The article describes the effect of incorporating low mol fractions of N-o-tolylmaleimide (MO)/N-p-tolylmaleimide (MP) in poly(methyl methacrylate) (PMMA) on T-g, thermal behavior, mechanical, and optical properties. The glass transition temperature (T-g) of PMMA increased by 10-12 degrees C upon incorporation of an similar to 0.026 mol fraction of N-arylmaleimides. maleimides. A further increase of N-arylmaleimide content up to 0.1 mol fraction in the copolymers resulted in a further similar to 10 degrees C increase in T-g. The tensile strength and % elongation decreased, whereas modulus increased with increasing maleimide content. The solar transmittance and % transmittance at higher wavelengths of the copolymer sheets having a low mol fraction of N-arylmaleimides (i.e., 0.026-0.05) were comparable to PMMA.