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In this thesis, the N-methyl- diethanolamine and bromooctadecane as raw materials , respectively, using the microwave, and the solvent-free synthesis method , synthesis of novel cationic surfactants octadecyl dimethyl hydroxyethyl ammonium bromide (OMDAB). By elemental analysis, infrared absorption spectrum , and 1 < / sup> H NMR spectral analysis identified the structure of the product . By response surface methodology (RSM) to establish a mathematical relationship between the model reaction conversion factors , of microwave synthesis octadecyl dimethyl hydroxyethyl ammonium bromide process optimization ; determine the best response The conditions were as follows : concentration of the reaction was 1.87 mol · L -1 , the microwave power of 570W , and the reaction time was 25min , the conversion rate was 95.30% . Compared with traditional methods , traditional methods of synthesis time of only 4.63% . Octadecyl dimethyl hydroxyethyl ammonium bromide, was synthesized by a solvent method optimum reaction conditions were : temperature 100 ℃, the reaction time of 180min , reactant molar ratio of 1:1 , the conversion rate was 95.02% . . Then 2L reactor enlarge synthetic enlarged during the experiment and yield factors affecting research and propose appropriate solutions . Test of the product of the surface activity and application performance , its surface tension 22.7N · m -1 , the critical micelle concentration of 3.18 × 10 -5 mol · L -1 , Clough points less than 0 ℃, the melting point of 120.02 to 120.82 ° C ; good solubilization and wetting force , the emulsifying properties , foaming properties , soft performance and bactericidal properties , as well as better maintenance fabric whiteness performance. Octadecyl dimethyl hydroxyethyl the bromide (OMDAB) surface with sodium dodecyl sulfate (SDS), sodium dodecyl benzene sulfonate satisfied (LAS), betaine compound system chemical properties, a water - soluble , synergistic effect. The results showed that , in very dilute solution , the complex nature of the system is stable , surface chemical properties significantly improved . The measured performance of the complex system applications , the results show that the part of the application performance of the complex system of varying degrees of improvement compared to a single system , in which the role of a synergistic effect significantly .
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