新型表面活性剂的表面张力和电导率性能研究

合成了三种孪连型阳离子季铵盐表面活性剂16-4-16,2Br-1、14-4-14,2Br-1、18-2-18,2Br-1,对三者的性能进行评定,分别通过表面张力和电导率测得临界胶束浓度(CMC)、表面活性剂在气-液界面的吸附量、单个分子的面积和胶束电离度α。结果表明:首先,相对于单头基单尾链的表面活性剂,三种孪连表面活性剂的表面活性更强,CMC值更低;其次,三种表面活性剂都有其各自的特性,16-4-16,2Br-1的粘弹性能较好,而14-4-14,2Br-1、18-2-18,2Br-1表面张力很低。实验表明,通过调节孪连表面活性剂联结基和疏水链的长度会对产品的性能有很大的影响。

Study on Surface Tension and Electrical Conductivity of Cationic Gemini Surfactants

Three kind of cationic Gemini surfactants have been synthesized.Surface tension and electrical conductivity of their aqueous solutions at different concentration have been measured.From these experimental date, the critical micelle concentration(CMC),excess absorption amount at vapor-liquid interface,the area per molecule and the degree of ionization of micelle have been obtained.Results show that Gemini surfactants have much lower CMC and stronger surface tension comparing with the corresponding monomer conventional surfactants.On the other hand,this three surfactants have three deferent properties respectively.The spacer chain length and hydrophobic chain has a great influence on the properties of aqueous Gemini surfactants.