The characterization of porous styrene glycidyl methacrylate copolymer beads prepared by suspension polymerization

Large, cross-linked polymer beads have been produced by suspension polymerization. The surface area of the beads can be increased by making the structure porous by the addition of an inert solvent to the droplet phase. Kinetic measurements have been performed with systematic changes in monomer ratio (styrene-glycidyl methacrylate), with an increase in glycidyl methacrylate concentration leading to an increase in reaction rate. The effects of changing the initiator type have also been studied; the use of azobisisobutyronitrile, as opposed to benzoyl peroxide, results in higher reaction rates and higher yields. The effects of these variations on both the emulsion and bead droplet size distributions have also been studied. An increase in styrene concentration has no significant effect on the average size of the emulsion droplets, but increases the final bead size. The average pore size and specific surface areas of the polymer beads (determined from BET isotherms) have also been investigated. (C) 1998 Elsevier Science B.V. All rights reserved.