高等学校化学学报

高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (7): 1352.

• 研究论文 • 上一篇    下一篇

连接基团链长度对季铵盐二聚表面活性剂C12-s-C12·2Br在水溶液中胶团化行为的影响

郑欧, 赵剑曦, 游毅   

  1. 福州大学化学系, 福州 350002
  • 收稿日期:2001-06-13 出版日期:2002-07-24 发布日期:2002-07-24
  • 通讯作者: 赵剑曦(1953年出生),男,博士,教授,从事胶体与界面科学研究.E-mail:jxzhao.colloid@fzu.edu.cn E-mail:jxzhao.colloid@fzu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:20173010);福建省自然科学基金(批准号:E0110012)资助

Effect of Spacer Chain Length on Aggregation of C12-s-C12·2Br Dimeric Surfactants in Aqueous Solutions

ZHENG Ou, ZHAO Jian-Xi, YOU Yi   

  1. Department of Chemistry, Fuzhou University, Fuzhou 350005, China
  • Received:2001-06-13 Online:2002-07-24 Published:2002-07-24

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摘要： 用电导法、稳态荧光法和粘度法研究了二聚表面活性剂C12-s-C12·2Br分子中的连接基团链长度(s=2,3,4,6)对其在水溶液中聚集行为的影响.实验发现,C12-s-C12·2Br的胶团生成能力远比其单体C12TABr强得多,前者cmc值较后者降低一个数量级.胶团聚集数N随表面活性剂浓度c的增大而增大,其中当s=2时的N值在c=7.7mmol/L后开始急剧增大.计算结果表明,此时胶团形状发生了明显变化,形成了椭球形的胶团.粘度测定结果也证实了这一点.

关键词: 二聚表面活性剂, 连接基团链长影响, 胶团形成, 胶团结构

Abstract: Effect of spacer chain length on aggregation of C12-s-C12·2Br dimeric surfactants in aqueous solutions has been investigated by using conductivity and viscosity measurements as well as steady fluorescence quench technique. The results showed the ability for the micelle formation of C12-s-C12·2Br dimeric surfactants is much better than that of their monomer, dodecyltrimethylammonium bromide(C12 TABr). The values of cmc for the former are lower than an order compared with the latter. The aggregation number Nof C12-s-C12·2Br micelles decreases with increasing concentration c, specially for s=2, the value of Nincreases rapidly at c>7.7 mmol/L. The calculated result indicates a significant change in the micellar shape and the formation of prolate ellipsoid micelles at c>7.7 mmol/L. The viscosity measurement for C12-2-C12·2Br micellar solutions demonstrates the calculated results.

Key words: Dimeric surfactants, Effect of spacer chain length, Micelle formation, Micelle structure

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