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The interaction of cetyl trimethylammonium bromide (CTAB)and an anionic copolymer derived from 3|sulfopropylmethacrylate, potassium salt (SPMS) and styrene (St) in aqueous solutions has been studied. It was found that the viscosity of the anionic copolymer|CTAB solution rises suddenly in a specific molar ratio of CTAB/anion. For instance, the viscosity of polymer (No.1) solutions increases to about 20 times at CTAB/|SO-3K=1.0～1 05, and increases to about 100 times at CTAB/|SO 3K=1.4～1 5. In the case of polymer samples No.2 and No.3, the changes of solution viscosity are similar to that of sample No.1, but the gelation takes place at CTAB/|SO-3K=1.4～1 5 region because of the lower negative charge density on No.2 and No.3 polymer chains. It is proposed that the dramatical change of the P(SPMS-co-St)/CTAB aqueous solution is ascribed to the aggregation behavior of CTAB, then the P(SPMS-co-St) aggregates. This consideration was verified by fluorescence determination and laser light scattering experiments. Using DMAF as fluoresscent probe, the hydrophobic microdomain existed in P(SPMS-co-St)/CTAB aqueous solutions in the viscosity rising region has been confirmed and it is in agreement well with the results obtained by laser light scattering determination.
The interaction of cetyl trimethylammonium bromide (CTAB) and an anionic copolymer derived from 3 | sulfopropylmethacrylate, potassium salt (SPMS) and styrene (St) in aqueous solutions has been studied. It was found that the viscosity of the anionic copolymer | CTAB solution rises suddenly in a specific molar ratio of CTAB / anion. For instance, the viscosity of polymer (No.1) solutions increases to about 20 times at CTAB / | | SO - 3K = 1.0 to 105, and increases to about 100 times at CTAB / | | SO 3K = 1.4 to 1 5. In the case of polymer samples No. 2 and No. 3, the changes of solution viscosity are similar to that of sample No. 1, but the gelation takes place at CTAB / | SO - 3K = 1.4 ~ 1 5 region because of the lower negative charge density on No.2 and No.3 polymer chains. It is proposed that the dramatical change of the P SPMS-co-St) / CTAB aqueous solution is ascribed to the aggregation behavior of CTAB, then the P (SPMS-co-St) aggregates. This consideration was verified by fluorescence determina tion and laser light scattering experiments. Using DMAF as fluoresscent probe, the hydrophobic microdomain existed in P (SPMS-co-St) / CTAB aqueous solutions in the viscosity rising region has been confirmed and it is in agreement with the results obtained by laser light scattering determination.