中文摘要：

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。

英文摘要：

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 PSPDMAEMA 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.