A rheometer for the measurement of a high shear modulus covering more than seven decades of frequency below 50 kHz

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Abstract
A new rheometer is described. It consists of a transducer unit supplied with an electric impedance analyzing unit. The transducer unit converts a mechanical impedance into an electrical impedance by the piezoelectric effect. A detailed quantitative analysis of the interaction between the sample and the transducer is given. The real and imaginary parts of the she& modulus of a viscoelastic sample can be found in the frequency range of 1 mHz-50 kHz, modulus range of 0.1 MPa-10 GPa, and the temperature range of 150-300 K. The sample volume is 0.3 cm3 and the strain amplitude is exceedingly small. The small size of the transducer allows for good temperature control and equilibration. It has a simple construction based on inexpensive components. Results on the supercooled liquid 2-metyl-2,4-pentandiol at the glass transition obtained by the method are included. 0 1995 American Institute of Physics.