Experimental studies of the liquid-glass transition in trimethylheptane
The molecular glass former trimethylheptane was studied by calorimetric, dielectric, ultrasonic, neutron scattering, Brillouin scattering, and depolarized light-scattering techniques. The molecular structure appears to be nearly spherical optically as indicated by the low depolarization ratio and dielectric susceptibility values. A preliminary mode-coupling theory (MCT) analysis of the light-scattering and neutron-scattering data indicates that T(C) greater, similar150 K, at least 25 K above T(G). The susceptibility minima were analyzed with the MCT interpolation equation, and disagreement between the light and neutron results was observed despite the apparent isotropy of the molecules.
Shen
GQ
Department of Physics, City College of the City University of New York, New York, New York 10031, USA.
Toulouse
J
Beaufils
S
Bonello
B
Hwang
YH
Finkel
P
Hernandez
J
Bertault
M
Maglione
M
Ecolivet
C
Cummins
HZ