利用废弃聚酯合成Gemini型表面活性剂

以废弃聚酯、乙二醇、氯化亚砜、十二烷基二甲基叔胺为原料，合成了含有酯基的季铵盐Gemini型表面活性剂。用正交试验法对试验条件进行优化，得出较优的合成工艺条件为：n(中间体)：n(十二烷基二甲基叔胺)=1:2.1，反应温度为57 ℃，反应时间为12 h。用红外光谱及显色反应对产物结构进行表征，同时测试了表面活性剂的表面张力、熔点、泡沫性能、溶解性能等。测试结果显示其临界胶束浓度值为1.47×10-4 mol/L，表面张力为28.56 mN/m，其表面活性明显低于工业常用的表面活性剂。

Synthesis of Gemini surfactant with waste polyester

A biquaternaryammonium salt surfactant with ester bond was synthesized using waste polyester,ethylene glycol,chlorinated sulfoxide and N,N-demethyldodecylamine.The optimum reaction conditions obtained by orthogonal experiment are as follows:n(intermediate):n(N,N-demethyldodecylamine)=1:2.1,reacting at 57℃for 1 2 h.The product structures were characterized by IR and color reaction.The surface tension,melting point,foaming and solving properties of the product were tested.It was found that its critical micelle concentration value is 1.47×10~(-4)mol/L and the surface tension value is 28.56 mN/m.The surface activity is obviously lower than that of commonly used commercial SUrfactants.