Citation: You Yi, Zheng Ou, Qiu Yu, Zheng Ye-Hong, Zhao Jian-Xi, Han Guo-Bin. Synthesis of Alkanediyl-α,ω-bis(Dimethyl Dodecylammonium Bromide) and their[J]. Acta Physico-Chimica Sinica, ;2001, 17(01): 74-78. doi: 10.3866/PKU.WHXB20010116
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Cationic Gemini surfactants, alkanediylα,ωbis(dimethyl dodecylammonium bromide) have been synthesized by the following method: firstly dodecyl bromide was prepared by the reaction of dodecanol with bromic acid in the presence of strong sulfuric acid. Dodecylbromide was then reacted with N,Ntetramethyl ethane diamine(or N,Ntetramethyl hexana diamine) to prepare the title compounds. Micellization of these Gemini surfactants was investigated using conductivity measurement. The results showed that the critical micelle concentration(cmc) of the Gemini surfactants has a much lower value compared with that of the corresponding “monomer”. For a series of the Geminis with the same length(s) in the spacer chain, the cmc decreased with increasing the carbon number (m) in the alkyl chain. The aggregation number(N) of the micelle also drastically decreased with m. For the same value of m, the cmc varied slightly with s, which indicated that the electrostatic interaction between the ionicgroups of the “monomer” has been naturally changed duo to a link between the two ionicgroups of the “monomer” through a spacer. However, N was strongly decreased with s,which may be a reason of steric inhibition coming from the ionicgroups due to a link of spacer. With increasing temperature, micellization of the Gemini surfactants was slightly enhanced.
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