Allyl Glucose / Acrylonitrile Copolymerization Of Membrane Separation Materials

The primary objective of this work is to modify polyacrylonitrile-based membrane material by the copolymerization of a -allyl glucoside (AG) and acrylontrile (AN). It is envisaged that membranes made from the copolymer of acrylontrile and a -allyl glucoside will combine the properties of high hydrophilicity, anti-fouling, and excellent bio- compatibility.a -Allyl glucoside was synthesized and its structure was characterized by FT-IR and H'-NRM. Novel sugar-containing copolymers were synthesized by the radical copoly- merization of a -allyl glucoside (AG) and acrylonitrile (AN) using AIBN as initiator. The effect of reaction time, initiator concentration, the ratio of the monomer feed, and different solvent on polymerization was studied. From the obtained results, it was found that the optimum condition for the solution copolymerization is: [I]/[M]= 1:500, reaction time =6 hours. Meanwhile, further research was carried out to investigate the AG/AN copolymerization by water-phase-precipitated procedure using KSiOg-NaHSOs as initiator. The effects of reaction temperature, initiator concentration, stirring rate, and pH on polymerization were also studied. The copolymers were characterized by FT-IR, JH-NRM spectroscopy. The composition of the copolymers was determined by element analysis. It was found that the optimum condition is: reaction temperature = 70癈, pH=2.0-3.5, [I]/[M]=1:500. When compared the water-phase precipitation copolymerization with the solution copolymerization, it was found that the molecular weight and the reaction yield by the water-phase precipitation copolymerization are much higher.The phase separation behavior of the systems, AG/AN copolymer-solvent (DMSO)- nonsolvent (F^O), was studied according to the linearized cloud point (LCP) correlation. It was found that the phase separation behavior of the systems agreed with the LCP correction. The binodal lines of the systems were calculated according to the LCP correlation. The results indicated that the binodal lines of the systems shifted away the AN/AG-DMSO axis with the increase of the AG in copolymer.The membranes prepared by immerse precipitation phase inversion method were characterized by water flux, BSA absorption, and SEM. The water flux increased with the increase of AG in copolymer. The BSA absorption decreased with the increase of AG in copolymer. It was found that the modified membranes have high hydrophilicity and good biocompatibility. As demonstrated by the SEM micrographs, the sheet membranes have denser inner surface and less porous sub-structure.