采用间歇式紫外辐照法,以聚砜(PSF)和聚丙烯(PP)中空纤维膜为探针,以丙烯酸(AA)和丙烯酸羟乙酯(HEA)为单体,研究光敏剂对膜表面紫外接枝反应的影响。结果表明,光敏剂存在与否对膜表面结构有较大影响。无光敏剂时,PSF中空纤维膜表面虽有亲水性单体成功接枝,但PSF膜基体结构受到损伤,表面孔结构增大,改性膜的截留率降低;存在光敏剂时,PSF和PP中空纤维膜表面均有单体成功接枝,膜表面结构得到调控,改善了膜的亲水性和抗污染性,为亲水性膜的表面结构设计提供了一定的理论基础,对新型亲水膜的制备具有指导意义。
Acrylic acid (AA) and hydroxy ethyl acrylate (HEA) were grafted on the surfaces of polysulfone(PSF)and polypropylene(PP)hollow fiber membranes by intermittent UV irradiation,the effect of photosensitizer (BP) on the membrane structure and performance were studied.Results showed that the surface structure of membrane was greatly influenced by BP.Monomers can be grafted on the PSF membrane surface after UV irradiation when there was no BP,but the membrane structure was damaged and the pores of membrane were enlarged and the rejection rates were reduced,and the monomers can't be grafted on the PP membrane without BP.While in presence of BP,the monomers can be grafted on PSF and PP membrane surface successfully after UV irradiation,the surfaces were regulated and the hydrophilicity and anti-fouling performance of membranes were improved.It provided theoretical basis for the structure design of hydrophilic membrane surface and had guiding significance for the preparation of new type of hydrophilic membranes.
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基金资助
国家自然科学基金项目(51678409、41301542);天津市科技支撑计划(15ZCZDSF00880)
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