聚乙二醇在聚砜膜上的接枝与表征

对用紫外辐照法在聚砜膜表面接枝的聚乙二醇作了初步的研究。通过静态水接触角测定、X射线-光电子能谱分析以及原子力学显微镜等测试手段，对接枝前后聚砜膜表面的性能进行了测定，证明采用同步接枝法和二步接枝法在聚砜材料表面接上了聚乙二醇，表面亲水性大大提高，两种接枝方法的接枝覆盖率分别为77．3％和41．9％，表面形貌、相位图等参数较接枝前变化明显，说明用同步法在聚砜膜表面产生了分枝的聚乙二醇层，而二步法在聚砜膜表面产生了薄煎饼状的聚乙二醇层。这一研究为下一步拟在聚砜中空纤维膜表面接上聚乙二醇刷分子层打下了基础。

Grafting and Characterization of Poly(ethylene glycol) on Polysulfone Sheets

Grafting of poly(ethylene glycol)(PEG) on the surface of polysulfone(PSF) sheets by simultaneous or sequential UV irradiation with 4-azidobenzoic acid as the photocoupler was carried out.Water contact angle measurements showed that there was a great improvement of hydrophilicity on the grafted surface.X-ray photoelectron spectroscopy suggested that the area covered by PEG be 77.3% and 41.9% respectively after grafting by simultaneous and sequential pathways.With atomic force microscope(AFM),obvious difference in the shape and the phase mode was observed between surfaces of PEG-g-PSF sheets made by these two pathways. Evidences implied that simultaneous pathway would produce a branched PEG layer on the surface,while sequential pathway was coupled with a "pan-cake" PEG layer on it.This study provides the foundation for further advancement in tethering brush-like PEG on PSF hollow fiber membranes.