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日用化学工业:2018,Vol.>>Issue(10):558-563
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连结基对甜菜碱型双子表面活性剂表面活性和泡沫性能的影响
赖小娟,刘佩,田伟,汪洁,惠艳妮,贾友亮
(陕西科技大学 陕西省轻化工助剂重点实验室,陕西 西安 710021)
Effects of the spacer on the surface activity and foaming properties of betaine Gemini surfactants
LAI Xiao-juan,LIU Pei,TIAN Wei,WANG Jie,HUI Yan-ni,JIA You-liang
(Shaanxi Key Laboratory of Chemical Additives for Industry, Shaanxi University of Science and Technology, Xi’an, Shaanxi 710021, China)
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投稿时间:2018-04-13    
中文摘要: 以3-氯-2-羟基丙烷磺酸钠、油酸酰胺丙基二甲基叔胺和溴代烷为原料合成了一系列甜菜碱型双子表面活性剂Cs-BGS(C为连结基中亚甲基,s=2,4,6)。采用FT-IR和1H NMR对产物进行了结构表征。分别使用吊片法和电导率法测定产物在25 ℃水溶液中的临界胶束浓度(cmc)。结果表明,随着连结基长度的增加,其平衡表面张力(γcmc)及cmc增加。C2-BGS的cmc最低,降低表面张力的效率(pc20)较高,在空气-水界面处有强烈的吸附,并且泡沫性能相对较好。此外,通过pc20、极限占有面积(Amin)、标准吸附自由能(ΔGadsº)和标准胶束化自由能(ΔGmicº)估算Cs-BGS的吸附和胶束化行为。结果表明,Cs-BGS的这些性质受连结基长度影响很大,且促进吸附行为的能力更强。
Abstract:A series of betaine-type gemini surfactants (Cs-BGS where C is the methylene of the spacer, s=2, 4, 6) were synthesized from sodium 3-chloro-2-hydroxypropanesulfonate, oleamidopropyl dimethylamine and bromoalkane. The chemical structure of the prepared compounds was characterized by FT-IR and 1H NMR. Their critical micelle concentration (cmc) in the aqueous solution at 25 ℃ was determined by Wilhelmy and electrical conductivity methods. The results show that with the increasing length of the spacer, the values of cmc and equilibrium surface tension (γcmc) are increased. C2-BGS has exhibited the lowest cmc, nice efficiency in reducing surface tension (pc20), strong adsorption at the air-water interface, and relatively good foaming performance. In addition, the adsorption and micellization behaviors of Cs-BGS were estimated by pc20, minimum surface area per molecule (Amin), standard adsorption free energy (ΔGadsº) and standard micellization free energy (ΔGmicº). The results show that these properties of Cs-BGS are significantly influenced by the length of the spacer, and the ability to promote adsorption is stronger than to promote micellization.
文章编号:     中图分类号:TQ423    文献标志码:
基金项目:陕西省青年科技新星项目(2018KJXX-023);陕西省教育厅重点实验室项目(17JS012);西安市科技计划资助项目(2017068CG) 陕西省青年科技新星项目(2018KJXX-023);陕西省教育厅重点实验室项目(17JS012);西安市科技计划资助项目(2017068CG)
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