Abstract
Intradiffusion coefficients D ii of three binary fluid systems as function of temperature and pressure have been obtained by the pulsed field gradient spin echo technique. The nonpolar component for all three systems is tetramethylsilane (TMS). To this compound pivalonitrile (PN) was added in order to study the influence of large dipole moments upon translational mobility. The other two mixtures contain pivalic acid (PA) and 2,2-dimethyl-1-propanol (DMP). With these compounds the influence of hydrogen bonding was studied. The D ii of these systems were studied at pressures up to 200 MPa and between the onset of crystallization in the mixtures at the low temperature side and 423 K. For DMP/TMS analysis of the chemical shifts of the hydroxyl protons as function of c,T, and p yields information about the position of the hydrogen bond equilibria.
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