Research On Solution System Of Sodium Mono-alkyldiphenylether Disulfonate

This dissertation had studied the synthesis, properties of surficial chemistry of adouble-hydrophilic anionic surfactant : MADS.First alkyl was added when a chemical reaction occurred between α-alkene(or 1-Alkylbromide) and Diphenyl-ether. Then chlorosulfonic acid was adopted to prepare MADS. MSindicated that the result had a correct structure. Through HPLC and anionic/cationic titration todetermined the mass percent content and it was more than 99%.Under different NaCl concentration, the surface tension of C16-MADS was determinedthrough drip volumn method. It was found that cmc had dropped from 1.45×10-4mol·L-1 to4.10×10-5mol·L-1 with the increase of NaCl concentration, but γcmc was rarely affected. Through thecaculational of micelle thermodynamic parameters,it was concluded that the forming of micellewas driven by entropy.Nm and [Nm] of C12-MADS and C16-MADS were valued by steady fluorescence prob method.We found that within certain temperature, Nm wasn't sensitivity to it, but at high MADSconcentration , Nm was greatly affected by temperature. At the same time, NaCl concentration hadlittle effect to Nm of C12-MADS and C16-MADS.The mixture of C16-MADS/LAS,C16-MADS/DTAC,C16-MADS/DDAO and C16-MADS/AEO6was studied.The value of β was calculated according to regular solution theory.Morever,we appliedcriterion to decide the condition of if there had synergism between surfactants.The mixture of C16-MADS/PEG had been researched. The result showed that the liminalmolecule mass of PEG was 1500, surper-molecade self-assemblement wasn't easy to form whentemperature increased, but NaCl concentration was benefit to it and promote the forming andadsorption of super-molecule self-assemblement.We had studied the adsorption of C12-MADS on Kaoline.It was found that,additive of NaClwas beneficial to the adsorption of C12-MADS on Kaoline, low NaOH concentration did harm toadsorption, more amunt of NaOH increased adsorption, NaOH perhaps played a part of salts.Mechanism of adsorption was studied meanwhile.