摘要
以甲基丙烯酸二乙氨基乙酯（DEAEMA）和乙烯基磺酸钠（SVS）作为单体通过自由基聚合的方法合成了一种新型的CO2开关的高分子表面活性剂：聚（甲基丙烯酸二乙氨基乙酯-co-乙烯基磺酸钠）,命名为聚（DEAEMA-co-SVS）.通过表面张力和界面张力的测量研究了该物质的表面活性及CO2开关性能,并探究了该物质的CO2开关机理.研究表明：该聚合物能有效的将水的表面张力降低至37.279 mN/m,将甲苯/水的界面张力降至4.9 mN/m;聚合物水溶液在通入CO2时,叔胺基团在CO2的作用下发生了质子化作用,形成了大量的季铵盐,溶液由乳白色变为澄清态,并且其表面张力明显升高（42.636 mN/m）;在60℃下通入N2,叔胺基团失去质子化,溶液变回原始状态.将聚合物水溶液和甲苯混合能形成稳定的乳液,且该乳液能在通入或去除CO2时实现破乳和再乳化;甲苯的量不同均可以形成稳定的乳液并在通入CO2后破乳：聚合物水溶液浓度低于0.25 wt%时,形成的乳液不稳定.
A new CO2 -switchable polymer surfactant Poly （N, N- Diethylaminoethyl methacrylate -co- sodium vinylsnlfonate） （abbreviated as Poly （DEAEMA-co-SVS） ） was synthesized by N, N-Diethylaminoethyl methacrylate （DEAEMA） and sodium vinylsulfonate （SVS） via their free radical polymerization. The surface activity, CO2 response and its mechanism of the material were assessed by evaluation of its surface tension and interracial tension. The results show that the polymer effectively reduced the surface tension of water to 37.279 mN / m, and reduced that of toluene/water to 4.9 mN/m. Bubbling COa to the milky polymer aqueous solution, the tertiary amine groups in it undergo protonation under the action of COE, forming a large amount of quaternary ammonium salts, resulting the clarified state and its surface tension significantly increased to 42.636 mN/m. On the contrary, bubbling N2 at 60 ℃, aqueous solution converted to its original state. The tertiary amine groups are deprotonated, and the polymer Mixing the Poly （ DEAEMA - co - SVS ） aqueous solution with toluene, the mixture solution showed strong stability and CO2 response. Bubbling CO2 to or removing it from the mixture solution, its de-emulsification and re-emulsification process was observed, respectively. In addition, the mixture solution presented as a stable emulsion at varied concentration of toluene in it. However, the mixture solution showed poor stability when the concentration of Poly （DEAEMA-co-SVS） in it was lower than 0.25wt%.
作者
王金晶
田俐
郭珍
罗奇
刘强
Wang Jinjing;Tian Li;Guo Zhen;Luo Qi;Liu Qiang(School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;School of material science and Engineering, University of Science and Technology, Xiangtan 411201, China)
出处
《湖南科技大学学报（自然科学版）》
CAS
北大核心
2018年第2期77-83,共7页
Journal of Hunan University of Science And Technology：Natural Science Edition
基金
湖南省研究生科研创新资助项目(CX2016B540)
教育部新世纪优秀人才支持项目(NCET-13-0784)
湖南科技大学大学生科研创新计划资助项目(SYZ2016050)
