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nirenjie0627(½ð±Ò+30, ·­ÒëEPI+1):лл£¬¸÷·ÖÒ»°ë°É£¡ 2010-12-05 19:57:32
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The Gemini cationic surfactant was composed from the bromination and quaternization of the raw solution, which was obtained by dissolving diethylene glycol, phosphorus tribromide and tertiary amine in isopropanol solvent. Structure characterization of the reaction product, recrystaled from ethanol-ethyl acetate mixture, was carried out through IR and1 HNMR. The content was determined to be more than 95% by means of diphasictitration -with bromophenol blue as the indicator and chloroform as the dispersed phase- which, is a more trouble-saving method than those demanding demarcation of anionicsurfaceactiveagent standard solution in references, and also,more efficient and accurate. The as-composed high-purity Gemini cationic surfactant guarantees the reliability of subsequent theoretical research of solubilization and phase behavior.
2Â¥2010-12-05 02:16:19
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nirenjie0627(½ð±Ò+30):лл£¬¸÷·ÖÒ»°ë°É£¡ 2010-12-05 19:58:21
The Gemini cationic surfactant was synthesized though the method of bromination and quaternization, using diethylene glycol, phosphorus tribromide,  tertiary amine with different lengths of alkyl chains as raw materals and isopropanol as the solvent. The re-crystalizated product from ethanol-ethyl acetate mixture, was characterizated by IR and1 HNMR. The content of surfactant was determined with diphasictitration - bromophenol blue as the indicator, chloroform as the dispersed phase, and the purity of the surfactant product was more than 95%. This method is a time-saving, more efficient and accurate, as compared with the previous method from the reference.  Besides, the demarcating of anionicsurfaceactiveagent standard solution in the reviously determined precedure was cancelled. The as-synthesized Gemini cationic surfactant with high purity is benefical to the theoretical research in solubilization and phase behavior.
3Â¥2010-12-05 02:51:50
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