Effect of Surfactant and Various Salts on Aqueous Solution Properties of Naphthalene‐Labeled Poly(hydrochloride‐quaternized 2‐norbornene‐5‐methylamine) made by Ring‐Opening Metathesis Polymerization (ROMP)

Naphthalene‐labeled cationic poly(hydrochloride‐quaternized 2‐norbornene‐5‐methyleneamine), poly(HCQNBMA)/NA, has been prepared by ring‐opening metathesis polymerization (ROMP), using {RuCl 2 (CHC 6 H 5 )[P(C 6 H 11 ) 3 ] 2 } as a catalyst in methylene chloride, followed by hydrogenation, hydrolysis, and quaternization. The effect of salt addition on the aqueous solution properties of poly(HCQNBMA)/NA was examined in terms of reduced viscosity, surface tension and fluorescence studies. The reduced viscosity for poly(HCQNBMA)/NA is dependent on the type and concentration of salts added. The viscosity behavior of cationic poly(HCQNBMA)/NA is in contrast with polybetaines. An increase in KCl concentration causes the reduced viscosity of poly(HCQNBMA)/NA to decrease at constant poly(HCQNBMA)/NA concentration. The general shape of the surface tension versus logarithm of concentration curve for poly(HCQNBMA)/NA shows only a slow decrease with increasing polymer concentration upon addition of various salts. The surface tension increases in the series KF > KCl > KBr > KI in a given polymer concentration. When the naphthalene label was introduced into the poly(HCQNBMA), the behavior of the solution properties of the poly(HCQNBMA)/NA could be clearly defined in terms of fluorescence analysis. The quenching efficiency of NaI or CH 3 NO 2 was reduced with increasing KCl concentration arising from compacted conformation of polymer chains. A model of the interaction between poly(HCQNBMA)/NA and surfactant or salt in aqueous solution is proposed.