Hydrogen bonding and the liquid‐to‐glass transition in propan‐1‐ and ‐2‐ol at high pressures

Abstract

The pressure dependence of the vibrational modes of propan-1-and 2-01 was measured by Raman spectrwopy up to 8 GPa at 300 K. Changes in the observed vibrational spectra indicate that the samples undergo a liquid-teglass transition at about 4.5 GPa for propan-%ol and about 5.5 GPa for propan-1-01. The frequency of the 0-H stretching mode (a probe of the degree of hydrogen bonding) was found to decrease at a rate of cu -28 cm-' GPa-' for both propan-1-and -2-01.

High-pressure viscosity of glass-forming liquids measured by the centrifugal force diamond anvil cell viscometer

“…The value of P* -4.7 ± 0.3 GPa for 1,2-propanediol can be compared to the ruby fluorescence determinations of Pg = 4.4 GPa for glycerol and Pg * 4.3 GPa for 2-propanol.36 Yenice et al also reported glass transition pressures determined from Raman scattering measurements of 4.5 GPa for 1-propanol and 5.5 GPa for 2-propanol. 37 In decompression experiments, we observed the loss of pressure gradients at 2.2 GPa for dibutyl phthalate which compares with P* of 1.8 ± 0.1 GPa.…”