Internal friction (IF) was measured for two polymer liquid crystal (PLC) esters, PET/xPHB, where PET is poly(ethylene terephthalate), PHB is p‐hydroxybenzoic acid, with the mole fractions x of the PHB in the copolymers 0.5 and 0.6. Pure PET was also studied for comparison. The internal friction parameter Q−1 and the square of the output vibration frequency ƒ2 were determined as a function of temperature between −150°C and +400°C for a fixed input frequency. Values of the latter were varied between 0.…
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