In this thesis the synthesis and characterization of novel amino acid-containing polyesters, polyamides, polyureas and polyimide/TiO 2 nanocomposites are investigated. At first a new diacid monomer containing L-methionine moiety was synthesized, characterized and then polymerized with different aromatic diole and diamines to obtain corresponding polyesters and polyamides, respectively. Resulted polymers were characterized by FT-IR, 1 H-NMR, specific rotation measurements, elemental analysis, differential scanning calorimetry and thermogravimetric analysis techniques. The results confirmed that obtained optically active polymers possess high organosolubility in dipolar aprotic solvents. In addition the use of microwave irradiation and ionic liquid as green reaction media was examined. The next part of investigations concerned the synthesis and characterization of novel L-leucine contaning nanocomposites. A new diamine monomer was synthesized and polymerized with pyromellitic dianhydride at room temperature to produced corresponding poly(amic acid). In continuation Ti(OEt) 4 and acetyl acetone were added and whole mixture underwent casting and then thermal imidization. The generated water as imidization byproduct hydrolyzed Ti +4 to titania nanoparticles via an insitu sol-gel process. Different percentage of polyimide/titania nanocomposites were synthesized by assuming the complete conversion of Ti +4 to titania. Obtained nanocomposites were characterized by means of thermogravimetric analysis, Transmission electron microscopy, Atomic force microscopy, FT-IR, UV-Vis and X-ray diffraction techniques. The results confirmed the insitu generation of almost spherical amorphous titania nanoparticles in the polyimide matrix. Increase the thermal stability and UV absorption of polymer matrix are some characteristics of synthesized new L-amino acid containing nanocomposite films. At last with the polymerization of the synthesized diamine and different diisocyanates new series of polyureas were obtained in organic solvent as well as ionic liquid media. Resulted polyureas showed excellent organosolubility in aforementioned solvents beside their good thermal stability which were confirmed via thermal gravimetric analysis.
