1 Results and DiscussionTwo diamines 1,4-phenylene di(oxy-4,4′-aniline) and 4-aminophenyloxy-N-4-[(4-amiophenyloxy)benzylidene]aniline were prepared via the nucleopilic substitution reaction and were polymerized with 3,3′,4,4′-benzophenonetetracarboxylic acid dianhydride (BP), 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (HF) , 3,4,9,10-perylenetetracarboxylic acid dianhydride (PD) and pyromellitic dianhydride (PMDA) either by one step solution polymerization reaction or two step procedure. The later includes ring opening polyaddition to give poly (amic acid), followed by cyclodehydration to polyimides. These polymers had inherent viscosities ranging from 0.61-0.83 dL/gm. Few of the polymers were soluble in most of the organic solvents such as DMSO, DMF, DMAc, NMP and m-Cresol even at room temperature and some were soluble on heating. The degradation temperatureof the resultant polymers falls in the ranges from 240-500 ℃ in nitrogen (with only 10% weight loss). Specific heat capacity at 200 ℃ ranges from -4.032 2-2.627 5 Jg-1·K-1. The maximum degradation temperature ranges from 550-630 ℃.Tg values of the polyimides ranged from 185 to 272 ℃.The activation energy and enthalpy of the polyimides ranged from 36.6-94.5 kJ/mol and 34.8—92.5 kJ/mol and the moisture absorption in the range of 0.23%-0.75%. 1 Results and Discussion Through the nucleopilic substitution reaction and were polymerized with 1,2-phenylene di (oxy-4,4’-aniline) and 4-aminophenyloxy-N-4- 3,3 ’, 4,4’-benzophenonetetracarboxylic acid dianhydride (BP), 4,4’- hexafluoroisopropylidene diphthalic anhydride (HF), 3,4,9,10-perylenetetracarboxylic acid dianhydride (PD) and pyromellitic dianhydride ) either later one cycle solution polymerization reaction or two step procedure. The later includes ring opening polyaddition to give poly (amic acid), followed by cyclodehydration to polyimides. These polymers had inherent viscosities ranging from 0.61-0.83 dL / gm. Few of the polymers were soluble in most of the organic solvents such as DMSO, DMF, DMAc, NMP and m-Cresol even at room temperature and some were soluble on heating. The degradation temperature of the resulting polymers falls in the ranges from 240-500 ° C in nitrogen (with only 10% weight loss). Specif ic heat capacity at 200 ° C ranges from -4.032 2-2.627 5 Jg-1 · K-1. The maximum degradation temperature ranges from 550-630 ° C. Tg values ​​of the polyimides ranged from 185 to 272 ° C. The activation energy and enthalpy of the polyimides ranged from 36.6-94.5 kJ / mol and 34.8-92.5 kJ / mol and the moisture absorption in the range of 0.23% -0.75%.