Insights into the mechanism of molecular imprinting by immersion precipitation phase inversion of polymer blends via a detailed morphology analysis of porous membranes

摘要: Porous membranes have been prepared by immersion precipitation phase inversion of cellulose acetate–sulfonated polysulfone (CA–SPS) blends with the compositions 85 : 15, 95 5 and 100 0 (wt%), molecularly imprinted polymer (MIP) materials, fluorescent dye Rhodamine B (RhB), Blanks, without template RhB, analysed scanning force microscopy (SFM), electron (SEM) gas adsorption isotherm method (BET). RhB binding data from solid extraction experiments allowed an estimation imprinting efficiency as a function blend composition: > 15 0. SEM revealed asymmetric cross-section morphology nodules in top layer macrovoids support which indicated instantaneous demixing overall mechanism solidification. at high resolution SFM enabled detailed analysis morphology, particular nodule size. Overall, significant differences pore structure between MIP Blank, composition were found; magnitude these differences, measured SEM, BET, clearly correlated efficiency. For CA–SPS blend, characteristic size was much smaller for than Blank. Hence, fixation sites occurred mainly small particles, formed during very fast upon contact non-solvent. Further, addition to solution seemed facilitate after bath water, presumably via complexation sulfonic acid groups SPS.