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(ΔGm0)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,｜βm｜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.
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.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2007年第2期253-257,共5页
Acta Physico-Chimica Sinica
