Abstract
Krafft temperature ( K T ) measurements of hexadecyltrimethylammonium bromide (HTAB), hexadecylpyridinium bromide (HPyBr), and hexadecylpyridinium chloride (HPyCl) in pure water as well as in the presence of aliphatic polyester (AL-PE) dendrimer and salt have been carried out with the help of conductivity ( κ) measurements. The K T of all surfactants decreases with the increase in the amount of AL-PE, which is explained on the basis of cationic surfactant–AL-PE favorable electrostatic interactions. The quantification of such interactions has been carried out by determining the degree of micelle ionization ( α) of HTAB and HPyBr by using the pseudophase thermodynamic model [J. Phys. Chem. B 106 (2002) 9033; 107 (2003) 5398]. It has been found that the α value for HTAB and HPyBr is much higher in the presence of AL-PE than that in pure water and effect is much pronounced in the case of second generation (2G) AL-PE and HTAB.
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