期刊
JOURNAL OF CHEMICAL PHYSICS
卷 136, 期 8, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3690083
关键词
liquids; permittivity; polymers; shear modulus; specific heat; thermal expansion; vitrification
资金
- Danish National Research Foundation (DNRF)
The frequency-dependent dielectric constant, shear and adiabatic bulk moduli, longitudinal thermal expansion coefficient, and longitudinal specific heat have been measured for two van der Waals glass-forming liquids, tetramethyl-tetraphenyl-trisiloxane (DC704) and 5-polyphenyl-4-ether. Within the experimental uncertainties the loss-peak frequencies of the measured response functions have identical temperature dependence over a range of temperatures, for which the Maxwell relaxation time varies more than nine orders of magnitude. The time scales are ordered from fastest to slowest as follows: Shear modulus, adiabatic bulk modulus, dielectric constant, longitudinal thermal expansion coefficient, and longitudinal specific heat. The ordering is discussed in light of the recent conjecture that van der Waals liquids are strongly correlating, i.e., approximate single-parameter liquids. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3690083]
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