J. Phys. Colloques
Volume 48, Numéro C8, Décembre 1987Fifth European Conference on Internal Friction and Ultrasonic Attenuation in Solids
|Page(s)||C8-525 - C8-529|
J. Phys. Colloques 48 (1987) C8-525-C8-529
INTERNAL FRICTION OF SOLID SAMPLES COVERED WITH SURFACE LAYER OF LIQUID CRYSTALD. SAMATOWICZ
Gdansk Technical University, Department of Technical Physics and Applied Mathematics , PL-80-952 Gdansk, Poland
Internal friction measurements were made for glass and metal samples covered with thin layer of liquid crystal MBBA, NPOOB and CN. The measurements were performed with the torsion pendulum in the frequency range 1 ÷ 40 Hz and heating rate < 1° C/min. The thin liquid crystal layer on the surface of solid sample causes the appearence of distinct maxima in the internal friction spectrum Q-1(T) and large changes of modulus G. The temperatures of melting and phase transitions for the investigated liquid crystal are close to the temperatures of the maxima in the spectrum Q-1(T).