仲醇聚氧乙烯醚硫酸钠的表面性能研究

Surface Properties of Secondary Alcohol Polyoxyethylene Ether Sodium Sulfate

对仲醇聚氧乙烯醚硫酸钠(SAES)的光学微流变性能、倾点、平衡和动态表面张力、铺展性等物化、表面和应用性能进行了研究,并与伯醇聚氧乙烯醚硫酸钠(AES)的性能进行了对比。物化性能研究结果表明,随着样品老化时间的增加,SAES和AES的黏弹性都有所增加,但SAES的黏弹性增加幅度小于AES;SAES的倾点显著低于AES。表面性能研究结果表明,SAES和AES溶液的临界胶束浓度(cmc)分别为0.42 mmol/L和0.45 mmol/L,临界胶束浓度时的表面张力γ_(cmc)分别为27.71 mN/m和30.77 mN/m。相比AES,SAES在气-液界面的吸附扩散速率较快,且SAES和AES低浓度水溶液的吸附过程都属于混合动力控制吸附。应用性能研究结果表明,与AES相比,在石蜡表面的铺展过程中,SAES具有较小的接触角和较大的铺展系数;对帆布片的润湿性、起泡性和稳泡性、乳化性、耐盐耐碱性较弱。

The optical microrheological properties,pour point,equilibrium and dynamic surface properties,spreadability and other properties of secondary alcohol polyoxyethylene ether sodium sulfate(SAES)were studied and compared with those of primary alcohol polyoxyethylene ether sodium sulfate(AES).The physicochemical properties indicated that with the increase of aging time,the viscoelasticity of SAES and AES increases,but the increase in SAES is smaller than that in AES.The pour point of SAES is significantly lower than that of AES.The surface performance showed that the critical micelle concentrations(cmc)of SAES and AES solutions were 0.44 mmol/L and 0.45 mmol/L,respectively.And the surface tension at cmc(γ_(cmc))of SAES and AES solutions was 27.71 mN/m and 30.77 mN/m,respectively.Compared with AES,the diffusion adsorption rate of SAES was faster at the air-water surface and the adsorption process of SAES and AES aqueous solution under low concentration was a hybrid control adsorption.The application performance showed that compared with AES,SAES has a smaller contact angle and a larger spreading coefficient during the spreading process on the surface of paraffin.Additionally,SAES demonstrated weaker wetting,foaming,foam stability,emulsification,and salt and alkali resistance on canvas sheets.