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通过电导法、粒度法、光谱及热分析等方法研究了羧甲基淀粉与十六烷基三甲基溴化铵之间的相互作用。结果表明,在较低表面活性剂浓度下,静电作用使得羧甲基淀粉与十六烷基三甲基溴化铵发生复合,这一浓度比单一表面活性剂的临界胶束浓度(cmc)低1个数量级;但随表面活性剂的增加,复合物溶液经历澄清-混浊-澄清过程,说明表面活性剂起到了加溶作用。盐的加入降低了复合物的粒径,起到一定的促溶作用。热重分析表明二者的复合物分解温度升高,等电点下季铵盐完全取代了Na+。
The interaction between carboxymethyl starch and cetyltrimethylammonium bromide was studied by conductivity method, particle size method, spectroscopy and thermal analysis. The results show that at lower surfactant concentrations, the electrostatic interaction causes the carboxymethyl starch to complex with cetyltrimethylammonium bromide, which is lower than the critical micelle concentration (cmc) of the single surfactant 1 order of magnitude. However, with the increase of surfactant, the complex solution underwent a clarification-turbidity-clarification process, indicating that the surfactant played a solubilization role. The addition of salt reduces the particle size of the complex and plays a role of promoting solubilization. Thermogravimetric analysis showed that the decomposition temperature of the two compounds increased, the quaternary ammonium salt at the isoelectric point completely replaced Na +.