Filamentous cells of Trichoderma reesei were immobilized using a fibrous carrier covered with ionic-hydrophobic polymers, prepared by radiation copolymerization. The effect of the ionic properties of the polymers was investigated by changing the monomer composition in a trimethylpropane triacrylate (A-TMPT) - acrylic acid (AA) or methacrylic acid diethylaminoethyl ester (DEAEMA) system. More positive charge or less negative charge in the polymers led to an increase in the growth of the cells immobilized on their surface. Enzyme productivity in the immobilized cells with AA-A-TMPT polymer was higher than with a DEAEMA-A-TMPT polymer.