Interaction of polyquaternary ammonium salt and persulfate

An interaction between poly(diallyldimethylammonium chloride) and ammonium persulfate in aqueous solutions has been detected and studied by methods of turbidimetry and viscometry. Investigations were carried out with the cationic polymer of different molecular weight. It was shown that association between low-molecular-weight polyquaternary ammonium salt polycations and persulfate anions was predominant over the chemical (redox) reaction with counterions Cl –. Appreciably stable interaction products (gels, suspensions, solids) were prepared by mixing aqueous solutions of poly(diallyldimethylammonium chloride) and ammonium persulfate. The phenomenon was associated with structural complementarity of both reagents and capacity of the divalent persulfate ions to bind two charged polymer groups by intra- and interchain bridges. Stoichiometry of complexes and their thermal stability in water were examined.