A Facile Method for Surface Modification of Nano-SiO2 via ATRP and Click Chemistry

摘要：

1.Introduction Atom transfer radical polymerization (ATRP)1-3 is a particularly attractive CRP process for synthesis of chain-end-functionalized polymers.The polymers produced by ATRP preserve terminal halogen atom(s) that can be successfully converted into various desired functional chain-end groups through appropriate transformations,especially nucleophilic substitutions. Click reactions have recently emerged as a powerful and versatile class of chemical transformations. The popularity of these reactions can be attributed to their mild conditions, quantitative yields, absence of by-product formation, and regioselectivity4.Click chemistry reactions include the Cu-catalyzed azide/alkyne cycloaddition5,usually known as Huisgen 1,3-dipolar cycloaddition,which has recently been employed to prepare a variety of novel materials including dendrimers, shell-cross linked nanoparticles, hydrogels, and (co)polymers with high degrees of functionalization. This technique is particularly well suitable with polymers prepared by ATRP owing to the controlled molecular weight and narrow molecular weight distribution of the resulting polymers as well as the quantitative presence of halogen end groups that can be readily converted into azido functions6-7. Moreover, ATRP shares a number of important features with click reactions including robustness,versatility, tolerance to a wide range of functional groups, and the catalytic use of a ligated transition metal as copper(Ⅰ) complexes.Recently, the controlled construction of complex amphiphilic nanostructures based on the living polymerization approach has received significant attention for both scientific and technological reasons. Although excellent work on amphiphilic hybrid nanospheres and macromolecular nanowires has been published, amphiphilic SiO2 nanoparticles that those based on click chemistry of polymer building blocks have been rarely reported.

关键词： nano-SiO2, surface modification ATRP click chemistry

作者: Jiucun Chen Yunpu Wang Yongqian Shen Shoucun Zhang

作者单位: Institute of Polymer,Northwest Normal University,Key Laboratory of Polymer Materials of Gansu Provin Institute of Polymer,Northwest Normal University,Key Laboratory of Polymer Materials of Gansu Provin

会议类型: 国际会议

会议名称: 18th International Symposium on Fine Chemistry and Functional Polymers,4th IUPAC International Symposium on Novel Materials and Their Synthesis(第18届国际精细化学和功能高分子学术讨论会暨第四届IUPAC 国际新型材料及其制备学术讨论会)

会议地点: 江苏镇江

会议语种:英文

页码: 240-241

在线出版日期: 2008-10-15（万方平台首次上网日期，不代表论文的发表时间）