C 12-6-C 12·2Br violently interacts with sodium dodecyl sulfate(SDS) leading to the formation of mixed micelles. When molar fraction(x 2) of C 12-6-C 12·2Br in the bulk solution was 10.0%, the total critical micelle concentration(cmc T) of the mixed solution was found to be 0.043 7 mmol/L, and the micelle aggregation number N T and the molar fraction(xM 2) of C 12-6-C 12·2Br in the mixed micelle were 17.4 and 49.0%, respectively. With x 2 increased to 16.7%, cmc T further decreased and N T gradually increased, but xM 2 almost remained unchanged. The average value of the interaction parameter(β M) calculated by the theory of regular solution equals to -33.3.
合成了含氧乙烯联接链的季铵盐Gemini表面活性剂C12 2 En C12·2Br〔C12=C12H25N+(CH3)2,2=CH2CH2,En=(OC2H4)n,2Br=2Br-,n=1,2,3〕。以电导和稳态荧光法研究了胶团化行为,结果表明,C12 2 En C12·2Br的胶团化能力比其单体表面活性剂十二烷基三甲基溴化铵(C12TABr)高得多,接近于以2个亚甲基构成联接链的C12 2 C12·2Br。胶团聚集数N和表面反离子结合度K0也与C12 2 C12·2Br胶团相当。C12 2 En C12·2Br胶团化过程呈现焓/熵补偿现象,以n=1的胶团最为稳定。
