The interaction between polymer and surfactant as revealed by interfacial tension

Dynamic Surface Tension of Aqueous Polymer Solutions, I: Ethyl(hydroxyethyl)cellulose (BERMOCOLL cst-103)

“…Boundary conditions for the derivation of Eq. and sodium dodecylsulfate (SDS)/EHEC/water/cyclohex- [1] are c s Å 0 at t Å 0 and c o Å constant at t § 0. ane (14). In the latter system the effect was less and varied At the very beginning of the diffusion process, the very with the age of the solution and the concentration of SDS.…”

“…Subse-Å {K*c o £)} 2 n . [14] quently this was carefully dialyzed and filtered to get a saltfree, homogeneous solution. All the water used was deionized and double-distilled.…”

“…Eq. [14]), the induction log(t cr1 ) Å log(t*) 0 1/n and time of adsorption might be significant. This is in agreement with the lag-time periods observed for the solutions conlog(t cr2 ) Å log(t*) / 1/n.…”

“…The dynamic of trains, loops, and tails. A change in the conformation of surface tension of aqueous solutions of low-molecular-the adsorbed macromolecules can cause a drastic effect both weight surfactants has been thoroughly studied by different on the fraction of the segments directly in contact with the experimental techniques (2-10), whereas similar analyses surface, i.e., on the surface tension, and on the thickness of concerning nonionic polymers are few (11)(12)(13)(14). In order to the adsorbed polymer layer (cf.…”

Aqueous Solutions of Sodium Deoxycholate and Hydroxypropylmethylcellulose: Dynamic Surface Tension Measurements

“…They also give information on the intermolecular interaction of the adsorbed surfactant molecules. The dynamic interfacial characteristics of the polymers have been studied on a time scale from 30 s to some hours using the pendant drop technique (5,6). It has been reported that the polymer molecules diffuse from the bulk to the interface; they are then adsorbed there and the procedure is followed by conformation changes.…”