Study on the synthesis and performance of a responsive surfactant of tertiary amine type
A CO2-responsive surfactant with good surface activity was obtained,which was a long-chain tertiary amine(DMOA)with CO2 responsiveness.It was synthesized by bimolecular nucleophilic substitution reaction using oleic acid and N,N-dimethyl-1,3-propanediamine as raw materials and sodium fluoride as catalyst.Its conductivity was measured on a conductivity meter under the passage of CO2 and N2,and the experimental results confirmed that the solution of synthesized DMOA had CO2-responsive properties.The surface tension of DMOA compounded with counterions was measured and its critical micelle concentration was determined.It was found that the combination of DMOA with dicarboxylic counterions such as sodium oxalate could significantly reduce the surface tension of the solution,and the critical micelle concentration of the compounded system was also reduced compared with other systems.The CO2-responsive behavior of the viscosity of the DMOA-sodium oxalate system was studied on a rheometer.The results showed that the compounded system could significantly increase the viscosity of the system,exhibiting CO2-responsiveness and cyclic reversibility.The foaming performance of the compounded system was investigated,and the contact angle between its aqueous solution and paraffin wax was investigated.It was found that the compounded system exhibited lower foaming performance but smaller contact angle on lipophilic surface after the introduction of CO2.
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维普
