Abstract
In the present work the synthesis and thermal behavior of some long - chain quaternary ammonium salts functionalized in the polar head, of the formula C 12H 25 N + (CH 3) 2 RBr −, are reported. It has been found that these salts form, through a solid-solid transition, a peculiar solid phase of liquid-like character and they also exhibit improved thermal stability compared to non-functionalized n-alkyltrimethylammonium bromides. Furthermore the thermodynamic parameters of these compounds are dependent in a complicated way on the nature of the functional group.
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