CO₂-responsive aliphatic tertiary amine- modified alginate and its application as a switchable surfactant.

Jisheng Yang*, Hongbiao Dong

School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, China

A new kind of hexyl diethyl tertiary amine-grafted amphiphilic alginate derivative (HDEA-Alg) was synthesized from (6-bromo-hexyl)-diethyl-amine (BHDEA) and sodium alginate (NaAlg) through esterification. The structure of HDEA-Alg was confirmed by FT-IR and NMR spectroscopies. The grafting ratio was calculated according elemental analysis and thermodynamic property was analyzed by TG. The CO2/N2-responsive performance of HDEA-Alg in aqueous solution was demonstrated by surface tension and conductivity measurements. Stable emulsions of liquid paraffin were easily prepared in the presence of the HDEA-Alg. These emulsions can be de-emulsified by bubbling CO₂through the emulsions at 5℃for 30 min, resulting in complete oil/water phase separations. They can be re-emulsified by bubbling N₂through the solutions at 50℃for 30 min with the aid of homogenization.

文章发表信息：Carbohydrate Polymers. 2016, 153: 1-6.

文章链接：http://dx.doi.org/10.1016/j.carbpol.2016.07.079