoustic analysis (TAA) of materials from room temperature to about 350 degrees C by monitoring the changes in the ultrasonic velocity in the sample as a function of temperature with the heating rate as a user-defined variable parameter up to 10 degrees C min-1. The thermoacoustimetric apparatus described is readily constructed from commercially available components with minimum workshop machining. The sample is loaded by sandwiching it between two identical glass buffer rods, one of which is stationary and the other vertically movable, without the need to attach transducers and thermocouples directly to the sample. The ultrasonic velocity is obtained from the time difference between the through signal at the receiving end and the echo at the transmitter end. The apparatus was used to measure the glass transition temperatures of polycarbonate, polyphenylenesulphide in matrix form as part of an aramid fibre-PPS matrix composite, poly(methyl methacrylate) and near stoichiometric As2Se3 glass from the break point of the semilogarithmic plot of the ultrasonic velocity against the temperature as in the case of thermomicrohardness measurements. The measurements, where possible, have been compared with those obtained from conventional differential scanning calorimetry and thermomicrohardness analysis.
TI - Method and apparatus for thermoacoustimetry: applications to polymers and glasses
JF - Measurement Science and Technology
DO - 10.1088/0957-0233/4/11/005
DA - 1993-11-01
UR - https://www.deepdyve.com/lp/iop-publishing/method-and-apparatus-for-thermoacoustimetry-applications-to-polymers-i2H0S6cRzP
SP - 1213
VL - 4
IS - 11
DP - DeepDyve
ER -