DSC characterisation of various phase transitions in mesomorphic benzylidene anilines

✍ Scribed by V. G. K. M. Pisipati; N. V. S. Rao; P. R. Alapati

• Publisher: John Wiley and Sons
• Year: 1989
• Tongue: English
• Weight: 336 KB
• Volume: 24
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.2170241221

✦ Synopsis

To analyse the order of the phase transitions in a number of mesomorphic benzylidene anilines, the DSC (Differential Scanning Calorimetry) method proposed by NAVARD and HAUDIN is used. This method involves the nieasuremrnt of the ratio ( N ) of the DSC peak heights H2/H1 for a given transition, performed with two different heating rates ( !P2/Tl). N is a function of the ratio r2,/rl(= R ) arid the magnitude of N provides a simple way to characterize the order of a phase transition.

* Transition temperatures from thermal microscopy

• AH values in joules/mole