We investigated the validity of the fluctuation dissipation theorem in the structural glass former triphenylolmethane triglycidyl ether. Polarization relaxation measurements were compared to the thermal fluctuation of the polarization. We observed that above the glass transition temperature, the fluctuation dissipation theorem is fully verified, whereas below the glass transition temperature the power noise spectrum measured subsequently to a temperature quench is more intense than that expected from response measurements. The amplitude of the fluctuation is distributed according to a non Gaussian distribution, whose origin is not strictly related to the presence of intense noise pulses.
Polarization fluctuations in an epoxy system above and below the glass transition
CAPACCIOLI, SIMONE;
2007-01-01
Abstract
We investigated the validity of the fluctuation dissipation theorem in the structural glass former triphenylolmethane triglycidyl ether. Polarization relaxation measurements were compared to the thermal fluctuation of the polarization. We observed that above the glass transition temperature, the fluctuation dissipation theorem is fully verified, whereas below the glass transition temperature the power noise spectrum measured subsequently to a temperature quench is more intense than that expected from response measurements. The amplitude of the fluctuation is distributed according to a non Gaussian distribution, whose origin is not strictly related to the presence of intense noise pulses.| File | Dimensione | Formato | |
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Polarization fluctuations
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