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The differential scanning dilatometer and phase transitions in liquid crystals

1978; Wiley; Volume: 63; Issue: 1 Linguagem: Inglês

10.1002/polc.5070630111

1936-0959

David Armitage, Fraser P. Price,

Surfactants and Colloidal Systems

Abstract The performance of a differential scanning dilatometer is described in terms of the volume changes recorded near the isotropic to cholesteric transition for cholesteryl laurate. The instrument is also applied to a study of crystallization kinetics. The isotropic–nematic phase transition in p ‐azoxyanisole was also examined by optical microscopy. An instability in the phase boundary is observed at increasing transformation rates. Size effects on this transition are investigated by absorbing the sample in porous silica. The transition is depressed 0.3°K in a 300 Å diameter pore.