学术
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—313K）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0．5mol·L^-1NaCl溶液中的相互作用．结果表明，298K时，BES临界胶束浓度cmc达到0．066mmol·L^-1，γcmc为29．2mN·m^-1；在所考察的温度范围内BES胶束形成自由能（△Gm^0）在-22．4--25．8kJ·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，刚达到最大，而且此时混合溶液cmc为0．017mmol·L^-1，达到最低，γcmc为27．8mN·m^-1,[著者文摘]
文章出处:
《物理化学学报》-2007年23卷2期 -253-257页
栏目信息:
分 类 号:
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 Lü, Chun-Xu （School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, P. R. China）
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 γwas 29.2 mN· m^-1. The micellization free energie （△Gm^0） was in the range of-22.4 - -25.8 kJ·mol^-1 at the experimental temperatures, and the process of micellizafion of BES was mainly driven by the entropy. The mixed BES/LAS solution was a nonideal system with negative deviation, and the average molecular interaction parameter βm m 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 γ was 27.8 mN·m^-1.[著者文摘]
Key words:
Surfmer; Borate ester; Critical micelle concentration（cmc）; Molecular interaction parameter
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