Tbe thermodynamic properties of two liquid crystals derived from chole
sterol, namely the phenyl-thiocarbonate of cholesteryl and the 2,4-die
thyl-phenyl-thiocarbonate of cholesteryl, were characterised by the di
fferential scanning calorimetry (DSC) and by the thermomicroscopic met
hod. The thermal parameters and some thermodynamic functions associate
d to polymorphic transitions were determined, in correlation with thei
r molecular bases.