CATIONIC POLYMER ADSORPTION 95 E 12 v ß 1- 10 z 0 I- 8 0 c• 6 • 4 z n- 2 o 9.1 + 0.3 8.6 + 0.2 - -- -- 3O MINS/32øC 4 HRS/40 ø c BLEACHED HAIR TYPE ,•'• 0.05% (w/v) • 0.20% (w/v) POLYQUATERNIUM-10 POLYQUATERNIUM-10 Figure 4. The effect of Polyquaternium-10 solution concentration on cationic uptake by bleached hair. and governed principally by, the severity of bleach treatment. Uptake also varied directly with the concentration of Polyquaternium-10 treatment solutions and the con- tact time between polymer and hair tress. In our work, colloid titration is reproducible within closely defined parameters. The analysis of polymers other than Polyquaternium-10 must be preceded by determinations of stoichiometry for linearity between analyte and titrant. ACKNOWLEDGMENTS The assistance of C. D. Crawley, Ph.D., and Ruby Caro, as well as the support of the University of Cincinnati and the Aqualon Company, are acknowledged and appreciated. REFERENCES (1) A. L. L. Hunting, The function of polymers in shampoos and conditioners, Cosmet. Toilet., 99, 5740 (June, 1984). (2) E. D. Goddard, Substantivity through cationic substitution, Cosmet. Toilet., 102, 71-80 (April, 1987). (3) Y. K. Kamath, C. J. Dansizer, and H.-D. Weigmann, Surface wertability of human hair. I. Effect of deposition of polymers and surfactants, J. Appl. Polym. Sci., 29, I011-1026 (1984). (4) A.M. Schwartz, The zeta potential and its application in cosmetic science, Proc. Soc. Toilet. Goods Assoc., 39, 16-19 (1963). (5) J. Jachowicz, M. Berthiaume, and M. Garcia, The effect of the amphiprotic nature of human hair keratin on the adsorption of high charge density cationic electrolytes, Coll. Polym. Sci., 263, 847-858 (1985). (6) R. J. Crawford and C. R. Robbins, A replacement for Rubine dye for detecting cationics on keratin, J. Soc. Cosmet. Chem., 31, 273-278 (1980). (7) E. D. Goddard, J. A. Faucher, R.J. Scott, and M. E. Turney, Adsorption of Polymer JR on keratinous surfaces--Part II, J. Soc. Cosmet. Chem., 26, 539-550 (1975).

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