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用电导法、稳态荧光法和粘度法研究了二聚表面活性剂 C1 2 -s-C1 2 · 2 Br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 ,C1 2 -s-C1 2 · 2 Br的胶团生成能力远比其单体C1 2 TABr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
The length of the linker group (s = 2, 3, 4, 6) in the dimeric surfactant C1 2 -s-C1 2 · 2 Br molecule was investigated by conductivity method, steady state fluorescence method and viscosity method It is found that the micelle formation ability of C1 2 -s-C1 2 .2 Br is much stronger than that of its monomer C1 2 TABr, and the cmc value of the former decreases by one order of magnitude compared with the latter. The number N increased with the increase of the surfactant concentration c, and the value of N increased rapidly when c = 7.7mmol / L, and the calculated results showed that the micelle shape changed obviously , Forming an ellipsoidal micelle.The viscosity measurement results also confirmed this point