Sorption of polymer

Different aspects of polymer adsorption have been discussed by Lyklema [738], Adsorption of polymers on oxides was recently reviewed by Esumi [739], Sorption of polymers on bentonite was recently reviewed by Luckham and Rossi [740], A few recent studies of polymer adsorption on inorganic materials are compiled in Table 4.6. 

Figure II. Liquid sorption of polymer A in methanol-water solutions at 60° C as a function of mole fraction of methanol.

Three different types of nucleation products have been proposed formation or sorption of polymers (dimers, trimers, etc.) on the surface (polynuclear surface complexes) a solid solution or coprecipitate that involves co-ions dissolved from the adsorbent and a precipitate formed on the surface composed of ions from the bulk solution, or their hydrolysis products (5,15,33,62,69). The two latter products are examples of surface precipitates. 

EFFECT OF SODIUM LAURYL SULFATE ON SORPTION OF POLYMER JR-125... 

Figure 7 Effect of added salt on the sorption of Polymer JR 125 by bleached hair 0.1% polymer solutions. (From Ref. 7.)... 

Experiments with bleached hair (7), in which the effect of ionic surfactants on deposition of the polycation was studied in more detail, yielded results that, in general, paralleled those obtained for virgin hair. One finding of obvious potential importance was that the sorption of polymer decreased approximately in proportion to the amount of anionic surfactant (SDS) present, presumably owing to progressive tie-up of the polycation in negatively charged complexes. 

Figures 1 and 2 present the adsorption data for brown hair, for a constant polymer concentration of 0.1%. Two features of Polymer JR adsorption are noteworthy. First, equilibrium sorption is not attained even after 2 days, whereas sorption of the uncharged HEC achieves a constant value in 5 min. Second, sorption of Polymer JR decreases markedly with increasing MW. If one converts the adsorption value of HEC (ca. 0.05 mg/g hair) to an area value per anhydioglucose residue (MW 250), one finds it corresponds to the value expected for a close-packed monolayer of the cellulose in flat orientation, viz., 85 A ...

Figure 1 Sorption of polymers by hair 0.1% polymer solution. 

CTAB sharply reduces sorption of Polymer JR-125. This is shown in Figure 5, which includes results for other surfactants. The nonionic surfactant Tergitol 15-S-9 has a comparatively minor influence on the sorption, as a result, presumably, of little interaction tendency of this surfactant (12) with either the polymer or the keratin. The reduction in sorption observed in the presence of the amine oxide Barlox 12 is ascribed to sorption of this material by the hair in view of the appreciable sorptive tendency of the related material... 

Figure 6 Sorption of Polymer IR-400 by hair, rayon, and nylon versus residual eoneentration. 

Figure 7 Effeet of salts and surfaetants on the sorption of Polymer IR-125 by eotton 0.1% polymer solution.

---