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NaSal/2SHNC对R14HTAB体系自组装行为的影响机制
孙浩玉1,张琰2,高阳3,李嘉伟2,张英男2,燕友果2,张军2
(1.中国石化胜利石油工程有限公司钻井工艺研究院,山东东营 257000;2.中国石油大学(华东)材料科学与工程学院,山东青岛266580;3.中国石油新疆油田公司勘探开发研究院,新疆克拉玛依 834000)
摘要:
采用粗粒化分子动力学(CGMD)模拟方法研究水杨酸钠(NaSal)和2-羟基萘-3-羧酸酯(2SHNC)两种有机盐对阳离子表面活性剂3-烷氧基-2-羟丙基三甲基卤化铵(R14HTAB)自组装过程及组装体性能的影响。结果表明:球型胶束的形成经历成核、团簇融合2个阶段;蠕虫状胶束的形成经历成核、团簇融合和胶束融合3个阶段;囊泡形成经历成核、团簇融合、胶束融合、盘状胶束和盘状胶束卷曲5个阶段;与NaSal相比,2SHNC在低浓度下即能促进胶束融合自组装形成蠕虫状胶束,且能促进复杂胶束囊泡的形成,表现出更强的促进胶束融合能力;2SHNC形成的蠕虫状胶束体系在非轴向拉伸过程中表现出更强的抗拉强度,2SHNC/R14HTAB体系形成的蠕虫状胶束更长,得到的体系黏弹性更好。
关键词:  有机盐类型  阳离子表面活性剂  自组装  黏弹性
DOI:10.3969/j.issn.1673-5005.2019.06.021
分类号::TE 39
文献标识码:A
基金项目:国家重大专项子课题(2016ZX05022006);中央高校基本科研业务费专项(19CX05001A)
Effecting mechanism of organic salts NaSal/2SHNC on self-assembly of cationic surfactant R14HTAB
SUN Haoyu1, ZHANG Yan2, GAO Yang3, LI Jiawei2, ZHANG Yingnan2, YAN Youguo2, ZHANG Jun2
(1.Drilling Technology Research Institute of Shengli Petroleum Engineering Company Limited,SINOPEC, Dongying 257000, China;2.School of Materials Science and Engineering in China University of Petroleum(East China), Qingdao 266580, China;3.Research Institute of Exploration and Development, Xinjiang Oilfield Company, Karamay 834000, China)
Abstract:
The self-assembly process and the mechanical property of 3-alkoxy-2-hydroxypropyltrimethylammonium halide(R14HTAB) modulated by two kinds of organic salts of sodium salicylate (NaSal) and 2-hydroxynaphthalene-3-carboxylate (2SHNC) were investigated through the coarse-grained molecular dynamics (CGMD) simulation.The results show that the formation of spherical micelles undergoes two stages:nucleation and cluster fusion. The formation of worm-like micelles includes three stages:nucleation, cluster fusion and micelle fusion.And the vesicle formation has five stages:nucleation, cluster fusion, micelle fusion, disc-shaped micelles and disc-shaped micelle coiling. Compared with NaSal, 2SHNC presents stronger ability to promote micelle fusion, which can be confirmed by two facts:the first is that the work-like micelle could be obtained at lower 2SHNC concentration; the second is that the 2SHNC could promote to form more complex micelle of vesicle. Furthermore, the work-like micelle promoted by the 2SHNC exhibits stronger tensile strength tested by non-axial stretching, meaning that the 2SHNC could induce to form longer worm-like micelle and possesses better viscoelastic.
Key words:  organic salt type  cationic surfactant  self-assembly  viscoelasticity
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