Structural relaxations of glassy polystyrene and o-terphenyl studied by simultaneous measurement of enthalpy and volume under high pressure
Article Abstract:
Research was conducted to examine the relaxation path in the enthalpy vs volume plane. A further objective was to accurately determine the heat capacity gap, pressure dependence of the glass transition temperature, thermal expansivity gap and isothermal compressibility gap. Calculations were carried out simultaneously using a novel calorimeter. Results indicate that the relaxation paths were inconsistent with the fictive temperature concept in the structural relaxation.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1999
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Calorimetric study of glassy and liquid toluene and ethylbenzene: thermodynamic approach to spatial heterogeneity in glass-forming molecular liquids
Article Abstract:
The heat capacities of glassy and liquid toluene and ethylbenzene were investigated using an adiabatic calorimeter. Both samples were doped with about 10% of benzene to control crystallization. The effects of doping were suppressed by assuming the additivity of the heat capacities of toluene or ethylbenzene and benzene. In addition, the configurational entropies of several glass-forming liquids were determined as functions of temperature from their heat-capacity data.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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