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化学学报
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化学学报 ›› 2011, Vol. 69 ›› Issue (20): 2385-2392. 上一篇    下一篇

研究论文

温敏性P(St-NIPAM)/PNIPAM-Ag复合微凝胶制备及性能研究

吕美丽，李国梁，李超，陈慧强，张颖*   

  1. (应用表面与胶体化学教育部重点实验室 陕西师范大学化学与材料科学学院 西安 710062)
  • 投稿日期:2011-02-26 修回日期:2011-05-15 发布日期:2011-06-09
  • 通讯作者: 张颖 E-mail:zhangy@snnu.edu.cn
  • 基金资助:

    纳米结构型单分散有机/无机杂化微球制备新方法;抗辐射性核-壳型复合微球材料的制备研究

Preparation and Properties of Thermosensitive P(St-NIPAM)/PNIPAM-Ag Composite Microgels

LV Mei-Li, LI Guo-Liang, LI Chao, CHEN Hui-Qiang, ZHANG Ying   

  1. (Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Materials Science, Shaanxi Normal University, Xian 710062)
  • Received:2011-02-26 Revised:2011-05-15 Published:2011-06-09
  • Contact: Ying ZHANG E-mail:zhangy@snnu.edu.cn

PDF

2125

被引次数

29

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.

关键词: 聚-N异丙基丙烯酰胺, 纳米银, 复合微凝胶, 温度敏感性, 对硝基苯酚还原

Poly(styrene-co-N-isopropylacrylamide)/poly(N-isopropylacrylamide) [P(St-NIPAM)/PNIPAM] composite microgels with core-shell structures were synthesized by two-step reaction including a surfactant-free emulsion polymerization and a seed emulsion polymerization method. P(St-NIPAM)/PNIPAM composite microgels were fully swollen in AgNO3 aqueous solution. Using alcohol as reducing agent, P(NIPAM-St)/PNIPAM-Ag composite microgels loaded with Ag nanoparticles were prepared in the atmosphere of ammonia gas via polymer microgel template technique. The structures, components and properties of the prepared composite microgels were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), UV-visible spectrophotometer (UV-vis) and laser particle size analyzer. It was demonstrated that P(St-NIPAM)/PNIPAM-Ag also showed thermosensitivity, and the thermosensitivity was weaken with the inceasing of the loading amount of Ag nanoparticles on the shell layer. P(St-NIPAM)/PNIPAM-Ag composite microgels as a catalyst has excellent perfomance for reduction 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) within 45 min.

Key words: poly(N-isopropylacrylamide), silver nanoparticle, composite microgel, thermosensitivity, 4-nitrophenol reduction