摘要
为深入分析表面活性剂在流体界面上的吸附机制,利用界面张力弛豫方法,研究2-羟基-3-辛基-5-癸基苯磺酸钠(C_(8)C_(10))和2-羟基-3-癸基-5-辛基苯磺酸钠(C_(10)C_(8))在空气-水表面和癸烷-水界面上的扩张流变性质,考察羟基邻位烷基链长度变化对分子界面行为的影响,获得表面活性剂结构对极限扩张弹性、扩张黏性最大峰值以及相关特征频率的浓度依赖性的影响规律。结果表明:羟基取代烷基苯磺酸盐分子中羟基邻位的长链烷基倾向于沿界面伸展,表现出较强的分子间相互作用;对于表面吸附膜,界面分子重排的慢过程控制膜性能,羟基邻位烷基链长越大,膜强度越大,C_(10)C_(8)极限扩张弹性高达178 mN/m,扩张黏性最大值约62 mN/m;对于界面吸附膜,扩散-交换过程控制膜性质,邻位长链烷基的影响变小。
In order to deepen the understanding of the mechanism responsible for surfactant adsorption on fluid interface,interfacial dilational rheological properties of sodium 2-hydroxy-3-octyl-5-decyl benzene sulfonate(C_(8)C_(10))and sodium 2-hydroxy-3-decyl-5-octyl benzene sulfonate(C_(10)C_(8))at air-water and decane-water interfaces were investigated by interfacial tension relaxation method.The effect of hydroxyl ortho alkyl chain length on molecular interfacial behavior has been expounded.The influences of surfactant structures on the concentration dependences of limiting dilational elasticity,maximum of dilational viscosity and involving characteristic frequencies have been obtained.The results show that the long-chain alkyl groups adjacent to hydroxyl groups in hydroxy-substituted alkylbenzene sulfonates tend to extend along the interface,which shows the stronger intermolecular interactions.For the surface adsorption film,the slow process of interfacial molecular rearrangement controls the properties of film.The longer the hydroxyl ortho alkyl chain,the greater the film strength.The limiting dilational elasticity of C_(10)C_(8) solutions is up to 178 mN/m and the maximum of dilational viscosity is 62 mN/m.For the interfacial adsorption membrane,the diffusion exchange process controls the membrane properties,and the influence of long-chain ortho alkyl becomes smaller.
作者
杨风斌
王玉江
蒿秋军
严峰
YANG Feng-bin;WANG Yu-jiang;HAO Qiu-jun;YAN Feng(Gudong Oil Production Plant,Sinopec Shengli Oilfield Company,Dongying 257237,Shandong Province,China;En-gineering Technology Management Center,Sinopec Shengli Oilfield Company,Dongying 257000,Shandong Province,China;Steam Injection Technology Service Center,Sinopec Shengli Oilfield Company,Dongying 257000,Shandong Province,China;School of Chemistry and Chemical Engineering,Tiangong University,Tianjin 300387,China)
出处
《天津工业大学学报》
CAS
北大核心
2021年第5期42-48,共7页
Journal of Tiangong University
基金
国家重点研发计划资助项目(2019YFA0708700)。
关键词
羟基取代烷基苯磺酸盐
表面吸附
界面吸附
界面张力弛豫
极限扩张弹性
hydroxy-substituted sodium alkyl benzene sulfonate
surface adsorption
interfacial adsorption
interfacial tension relaxation
limiting dilational elasticity
