High performance polymers such as polyamides, polyimides, poly(amide imide)s, poly(ester-imide)s, etc., have attracted great attention in recent years due to their unique combination of toughness, lightness and dimensional stability at high temperatures and resistance to thermooxidative degradation. In this regard, poly(amide imide)s (PAIs) have captured the attention of scientists and engineers alike as materials that offer outstanding properties for high performance applications. The objective of the present investigation was to synthesis soluble poly(amide imide)s containing tricomponent structures of dianhydride, diamine and acid chloride by low temperature solution polymerization method, following by thermal cycloimidization. The effect of structural changes (anhydrides and diamines) on the thermal and thermooxidative properties of the polymer was studied in detail. Further the kinetic aspects of thermal cycloimidization of poly(amide amic acid)s (PAAs) to the corresponding PAIs were also inspected by TGA and FT-IR techniques at different time intervals.