聚苯乙烯包覆Y_2O_3:Eu^(3+)颗粒及表征

Coating of Y_2O_3:Eu^(3+) Particles with Polystyrene and Its Characterization

采用柠檬酸表面修饰 Y2 O3:Eu3+颗粒 ,苯乙烯乳液聚合的方法 ,制备出核 -壳型的 Y2 O3:Eu3+ /聚苯乙烯颗粒 .在 FTIR谱图上 ,羰基伸缩振动峰向低波数位移 ;在 XPS谱图上 ,Y3d5 / 2 的电子结合能向高能方向移动 ,表明柠檬酸和颗粒表面发生键合作用 .说明此过程符合吸附层媒介作用机理 :柠檬酸使颗粒表面变成两亲性 ,从而使苯乙烯可吸附在颗粒表面形成包覆无机核的乳液结构 .

The core shell Y 2O 3:Eu 3+ /polystyrene particles were prepared by surface modification with citric acid, followed by emulsion polymerization of styrene. For the core shell particles the carbonyl stretching vibration band shifted to low wavenumber in FTIR spectrum and the binding energy of Y 3 d 5/2 upfield shifted to high energy band in XPS spectrum, showing that the citric acid is bonded to the particle surface through chemical binding by the mechanism of adsorption layer medium. The hydrophilic surface of Y 2O 3:Eu 2+ particles becomes amphiphilic by citric acid modification that makes the styrene adsorbed on particle surface to form emulsion structure with inorganic core inside. EDS spectra showed a uniform polystyrene coating on Y 2O 3:Eu 3+ surface.