A series of epoxy/polymethyl methacrylate (E/PMMA) blends was synthesized through impregnation polymerization of methyl methacrylate at concentrations ranging (0-1.5 phr) into diglycidyl ether of bisphenol-A (0.1 mol) in presence of 2,2-azobisisobutyronitrile (2 x 10(-2) mol) at 3000 psi, (60-90 +/- 1)degrees C for 3 h in supercritical carbon dioxide, followed by curing of treated epoxy with triethylene tetramine (10 phr) at (40 +/- 1)degrees C. The progress of all such impregnation polymerization reactions was monitored rheo-viscometrically. Formation of E/PMMA blends was ascertained through of PMMA mass uptake (%) into epoxy, UV-vis and FTIR spectra, and TEM. With PMMA mass uptake (%), compression strength and resistance against wear of E/PMMA blends were increased with simultaneous decrease in their Rockwell hardness (R scale), charpy impact, and tensile strength, respectively. All E/PMMA blends have shown nonuniform photoelastic behavior at applied load ranging 4-20 kgf and significant stability against thermooxidation with T-g/T-m and char yield (%) ranging 0.53-0.59, 29.31-31.66, respectively. (c) 2006 Wiley Periodicals, Inc.