الفهرس 
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Abstract
The present thesis includes preparation, characterization and evaluation of the structural changes of the prepared systems. The present study can be divided into two basic sections. Section (I) concern ’’Structural properties and preparation of (Polyaniline and Carboxymethyl cellulose’’ in which prepared via in-situ polymerization method. Sections (II) concern ”Testing of structural properties and preparation of polymer nanocomposites with different amounts of silver nanoparticles” by the same techniques in section (I). X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), UV-visible, temperature- dependent DC conductivity and scanning electron microscopy (SEM) were used to test the physical, chemical and structure but antibacterial activity was used to test ability of polymer nanocomposites in biomedical applications. FTIR spectra of PANI-CMC-AgNps verified the successful incorporation of silver nanoparticles into the polymer nanocomposites, UV/Vis. spectra verified a good information about the optical properties, XRD analysis verified the information about nature (crystal/amorphous) lattice arrangement and revealed compatibility with the FTIR spectrum, SEM images explained a highly incorporation of AgNps into the polymer composites by studying porosity of the surface. The electrical property of the composites was examined by temperature-dependent DC conductivity in the range of 293– 373 ºK. The polymer composites exhibited higher electrical conductivities with increased AgNps concentration under equivalent conditions. Antimicrobial capacity evaluated against two gram positive bacteria (Staphylococcus aureus and Bacillus subtilis), two gram-negative bacteria (Escherichia coli and Pseudomonas aeuroginosa) and anti-fungal activities test against one fungus (Candida albicans) which all samples contained different content of silver nanoparticles showed a good antimicrobial properties specifically at high amount of silver nanoparticles.