Polymerization of Monomeric Reactants (PMR) type of polyimide was prepared using bis(3,5-dimethyl-4-amino phenyl)-4'-methoxy phenyl methane and characterized by elemental analysis, FT-IR, H-1 NMR, and C-13 NMR spectral techniques. Differential scanning calorimetry (DSC) analysis shows that melting and curing take place in the temperature range of 215 to 230 degrees C and 265 to 315 degrees C respectively. The uncured and cured prepolymer undergo two step (335 and 583 degrees C) and single step (537 degrees C) decomposition respectively. The T-10% and char yield at 800 C were found to be 465 degrees C and 46 wt %, respectively. FT-IR and thermogravimetric analysis (TGA) of the heat treated resin powder and prepolymer reveal that imidization takes place in the temperature range 250-275 degrees C and cross-linking occurs between 275 and 325 degrees C. The prepolymer was found to undergo photocross-linking. The flexural strength, flexural modulus, and interlaminar shear strength of carbon fiber (T300) reinforced BA4MPM-PMR type composite are 447 MPa, 34 GPa, and 42 MPa, respectively.