INVESTIGATION OF SYNERGISM DURING RADIATION GRAFT-COPOLYMERIZATION OFBINARY-MIXTURES OF VINYL MONOMERS ONTO DIFFERENT TEXTILE FABRICS BY ADYEING METHOD

Radiation-induced graft copolymerization of binary mixtures of acrylic acid (AAc) and styrene (S) onto cotton, cotton/polyester' and viscose rayon has been investigated. The different factors that may affect th e total graft yield (the sum of polyacrylic acid (PAAc) fraction and p olystyrene (PS) fraction, such as solvent composition, comonomer mixtu re, and irradiation dose were studied. It was found that there is alwa ys a certain solvent composition of (MeOH and H2O) and comonomer mixtu re at which a maximum value of total graft yield (TGY) was obtained. M oreover, the TGY was greatly influenced by other factors such as radia tion dosage. An attempt was made to investigate synergism during graft copolymerization, i.e. the effect of each monomer on the other and th eir participation in the resulting graft copolymer. In this respect, t he PAAc and PS graft fractions in the resulting graft copolymers of th e different textile fabrics under investigation were determined approx imately by dyeing with basic dye (Sandocryl Blue) and disperse dye (Sa maron Blue FBL). By this method, it was possible to determine each fra ction in the graft copolymer. It was also observed that the graft copo lymerization increased the dye affinity for such dyestuffs to a great extent. The accuracy and validity of the dyeing method applied was sup ported by the estimation of the carboxyl group content by analytical t echnique based on acid-base volumetric titration.