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通过无皂乳液聚合和种子乳液聚合两步法合成苯乙烯与N-异丙基丙烯酰胺共聚物/聚N-异丙基丙烯酰胺[P(St-NIPAM)/PNIPAM]核-壳结构复合微凝胶,再以其为模板在硝酸银水溶液中充分溶胀,并以乙醇为还原剂,在NH3气氛条件下还原,制备得到高分子微凝胶负载纳米银P(St-NIPAM)/PNIPAM-Ag的复合微凝胶材料.通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、傅里叶变换红外光谱仪(FT-IR)、X射线衍射仪(XRD)、热分析(TGA)、紫外-可见分光光度计(UV-vis)、激光粒度分析等手段对复合微凝胶进行结构、组成和性质表征.研究结果表明,复合纳米银后的P(St-NIPAM)/PNIPAM-Ag复合微凝胶仍具有温敏性,且其温度敏感性随壳层中复合纳米银含量的增加而减弱.P(St-NIPAM)/PNIPAM-Ag复合微凝胶对对硝基苯酚的还原反应具有良好的催化活性,在45 min内基本将对硝基苯酚催化还原为对氨基苯酚.
Synthesis of styrene-N-isopropylacrylamide copolymer / poly (N-isopropylacrylamide) [P (St-NIPAM) / PNIPAM] core-shell composite microstructure by soap-free emulsion polymerization and seed emulsion polymerization Gel, and then use it as a template to fully swollen in a silver nitrate aqueous solution, and use ethanol as a reductant to reduce in an NH3 atmosphere to prepare a polymer microgel-loaded nano-silver P (St-NIPAM) / PNIPAM-Ag (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermal analysis (TGA), UV- The structure, composition and properties of the composite microgels were characterized by visible spectrophotometer (UV-vis) and laser particle size analysis.The results showed that P (St-NIPAM) / PNIPAM- Gel still has temperature sensitivity, and its temperature sensitivity decreases with the increase of composite nano-silver content in the shell.The P (St-NIPAM) / PNIPAM-Ag composite microgel has a good reduction of p-nitrophenol Catalytic activity, the basic reduction of p-nitrophenol to p-aminophenol within 45 min.