SOME SOLUTION PROPERTIES OF CERTAIN SURFACE-ACTIVE N-ALKYLPYRIDINIUM HALIDES .I. EFFECT OF TEMPERATURE ON CRITICAL MICELLE CONCENTRATIONS

The synthesis of some new surface-active pyridinium halides containing a nonionic polar group in the 4-position of the pyridinium ring is described. Conductivity measurements have been made to determine the c.m.c. of the amphipathic electrolytes from 5° to 60° C at 5° intervals. Changing the anion from bromide to chloride causes an increase in the temperature at which the minimum c.m.c. occurs. The effect of the nonionic polar group on the c.m.c. is discussed. For each salt a series of polynomials has been fitted to the c.m.c.-temperature data with the use of a Stantec Zebra Computer. These polynomials have been used to give the conventional thermodynamic parameters of micelle formation. © 1969.