A Critical Assessment of Micellization of Sodium Dodecyl Benzene Sulfonate (SDBS) and Its Interaction with Poly(vinyl pyrrolidone) and Hydrophobically Modified Polymers, JR 400 and LM 200

Abstract

The self-aggregation of sodium dodecyl benzene sulfonate (SDBS) and its solution behaviors have been critically assessed by conductometric, tensiometric, spectrophotometric, flourimetric, and calorimetric methods. The interfacial adsorption behaviors of SDBS have also been assessed critically. Based on the isothermal titration calorimetric (ITC) measurements, the thermodynamics of micellization of SDBS have been examined in the light of both "mass action" and "pseudophase" principles. A method of simulation has been used to evaluate the aggregation number and the free energy of micellization according to the mass action model. The thermodynamic parameters derived indirectly from the rationale of van't Hoff and directly by microcalorimetry have been compared and discussed. The interaction of SDBS with the water-soluble polymers poly(vinyl pyrrolidone) (PVP), the chloride salt of the N,N-dimethyl-N-methyl derivative of hydroxyethylcellulose (JR 400), and the chloride salt of the N,N-dimethyl-N-dodecyl derivative of hydroxyethylcellulose (LM 200) have been also investigated by the conductometric and microcalorimetric methods. The critical aggregation concentration (cac) and the thermodynamics of binding of the aggregates with the polymer segments, as well as the thermodynamics of formation of free micelles in solution, in the presence of PVP, JR 400, and LM 200 have been quantitatively assessed.

Effect of Head Groups, Temperature, and Polymer Concentration on Surfactant—Polymer Interactions

“…S1, and these values agree well with those reported in literature [34][35][36] (Table 3). For surfactants in the presence of aqueous solutions of high molecular weight polymers, c decreases as a function of log [surfactant] and the first plateau in the slope (supplementary material Fig.…”

On mixed binary surfactant systems comprising MEGA 10 and alkyltrimethylammonium bromides: A detailed physicochemical study with a critical analysis

“…Each run was duplicated to check reproducibility. Further details of the experimental protocol can be found in our earlier reports [20,22,23].…”

“…The C n TABs showed exothermicity while MEGA 10 showed endothermicity of micellization at 303 K. The enthalpograms showed transition from endothermicity to exothermicity in enthalpy of micellization ( H m ) with increase in the content of C n TAB in the mixture. The Sigmoidal Boltzmann equation (SBE) was used for the evaluation of CMC and enthalpy of micellization ( H m ) following the procedure described earlier [22,23]. In the illustration, the equimolar mixture representation had low H m and the SBE fitting was poor.…”

“…The enthalpy change for the process of micellization was directly determined from isothermal titration calorimetry [22,23], so that, (14) H mic = H 0 mic (Cal). Since the micellization of the C n TABs was exothermic and that of MEGA 10 was endothermic at the studied temperature, 303 K, several binary compositions resulted in much narrow and condensed enthalpograms from which determination of CMC and H 0 mic needed careful analysis and verification by repetitive measurements.…”

Interaction of cationic hydroxyethylcellulose (JR400) and cationic hydrophobically modified hydroxyethylcellulose (LM200) with the amino-acid based anionic amphiphile Sodium N-Dodecanoyl Sarcosinate (SDDS) in aqueous medium

“…Due to unfavorable contact between the hydrophobic groups and water, these polymers have a tendency for self-aggregation and association with surfactants. Water soluble cationic celluloses and other biopolymers have been used in such studies (Burke & Palepu, 2001;Burke, Palepu, Hait, & Moulik, 2003;Dan, Ghosh, & Moulik, 2009a;Guillemet & Piculell, 1995;Hait, Majhi, Blume, & Moulik, 2003;.…”