DIFFERENTIAL THERMAL-ANALYSIS UNDER PRESSURE ON CYANOCYCLOHEXANE, ,4-TETRAHYDRO-5,6-DIMETHYL-1,4-METHANONAPHTHALENE, AND 2-METHYL-2-PROPANOL

Differential thermal analysis has been performed on cyanocyclohexane ( CCH), 3,4-tetrahydro-5,6-dimethyl-1,4-methanonaphthalene (TDMN), and 2 -methyl-2-propanol (t-butanol) up to 300 MPa. The latter compound was also investigated dielectrically. CCH displays an ODIC phase that tran sforms only reluctantly to the low-temperature stable phase II. Anneal ing under pressure can appreciably accelerate this transformation. For all three compounds the phase diagrams were established. For CCH and TDMN also the pressure dependence of the glass transition has been det ermined.