Microscopic characterization of porosity and chemical modification of acrylonitrile copolymer networks

摘要

The effects of different kinds of diluents (porogen agents), namely, toluene (TOL), n-heptane (HEP), anisole (ANI) and mixtures of them, on the porous structure of copolymer networks based on acrylonitrile (AN) and divinylbenzene (DVB) prepared by suspension polymerization were analyzed by microscopic analyses [both optical (OM) and scanning electron microscopies (SEM)]. It was noted that all synthesized resins have presented dispersed particles size, and that their porosities were dependent on the type of diluent employed in their syntheses. The amidoximation of cyano groups of AN-DVB copolymers employing two kinds of treatment with hydroxylamine under alkaline solution was also studied.