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[en] N-Vinyl-2-Pyrrolidone (NVP) was copolymerized with 2-(4-methoxy benzylidine)-malononitrile (MBM) monomers to form a new copolymer, P(MBM-co-NVP), containing nitrile groups. The characterization of copolymer and their modified with organic compounds such as thiourea, thiosemicarbazide,2-aminothiazole, N-Glycyl glycine, 4-amino-N-[5-methyl-3-isoxazolyl]benzene sulfonamide and 4-amino-N-[4-methyl-2-pyrimidnyl]benzene sulfonamide was carried out by Fourier transform infrared spectroscopy (FTIR), Elemental analysis (EA), Gel Permeation Chromatograph (GPC), Differential Scanning Calorimetry (DSC) and Thermal Gravimetric analysis (TGA). The changes in surface morphology of the prepared copolymer and its modified copolymers were observed by scanning electron microscopy (SEM). The biological activity of the modified copolymers with some organic compounds containing with or without sulfur was investigated. The results revealed that the biological activity of the modified copolymers was higher than that of the copolymer ones, under the same conditions. An improvement of prepared copolymers by modification with various organic compounds showed great promise in some practical applications in the field of antibacterial activity.