Surfactant-Polymer Interactions:Mixed Micelles of Hexadecylpyridinium Bromide and Trimethyltetradecylammonium Bromide in Aqueous Poly(vinylpyrrolidone) Solution

摘要

The conductance of hexadecylpryridinium bromide(HPYBr) and trimethyltetradecylammounum bromide (TTAB) mixtures over the entire mole fraction range of HPyBr(#alpha#_HPyBr) was measured in aqueous poly(vinylpyrrolidone)(PVP) solution containing 1,5,and 10wt% PVP at 30degC.Each conductivity curve showed tow breaks corresponding to two aggregations throughout the whole mole fraction range of HPyBr and TTAB mixutres except for pure TTAB,for which a single break corresponding to the conventionalcriticalmicelle concentration was observed.The two aggregation processes int he presence of low amounts of PVP were mostly similar to those in pure water,however,10 wt% PVP shifted thebreak,corresonding to the second aggregation,toward the higher value.This was attributed to HPyBr/PVP interactions,which were aso evident from the appearance of a second breakin theconductivity (k) plot of pure HPyBr in aqueous 10 wt% PVP.From conductivity data,varisous micellar parameters in the presence of PVP were determined and discussed from the standpoint of micelle-polymer nteractions.The mixing behavior of HPyBr and TTAB correspoinding to thefirst break int hepresence of PCVP was ideal for th emost part and identical to that in pure water.