Preparation Of The Porous Membranes Via Atom Transfer Radical Polymerization And Their Adsorption Properties

Membrane separation technology is a common separation technique, the surface modification of membrane is important method to prepare separation membrane. Therefore, development of new modified technique is of great significance for the preparation of new membrane. In this work, surface-initiated atom transfer radical polymerization(SI-ATRP) methods were employed to modify polysulfone(PSF) membrene and regenerated cellulose(RC) membranes to prepare anti-fouling membrane and anion exchange membrane, and the results were obtained as following:(1) poly(glycidyl methacrylate)(PGMA) brushes were grafted from chloromethylated polysulfone (CMPSF) membrane surface by surface-initiated atom transfer radical polymerization and followed by hydrolysis of epoxy groups in the grafting chains. The anti-protein fouling property for modified membranes with different polymerization times were investigated. Membrane structure was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). Pure water flux, surface static contact angle, apparent rejection ratio and antifouling performance were also measured. The results show that the hydrophilicity and antifouling property of the modified membrane increased significantly. In comparison with the PGMA-grafted membranes, the hydrolyzed PGMA-grafted membranes have stronger hydrophilicity and improved antifouling property, the adsorption amount to BSA declined about77.4%compared to the unmodified membrane. It was also found that the hydrophilicity increased with the increase of the polymerization time. Therefore, the control of the hydrophilicity of PSF membrane could be realized through adjusting polymerization time.(2) Anion exchange membrane has been prepared via the reaction of RC membrane with2-bromoisobutyryl bromide, followed by grafting PGMA using ATRP, and finally by reacting with diethylamine. Modified membrane was characterized by FT-IR, XPS, SEM and the static binding capacity to BSA. The results show that adsorption capacities increase with the increase of polymerization time. At polymerization time is16h, the adsorption capacity is up to96mg/mL. Adsorption type belongs to the typical single-layer Langmuir adsorption model.