Dissertation > Industrial Technology > Chemical Industry > Reagents and the production of pure chemicals > Surfactant

Switching containing amidine surfactant synthesis and application of research

Author WangLin
Tutor QiaoWeiHong
School Dalian University of Technology
Course Fine Chemicals
Keywords Amidino Switching Surfactants Vesicles Flocculant
Type Master's thesis
Year 2008
Downloads 267
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In practical applications, the surface active agent after the completion of its function, in the hope of their detachment from the system or loss of surface activity, the switch type surfactant is possible to solve this problem. Switch surfactant is a chemical and electrochemical methods, lead to the aqueous solution of surfactant molecular structure changes, so that the appropriate table (circles) the drastic change in the surface tension (20mN / m), some of the system surface properties of macroscopic changes that occur, that is, people can be adjusted according to your needs so that it has or does not have surface-active function. Change in the nature of this interface is reversible and can be regulated. This synthesis of a series of switching type surfactant, and their properties and applications were studied. In this paper, octyl amine, decyl amine, dodecylamine, fourteen and sixteen amines and amine-N, N-dimethylacetamide, dimethyl sulfate as raw materials, both by direct and indirect methods designed and synthesized five contain amidino group (-N = CN-) long carbon-chain group the tertiary amine compound; and that this series of reaction of a tertiary amine compound and dry ice, synthesized a series of switch type surfactant quaternary ammonium salt of bicarbonate. Determine the optimal conditions the tertiary amine compound: chloroform as solvent, phosphorus trichloride as a dehydrating agent and pH adjusting agent, the feed ratio of 1:3, the temperature is about 70 ℃ studied surfactant switching surface tension, and through its emulsifying and emulsifying and emulsion breaking performance of the switch. The results show that with the emulsifying properties of the emulsion-breaking decrease the hydrocarbon chain length becomes better, N'-dodecyl-N, N-dimethylacetamide bicarbonate amidino group has the best emulsification and breaking Milk performance. This article also dodecylamine, dimethyl acetamide and dimethyl sulfate was synthesized with a novel structure as the precursor amidino-tailed surfactant N, N'-bis dodecyl acetamidine base bicarbonate, using high-performance liquid MS, IR, 'H, 1 3C NMR, homonuclear correlation spectroscopy (gCOSY), heteronuclear correlation spectroscopy (gHSQC) and remote coupling spectrum (gHMBC) variety of NMR methods to determine its structure; it can reduce the surface tension of aqueous solutions to 24.69mNm -1 , its critical micelle concentration of 8.75 × 10 -5 M; the use of such a surfactant vesicles prepared successfully by transmission electron microscopy (TEM) observation to their vesicles. This article also acrylamide, dimethyl acetamide and dimethyl sulfate as raw material, containing amidine group to explore new cationic polyacrylamide flocculant polymer synthesis method by orthogonal experiment to study the temperature, single body content, the amount of initiator and the polymerization monomer ratio intrinsic viscosity and molecular weight of the polymer was studied, and its flocculation and switching performance, the results showed that: cationic polyacrylamide flocculant performance over N ' - propenyl-N, N-dimethyl-ethyl-amidino ratio of monomer to improve the increase, for a given polymer of a monomer ratio, higher molecular weight polymer has a better flocculation properties, the synthetic polymer all have a switching performance.

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