PSF-g-P(PEGMA)的合成及其共混超滤膜的制备与性能研究

以氯甲基化双酚A型聚砜(PSF-CH2Cl)为大分子引发剂,通过原子转移自由基聚合(ATRP)法合成了以聚砜(PSF)为疏水主链、聚(聚乙二醇单甲醚甲基丙烯酸酯)P(PEGMA)]为亲水侧链的梳状两亲性共聚物PSF-g-P(PEGMA).FT-IR和1H-NMR的表征结果证实了两亲性共聚物的生成.将PSF-g-P(PEGMA)与PSF进行共混,通过浸没沉淀法制备了共混超滤膜.研究发现,引入5 wt%的PSF-g-P(PEGMA),共混膜的孔隙率和平均孔径分别从65.9%和0.08μm提高到81.9%和0.18μm;将共混膜于90℃热水中浸泡24 h后,膜表面O/S从14.63提高到17.16;共混膜的亲水性和抗牛血清蛋白(BSA)吸附性能显著提升.

SYNTHESIS OF PSF-g-P(PEGMA) AND FABRICATION AND PERFORMENCE OF ITS BLEND ULTRAFILTRATION MEMBRANES

A novel amphiphilic copolymer having polysulfone(PSF) backbone and polypoly(ethylene glycol) methyl ether methacrylate] side chainsPSF-g-P(PEGMA)] was synthesized by ATRP,using chloromethylated polysulfone as macroinitiator.The resultant copolymer was characterized by FT-IR and()~1H-NMR.The molecular weight of PSF-g-P(PEGMA) was calculated as 6.34×10~4 based on()~1H-NMR analysis,the molar fraction and weight fraction of P(PEGMA) in the copolymer was 0.711 and 39.6 wt%,respectively.A series of PSF blend membranes containing various amounts of PSF-g-P(PEGMA) were prepared by the wet phase inversion process and were characterized by SEM,XPS,water contact angle and bovin serum albumin(BSA) adsorption.The experimental results showed that the introduction of PSF-g-P(PEGMA) can significantly improve the hydrophilicity and fouling-resistance of PSF membranes.For instance,the initial water contact angle of the PSF membrane containing 20 wt% PSF-g-P(PEGMA) was 43.5°.After 50 s,the blend membrane was completely wetted by water.The apparent BSA adsorption amount of the same membrane was extremely low compared to that of the pure PSF membrane.