紫外键联马来酸酐表面改性聚丙烯腈超滤膜

Modification of polyacrylonitrile ultrafiltration membrane surface with maleic anhydride by ultraviolet-initiated bonding

采用紫外光法将马来酸酐(MAH)单体键联到聚丙烯腈(PAN)超滤膜表面,考察了紫外光强度、辐射时间、光敏剂浓度以及单体浓度对MAH反应率的影响。采用衰减全反射-傅里叶红外光谱(ATR/FT-IR)、扫描电镜(SEM)和水接触角(CA)对改性膜和原膜进行表征,结果表明单体MAH已成功键联到PAN膜表面,膜表面的亲水性得到提高。蛋白质静态污染以及超滤实验表明马来酸酐键联改性对PAN膜水通量影响不大,但抗污染性能得到明显提高,且由于MAH含有酸酐基团,使PAN膜的可反应性大大提高,使PAN膜易于进一步改性。

Maleic anhydride （MAH） was bonded onto the surface of membrane by ultraviolet （UV）-initiated graft to improve the anti-fouling property of polyacrylonitrile （PAN） ultrafiltration membrane. The effect of UV radiation power,irradiation time, initiator and monomer concentrations on the reaction yield were investigated. Attenuated total reflectance Fourier transform infrared spectroscopy （ATR/FT-IR）,scanning electron microscopy （SEM） and water contact angle measurement were employed to characterize the structure and the properties of the membranes. The results revealed that MAH monomer had been bonded onto membrane surface successfully and the hydrophilicity of modified membrane was increased. The static protein pollution of membranes and ultrafiltration results were used to evaluate the anti-fouling property of the membranes. The results demonstrated that the water flux did not change obviously after MAH bonding. However, the anti-fouling property of the modified membranes was enhanced obviously. Furthermore , PAN membrane surface was functionalized by anhydride groups in MAH monomer which endowed the membranes with high reactivity.