INFLUENCE OF IONENE POLYELECTROLYTES ON RHEOLOGY AND PHOTORHEOLOGY OFAQUEOUS MICELLAR CETYLTRIMETHYLAMMONIUM BROMIDE CONTAINING 9-ANTHRACENE CARBOXYLIC-ACID

Solubilization of 9-anthracene carboxylic acid (9-AC) in aqueous solut ions of [3,12]-ionene and [3,16]-ionene (with bromide counterions) gen erates hydrobromic acid, as revealed by decreasing pH values. Photodim erization of solubilized 9-AC reverts this effect. Newtonian flow is o bserved in solutions of ionenes and 9-AC throughout. In contrast, aque ous solutions of cetyltrimethylammonium bromide containing 9-AC exhibi t viscoelasticity. The flow behavior of such solutions was studied in the presence of various amounts of [3,16]ionene. The addition of ionen es, as well as the photodimerization of 9-anthracene carboxylic acid, reduced viscoelastic features. A shortening of worm-like micelles is l ikely to be the molecular origin of the observed effect. Rheological a nalysis revealed up to four relaxation processes in sheared viscoelast ic systems. (C) 1998 Academic Press.