The Cu 0 -mediated single electron transfer-living radical polymerization of acrylamide and N,N-dimethyl-N-methacryloyloxyethyl-N-sulfobutyl ammonium in aqueous at 25 C using 2-chloropropionamide as initiator with Cu 0 powder/tris-(2-dimethylamino ethyl)amine (Me 6 -TREN) as catalyst system is studied. The results showed the characteristic of the ''living'' polymerization that were the M n of polymers increased linearly with monomer conversion and the ln([M] 0 /[M]) increased linearly with time too, meanwhile the narrow molecular of weight distributions were found at most cases. Because of the high rate constant of propagation and bimolecular termination of the acrylamide, the external addition of CuCl 2 is required to mediate deactivation the early stage of polymerization. In addition, the disproportionation constant of Cu I X/L in H 2 O is higher than in other solvents and the coordination of amino group and Cu II takes place easily, so the isopropanol or N,N-dimethylformamide is added to control the polymerization. High conversions were achieved within short time and the polymers prepared showed good antipolyelectrolyte properties in inorganic salts solutions. V C 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 49: [432][433][434][435][436][437][438][439][440] 2011

A series of surface active sulfo-propane betaines and sulfo-butane betaines were synthesized with high yields by the reaction of an appropriate N,N-dimethyl alkylamine with an excess of 1,3-propane sultone and 1,4-butane sultone. The structures were characterized by 1 H-NMR spectroscopy and elemental analysis. The micellar properties of these compounds were determined by surface tension methods. Surface tension measurements also provide information about the dependence of the surface tension at the CMC (c cmc ), pC 20 (negative logarithm of the surfactant molar concentration C 20 required to reduce the surface tension by 20 mN/m), the surface excess (C max ) at air/solution interface, the minimum area per surfactant molecule at the air solution interface (A).

The thermodynamics of micellization of the sulfobetaine (SB) amphoteric surfactants, that is N‐alkyl‐N,N‐dimethyl‐3‐ammonio‐1‐propanesulfonate and N‐alkyl‐N,Nd‐imethyl‐3‐ammonio‐1‐butanesulfonate (the carbon atom number of the alkyl chain is 12, 14 and 16 respectively) in aqueous solution, have been studied by surface tension measurements with the temperature range from 298.15 to 318.15 K. The critical micelle concentrations (CMC) of SB n‐3 and SB n‐4 surfactants were determined from the drop‐volume methods at different temperatures. The obtained results indicated that the values of critical micelle concentration strongly depended on the surfactants species and temperatures. Thermodynamic parameters (Gmic∘, Hmic∘ and Smic∘) of the micelle formation were determined. The micellization was found to be enthalpy‐driven at lower temperatures, while this process was entropy‐driven at higher temperatures. The enthalpy–entropy compensation were also investigated. The compensation temperature Tc and Hmic⃰ decreased, while Smic⃰ increased with the increase in the hydrophobic chain length.