Polymerizable cationic gemini surfactant
Polymerizable cationic gemini surfactant
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DOI：
10.1021/la060156y
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发表时间：
2006-09-26
期刊：
影响因子：
3.9
通讯作者：
Sakai, Hideki
中科院分区：
文献类型：
--
作者：
Abe, Masahiko;Tsubone, Kazuyuki;Sakai, Hideki
合成了一种可聚合的阳离子双子表面活性剂[CH（2）dC（CH 3）COO（CH 2）（11）N+ CH 3）（2）CH 2]2中心点2Br（-），1，并研究了它的基本界面性质（在水中和0.05M NaBr存在下）。作为对比，还研究了对应于1，CH（2）dC（CH 3）COO（CH 2）（11）N+（CH 3）（3）中心点Br-，2的单体表面活性剂的性质。研究的参数包括cmc（临界胶束浓度），C-20（需要将溶剂的表面张力降低20 mN/m），γ（cmc）（cmc下的表面张力），cmc（空气/水界面处的最大表面过量浓度），A（min）（在空气/水界面处每个表面活性剂分子的最小面积）和cmc/C-20比率（相对于在空气/水界面处的吸附形成胶束的趋势的量度）。对于可聚合双子表面活性剂，1，在分子中的每个疏水基团的末端处的甲基丙烯酰氧基基团不与单层中的空气/水界面接触，而对于相应的单体表面活性剂，2，甲基丙烯酰氧基基团在界面处接触，形成环状构型，如bola两亲物。双子表面活性剂的聚合胶束是相当小的单分散和球形颗粒，平均直径为3 nm。
A polymerizable cationic gemini surfactant, [CH(2)dC(CH3) COO(CH2)(11)N+ CH3)(2)CH2]2 center dot 2Br(-), 1 has been synthesized and its basic interfacial properties were investigated (in water and in the presence of 0.05 M NaBr). For comparison, the properties of monomeric surfactant corresponding to 1, CH(2)dC(CH3) COO(CH2)(11)N+(CH3)(3)center dot Br-, 2, were also investigated. Parameters studied include cmc (critical micelle concentration), C-20 (required to reduce the surface tension of the solvent by 20 mN/m), gamma(cmc) (the surface tension at the cmc), cmc (the maximum surface excess concentration at the air/water interface), A(min) (the minimum area per surfacatant molecule at the air/water interface), and cmc/C-20 ratio (a measure of the tendency to form micelles relative to adsorb at the air/water interface). For the polymerizable gemini surfactant, 1, the methacryloxy groups at the terminal of each hydrophobic group in a molecule have no contact with the air/water interface in the monolayer, whereas for the corresponding monomeric surfactant, 2, the methacryloxy group contacts at the interface forming a looped configuration like a bolaamphiphile. Polymerized micelles of the gemini surfactant are fairly small monodisperse and spherical particles with a mean diameter of 3 nm.