十二烷基四甲基胍CO2开关表面活性剂的性能研究

合成并表征了十二烷基四甲基胍（DTMG）,研究了其可逆性能。结果表明,DTMG能与CO2形成离子化合物,可以选用CO2为开关控制其溶液的表面活性。向DTMG的溶液中通入CO2或加热CO2饱和的DTMG溶液,溶液的碱性以及表面张力等性质能可逆变化。该表面活性剂形成的乳液和泡沫亦能通过CO2在稳定与不稳定之间可逆变化。另外,通过简单的指示剂酚酞,由溶液的状态能够很容易用肉眼观察到：红色代表无表面活性,而无色则指示具有表面活性。该表面活性剂在工业领域具有重要的应用价值。

Reversible performance of dodecyl tetramethyl guanidine solution induced by CO2 trigger

Dodeeyl tetramethyl guanidine （DTMG） was synthesized and characterized, and its reversible performance was studied. The results showed that DTMG could form bicarbonate ionic adduct after exposed to CO2, so it could be used as CO2 switchable surfactants. By bubbling CO2 through DTMG solution or heating CO2 saturated DTMG solution, the alkali and surface active properties of solution was changed reversibly. Emulsion and foam stabilized by DTMG could be controlled between stable and unstable state by CO2. In addition, the state of DTMG solution was easy to be distinguished by naked eye through a simple indicator, phenolphthalein. Pink indicated it was inactive, and colorless indicated it was active.