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Abstract
In the present work the thermal behavior of some liquid crystalline quaternaries of the formula (C 12H 25) 2N +CH 3RBr −, where R is -CH 3, -CH 2CH-CH 2, -CH 2COOH, -CH 2CH 2COOH, 1s reported. Their thermal behavior was investigated by DSC studies Immediately after the first heating-cooling run and after various periods of time. From this data the peculiar characteristics of each compound are indicated and also a general conclusion can be obtained: the recrystallization rate of these quaternaries depends crucially on the nature of the R-group. Specifically, quaternaries in which R is -CH 2COOH, -CH 2CH 2COOH, recrystallize very fast, due probably to their ability to form, hydrogen bonds, while , such a behavior cannot be justified for the derivatives where R 1s −CH 3, -CH 2CH=CH 2.
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