A novel CO2-responsive cationic spherical polyelectrolyte brush (SPB) was synthesized by photoemulsion polymerization, which was composed of a solid polystyrene(PS) core and poly (2-(dimethylamino)ethyl methacrylate) (PDMAEMA) shell densely grafted onto the core surface.The most important property of PS-PDMAEMA is the performance of CO2 response to Pickering emulsion which could employe CO2/N2 as a trigger.Dynamic light scattering (DLS), conductivity measurement, digital photography and polarizing microscope were used to characterize the emulsifying performance of PS-PDMAEMA microspheres.The results confirmed that PS-PDMAEMA was a CO2-responsive cationic spherical polyelectrolyte brush and could regulate the properties of Pickering emulsion with the help of CO2/N2.It could broaden the usage of CO2 as a green stimulation.%以聚苯乙烯(PS)纳米球为核,利用紫外光引发聚甲基丙烯酸N,N-二甲基氨基乙酯(PDMAEMA)接枝到PS纳米球上,得到对CO2有刺激响应的聚甲基丙烯酸N,N-二甲基氨基乙酯刷(PS-PDMAEMA).动态光散射(DLS)、电导率结果表明PS-PDMAMEA具有CO2刺激响应性.该微粒可以作为Pickering乳液的乳化剂,通过导入CO2或N2作为开关,进而破坏或稳定Pickering乳液.用数码照片、偏光显微镜等方法表征了乳液的稳定情况.结果表明:PS-PDMAEMA具有很好的CO2刺激响应性,利用PS-PDMAEMA作为乳化剂稳定Pickering乳液,仅仅依靠气体开关(CO2或N2)就可改变乳液的稳定性.
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