Evaluation of Surface Active Properties and Voltammetric Characterizations of Some New Anionic Copolymer Surfactants

Abstract

The onset of micelles formations critical micelle concentration, diffusion coefficients as well as particle sizes for some new synthesized anionic copolymer surfactants PSA 4a , PSA 4b , and PSA 4c , were determined and discussed. Three different electrochemical techniques such as cyclic voltammetry (CV), rotating disk voltammetry (RDV), and chronocoulometry (CC) were used in this investigation. The voltammetry of electroactive hydrophobic probe ferrocene solubilized surfactants was investigated in aqueous buffer carbonate solutions of pH 10. The CMC for each PSA 4a , PSA 4b , and PSA 4c , was found to be 3.20 Â 10 À4 , 4.60 Â 10 À4 and 6.30 Â 10 À4 M, respectively, using both CV and RDV techniques. The amount of adsorption contribution of ferrocene solubilized surfactants at the glassy carbon electrode was determined from chronocoulometric measurements and it was found in the range from (1.4 to 2.7) Â 10 À15 M. The apparent diffusion coefficients were estimated from RDV measurements and the real micelles diffusion coefficients were obtained. Re-quilibrium considerations of ferrocene probe kinetics at the electrode surface were treated according to two different modes of slow-and fast-kinetics. The corrected diffusion coefficient values showed constancy at (5.3 AE 0.1) Â 10 À7 , (4.8 AE 0.1) Â 10 À7 , and (3.6 AE 0.4) Â 10 À7 cm 2 /sec for PSA 4a , PSA 4b , and PSA 4c , respectively in the concentration range from 20 to 200 mM. The morphological features of anionic copolymeric surfactants PSA 4a , PSA 4b , and PSA 4c , micelles showed globular self-assembled structure.

Synthesis and Evaluation of Anionic Copolymeric Surfactant as Dispersing Agent for Some Heterocyclic Azo-Dyes

“…Biodegradability is deterred and degradation is slowed as steric hindrance increases. [39,40] The results of biodegradability of [PMmS 2 , PMmS 4 , PMmS 6 , and=or PMmS 8 ] a-i (Figure 2), reflect the fact that: it decreases with increasing the number of repeating units of propenoxy groups as well as, the repeating alkyl groups in hydrophobic unit. [30] Moreover, PMmS 2a-i recorded higher degree of degradation than other prepared copolymeric surfactants.…”

Amphoteric Surface Active Agents with Heterocyclic Ring Based on Industrial Wastes

“…An excellent review of surfactant biodegradability points out that biodegradability increases with increasing linearity of the hydrophobic group and is reduced, for isomeric materials, by branching in that group and in the presence of aromatic ring (27,28) . Biodegradability is deterred and degradation is slowed as steric hindrance increases (29)(30) . Figures 1 and 2 revealed the degradation of the amphoteric surfactants containing the pyridinium moiety(VI a and VII a ) more than the surfactant containing thiazolium moiety ( IV b and IV e ).…”