物理化学学报 >> 2007, Vol. 23 >> Issue (02): 253-257.doi: 10.3866/PKU.WHXB20070222

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可聚硼酸酯表面活性剂的表面化学性质及与LAS相互作用

王海鹰;李斌栋;户安军;吕春绪   

  1. 南京理工大学化工学院, 南京 210094
  • 收稿日期:2006-07-03 修回日期:2006-09-15 发布日期:2007-02-01
  • 通讯作者: 吕春绪 E-mail:haiyw25@163.com

Surface Activity of a Novel Borate Ester Surfmer and Its Interaction with LAS in Aqueous Solutions

WANG Hai-Ying;LI Bin-Dong;HU An-Jun;LU Chun-Xu   

  1. School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, P. R. China
  • Received:2006-07-03 Revised:2006-09-15 Published:2007-02-01
  • Contact: LU Chun-Xu E-mail:haiyw25@163.com

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摘要： 用表面张力法研究了可聚合硼酸酯表面活性剂(BES)水溶液不同温度下(288-313 K)的表面活性和热力学函数变化；考察了BES与十二烷基苯磺酸钠(LAS)在0.5 mol·L-1 NaCl溶液中的相互作用. 结果表明, 298 K时, BES临界胶束浓度cmc达到0.066 mmol·L-1, γcmc为29.2 mN·m-1；在所考察的温度范围内BES胶束形成自由能(ΔG0m)在-22.4 - -25.8 kJ·mol-1之间, 胶束形成是熵驱动过程. BES/LAS混合体系为具有较大负偏差的非理想体系, BES/LAS分子间平均相互作用参数βm=-3.48；当溶液体相中BES摩尔分数αBES＝0.5时, 混合胶束中BES摩尔分数X1m为0.46, |βm|达到最大, 而且此时混合溶液cmc为0.017 mmol·L-1, 达到最低, γcmc为27.8 mN·m-1.

关键词: 可聚合表面活性剂, 硼酸酯, 临界胶束浓度, 分子相互作用参数

Abstract: Using surface tension method, the changes of surface activity and thermodynamic properties of a novel borate surfactant surfmer (BES) in aqueous solution were studied at different temperatures (288-313 K). The interaction of BES with sodium dodecylbenzene sulfonate (LAS) in 0.5 mol·L-1 aqueous NaCl solutions was also measured. The results showed that the critical micelle concentration(cmc) of BES at 298 K was 0.066 mmol·L-1, and γcmc was 29.2 mN·m-1. The micellization free energie (ΔG0m) was in the range of -22.4 - -25.8 kJ·mol-1 at the experimental temperatures, and the process of micellization of BES was mainly driven by the entropy. The mixed BES/LAS solution was a non-ideal system with negative deviation, and the average molecular interaction parameter βm was -3.48. When the molar fraction αBES of BES in bulk solution was 0.5, its molar fraction X1m in mixed micelles was 0.46, |βm| could reach the maximum, cmc of the mixed solution reached the minimum 0.017 mmol·L-1, and γcmc was 27.8 mN·m-1.

Key words: Surfmer, Borate ester, Critical micelle concentration(cmc), Molecular interaction parameter