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Meier, Gerhard
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article
Dynamics of supercooled van der Waals liquid under pressure. A dynamic light scattering study
Abstract
<p>Dynamics of 1,1′-di(p-methoxyphenyl)cyclohexane (BMPC) was studied in a temperature range of 253-313 K and a pressure range of 0.1-180 MPa by means of depolarized dynamic light scattering-photon correlation spectroscopy. The temperature dependence of the mean structural relaxation times measured at constant pressures was analyzed using the Vogel-Fulcher-Tamman (FVT) equation. From the FVT analysis the values of the fragility and the glass transition temperature T<sub>g</sub> and T<sub>0</sub> as well as their pressure dependence dT<sub>g</sub>/dP and dT<sub>0</sub>/dP were obtained and compared with the corresponding quantities obtained for a chemically similar but dynamically different liquid 1,1′-di(4-methoxy-5-methylphenyl cyclohexane (BMMPC), in which two additional intramolecular relaxations were previously reported. The temperature and pressure dependence of the mean structural relaxation times was also analyzed using the Avramov model. © Springer-Verlag 2004.</p>