物理化学学报 >> 2005, Vol. 21 >> Issue (01): 6-9.doi: 10.3866/PKU.WHXB20050102

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C12-2-En-C12•2Br与SDS混合水溶液的胶团化研究

姜蓉;赵剑曦;张国城;游毅   

  1. 福州大学化学系,福州　350002
  • 收稿日期:2004-05-25 修回日期:2004-07-22 发布日期:2005-01-15
  • 通讯作者: 赵剑曦 E-mail:jxzhao.colloid@fzu.edu.cn

Study of Micellization of C12-2-En-C12•2Br and SDS Mixed Aqueous Solutions

JIANG Rong;ZHAO Jian-Xi;ZHANG Guo-Cheng;YOU Yi   

  1. Department of Chemistry, Fuzhou University, Fuzhou　350002
  • Received:2004-05-25 Revised:2004-07-22 Published:2005-01-15
  • Contact: ZHAO Jian-Xi E-mail:jxzhao.colloid@fzu.edu.cn

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摘要： 与[C12H25N＋(CH3)2CH2]2•2Br－(简记为C12-2-C12•2Br)/ C12H25SO4Na(SDS)混合水溶液相比,随着联接链上乙氧基团(E)数目增加,[C12H25N＋(CH3)2]2C2H4(OC2H4)n•2Br－(简记为C12-2-En-C12•2Br, n=2,3)与SDS混合水溶液澄清区域明显增大. C12-2-E3-C12•2Br/SDS混合胶团化过程中二组分产生了协同效应,理论预测在澄清区域所能达到的最小临界胶团总浓度(cmcT,min)= 0.0339 mmol•L－1,对应的SDS在溶液体相中的摩尔分数(x2*)=0.447.当水溶液体相中SDS摩尔分数(x2)=0.5时,混合胶团总聚集数(NT)=36,混合胶团中SDS的摩尔分数(x2M)=0.43.

关键词: C12-2-En-C12•, 2Br, SDS, 相图, 混合胶团化, 协同效应

Abstract: With increasing the number of oxyethylene groups in the spacer of [C12H25N＋(CH3)2]2C2H4(OC2H4)n•2Br－(C12-2-En-C12•2Br, n=2,3), the homogeneous regions in the phase diagrams of aqueous mixture of C12-2-En-C12•2Br with C12H25SO4Na (SDS) expand obviously in comparison with that of [C12H25N＋(CH3)2CH2]2•2Br－/SDS mixed system. There exists a synergism between C12-2-En-C12•2Br and SDS during the mixed micellization. The minimum critical micelle concentration (cmcT,min) in the homogeneous region is 0.0339 mmol•L－1 and the corresponding molar fraction (x2*) of SDS in the bulk solution is 0.447 estimated by Rosen theory. At x2=0.5, the corresponding molar fraction (x2M) in the mixed micelle and the total aggregation number (NT) are 0.43 and 36 respectively.

Key words: C12-2-En-C12•, 2Br, SDS, Phase behavior, Mixed micellization, Synergism