Research Information System
REACTIVE & FUNCTIONAL POLYMERS, vol.45, no.3, pp.235-242, 2000 (SCI-Expanded)
In this work, new magnetic particles were prepared in uniform and spherical form for the range 125 mu m < D-p < 250 mu m from nitrocellulose and magnetite through a modified solvent evaporation technique. The most appropriate solvent, dispersion medium, stabilization and surface active agents and stirring rate were determined as acetone and 1,2-dichloroethane mixture, glycerol, SDS and pluronic F68 together with PVA and 700 rev./min, respectively. The magnet abundant in nature, magnetite (D-p < 40 mu m), was successfully embedded in the particle structure during polymerization by an elaborated technique. Fine spherical particles with high magnetic quality (similar to 4.8 emu/g microbead at 6 kG magnetic field intensity) were produced for magnetically fluidized bed or magnetic filtration applications. Hydroxyl groups on the particle surface were activated with glutaraldehyde for the immobilization of a saccarifying enzyme, glucoamylase. (C) 2000 Elsevier Science B.V. All rights reserved.