Phase-Transitions Of Odd Normal-Alkanes Of High-Purity - Pressure-Dependence Of The Transition-Temperatures Determined By High-Pressure Dta

Polymorphic transitions of n -pentacosane, n -heptacosane and n -tritriacontane were examined under high pressure up to 500 MPa by high pressure DTA. The samples used were very pure and showed at atmospheric pressure solid-solid transitions, whose number depends on the carbon number in a molecule, beside the rotator transition. Their phase diagrams are presented. As well as the rotator phase, the other high temperature phases showed the upper pressure limit for their existing regions.