文章摘要
陈思雅,罗跃.超支化表面活性剂乳状液稳定性能研究[J].精细化工,2019,36(10):
超支化表面活性剂乳状液稳定性能研究
Experiment and analysis of emulsion stabilized by hyperbranched surfactants
投稿时间:2018-12-26  修订日期:2019-04-17
DOI:
中文关键词: 超支化表面活性剂  乳状液  pH响应  界面粘弹性  Zeta电位
英文关键词: Hyperbranched surfactant  Emulsion  pH response  Interface viscoelasticity  Zeta potential
基金项目:国家自然科学基金(纳米粒子调控交联聚合物凝胶触变性机制研究,51704035)
作者单位E-mail
陈思雅 长江大学 chensiy1989@163.com 
罗跃 长江大学 lyue1958@163.com 
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中文摘要:
      摘要:合成了系列HPSA超支化表面活性剂并对其进行了红外和元素分析。从宏观相分离、介观液滴粒度及微观界面膜稳定性3个不同尺度考察取代度、pH值、电解质浓度以及温度对乳状液稳定性的影响规律。结果表明;随着取代度的增加,HPSA的乳化能力呈现先增大后减小的趋势;HPSA具有pH响应,在酸性条件下疏水性较强,碱性环境下亲水性较,可以在较宽的pH值(6-11)范围形成稳定的乳状液;电解质浓度小于1.5?105mg/L时,Na 压缩双电层使得HPSA在油水界面上形成的界面膜强度增加,Zeta电位降低,乳状液稳定性增强;温度主要影响HPSA的分子热运动,使得HPSA形成的乳状液在界面膜上的碰撞几率增大,稳定性降低,乳状液在120℃以下稳定性较好。从微观上看,HPSA分子结构呈刚性,减弱了液滴间碰撞引起的界面膜的变化,在乳状液液滴碰撞过程中, HPSA分子不易随着液膜弯曲而流动;超支化表面活性剂在水溶液中自组装形成不同亲水/亲油性质的胶束聚集体,使其具有较强的增溶乳化原油的能力。
英文摘要:
      Abstract: A series of HPSA hyperbranched surfactants were synthesized and then analyzed by infrared and elemental analysis. This paper aims to studied the influence of dosage of N-lauryl monoamido sulfo-succinic acid, pH value, electrolyte and temperature on the stability of emulsion from three different aspects: macroscopic phase separation, mesoscopic droplet size and microscopic interface film stability. The results showed that the emulsification performance increased first and then decreased with the increase of substitution degree. HPSA has a pH response, which is more hydrophobic under acidic conditions, and more hydrophilic under alkaline conditions and it can form a stable emulsion in a wide pH range (6-11). By compressing the double charged by Na at the concentration 0-1.5?105mg/L, the strength of the interface film formed by HPSA at the oil-water interface is increased, the zeta potential is lowered, and the stability of the emulsion is enhanced. The temperature mainly affects the molecular thermal motion of HPSA, which makes the collision rate of the emulsion formed by HPSA on the interface film increase and the stability decreases. The stability of emulsion is better below 120℃. Microscopically, the molecular structure of HPSA is rigid, which weakens the change of interfacial film caused by droplet collision. HPSA molecule is not easy to flow with the curvature of the liquid film during the collision of emulsion droplets. Hyperbranched surfactants self-assemble in aqueous solution to form micelle aggregates with different hydrophilic/lipophilic properties, which makes it has stronger ability of solubilizing and emulsifying crude oil
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