Aqueous Polymer — Cosolute Systems: Special Issue in Honor by Chaoyang Wang, Zhen Tong, Fang Zeng, Biye Ren (auth.), Dan

By Chaoyang Wang, Zhen Tong, Fang Zeng, Biye Ren (auth.), Dan F. Anghel (eds.)

Praise to D.F. Anghel's Aqueous Polymer


"The quantity could be a precious source for these attracted to complexation among water-soluble polymers and surfactants and alertness scientists operating during this area."

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1b. In all cases, the cac values over the whole mole fraction range show a nonlinear variation. The Clint equation in the following form can be used to identify the ideality in the mixed-micelle formation [26]: 1 a1 ð1 À a 1 Þ ¼ þ ; cacà cac1 cac2 Fig. 1 Conductivity, j, versus total concentration of benzyldimethylhexadecylammonium chloride (BHDACl) and hexadecyltrimethylammonium bromide (HTAB) mixtures at some selected mole fractions in the presence of dextran sulfate sodium salt (DX). b Critical aggregation concentration (cac) versus mole fraction of BHDACl for BHDACl+HTAB mixtures in the presence of various polyelectrolytes: carboxymethylcellulose sodium salt (CMC), polystyrene sulfonate sodium salt (PSS), polyacrylic acid sodium salt (PAA) Experimental cac (symbols); predicted cac* (lines) ð1Þ where a1 is the mole fraction of surfactant 1 (BHDACl) in total mixed solute; cac1 and cac2 are the cacs of components 1 and 2, respectively.

02 · 10)2 M PAA, and of DeA-Ac at pH 4 Fig. 02 · 10)2 M PAA Fig. 02 · 10)2 M PAA, and of DeA-Pr at pH 4 Fig. 02 · 10)2 M PAA against surfactant concentration The pH of DeA-R solutions (Fig. 10) showed a peak at the concentration corresponding to the minimum in the respective surface tension isotherm (Figs. 7, 8), though DeA-Bu had no minimum (Fig. 9). Finch and Smith [39] found an optimum pH at which the surface tension of DoA-Ac solutions reaches a minimum, and attributed it to surfactant hydrolysis.

The rather abrupt changes can be explained by the formation of a disordered lamellar associate structure. Under shear stress, a transition to an anisotropic phase, characterized by the typical optical pattern of a lamellar liquid-crystalline phase, is observed. Generally speaking, PDADMAC tends to favor the formation of a lamellar liquid-crystalline phase (La phase). This means that interactions between the sulfobetaine head groups and the functional groups of PDADMAC are of importance not only with regard to the extension of the phase range, but also with regard to the phase transition to an anisotropic phase.

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