Reference

Thermal stability of micellar structures in aqueous surfactant solutions

Thermal stability of micellar structures in aqueous surfactant solutions. Chernikov, O. I. (Inst. Khim. Vysokomol. Soedin., Kiev, USSR). Maslo-Zhir. Prom-st., (2), 24-5 (Russian) 1978. CODEN: MZPYAE. ISSN: 0025-4649. DOCUMENT TYPE: Journal CA Section: 46 (Surface Active Agents and Detergents) The linearity of the log C vs. T functions (C is the crit. concn. of micelle formation, T is the abs. temp.) for Na octanesulfonate [5324-84-5], Na decanesulfonate (I) [13419-61-9], Na dodecanesulfonate [2386-53-0], Na tetradecanesulfonate [27175-91-3], Na hexadecanesulfonate (II) [15015-81-3], and Na octadecanesulfonate [13893-34-0] provided a means for calcg. the micellization enthalpy DH. DH increased with increasing chain length and temp. There was also a decrease of the D log C/D T ratio in the series. DH of I and II at 60° were 1.57 and 4.61 kcal/mol resp. while DH of II increased from 4.61 to 7.74 kcal/mol in the 60° to 160° interval.

Aqueous polymerization of vinyl monomers in the presence of surfactants

Aqueous polymerization of vinyl monomers in the presence of surfactants. IV. Effect of the chain length of the surfactant on the acrylamide polymerization. Vaskova, V.; Juranicova, V.; Barton, J. (Polym. Inst., Slovak Acad. Sci., Bratislava CS-842 36, Czech.). Chem. Pap., 40(4), 435-41 (English) 1986. CODEN: CHPAEG. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) The kinetics of acrylamide [79-06-1] polymn. in water initiated by (NH4)2S2O8 was studied in presence of the surfactants C8H17SO4Na [5324-84-5], C12H25SO4Na [151-21-3], and C16H33SO4Na [1120-01-0]. In the presence of the surfactants, increases in the acrylamide polymn. rate and decreases in the degree of polymn. were obsd. At concns. above crit. micellar concn. the surfactant C12H25SO4Na causes a gentle decrease of the overall activation energy of acrylamide polymn. The length of the n-alkyl chain in the surfactant mol. did not influence the acrylamide polymn. rate.