烷基芳基磺酸盐相对分-T质量及其分布与表面性能的关系

测定了自制的9种烷基芳基磺酸盐复配体系在25℃下的临界胶束浓度cmc(1×10<'-5>moL/L)及临界胶束浓度下的表面张力γ<,cmc>(mN/m).研究了烷基芳基磺酸盐相对分子质量及其分布与表面性能的关系.平均相对分子质量432的5种分布cmc和γ<,cmc>值分别为:2.341和28.96(递增型分布);2.4...

Relationship Between Relative Molecular Mass and Distribution of Alkyl Aryl Sulfonate Composite Systems and Surface Properties

The critical micelle concentrations(cmc,1×10-5 mol/L) and the surface tensions(γcmc,mN/m) of nine alkyl aryl sulfonate composite systems were measured at 25 ℃. The relationship between composite system relative molecular mass and its distribution and surface properties was studied. The γcmc and cmc values of five distributions with the average relative molecular mass of 432 were determined as 2.341 and 28.96 for the incremental type molecular mass distribution; 2.458 and 32.56 for the descending type distribution; 3.667 and 36.14 for the normal type distribution; 2.201 and 27.55 reverse normal type distribution; and 2.761 and 33.54 for the uniform type distribution, respectively. Moreover, the γcmc and cmc values for the descending distribution with four average relative molecular masses were determined as 3.786 and 29.54, 3.530 and 29.81, 2.458 and 32.56, 8.337 and 29.54 for average relative molecular mass of 390, 418, 432 and 446, respectively. The adsorption capacity, Γmax, the saturated adsorption area, Am, and the surfactant concentration needed in order to reduce surface tension by 20 mN/m(pC20) were calculated according to Gibbs adsorption equation and a reasonable explanation was also presented.