Acrylated epoxidized soybean oil (AESO) with different degree of acrylation (50-70 mol%) were produced by acrylation reaction between epoxidized soybean oil (ESO) and acrylic acid. These AESOs were copolymerized with methyl methacrylate (MMA) monomer by free radical polymerization to produce bio-based copolymers (AESO-co-PMMA). Effect of degree of acrylation on tensile properties and thermal properties of the copolymers were investigated. The tensile strength increased with increasing degree of acrylation whereas the elongation at break decreased. The glass transition temperature (Tg) was determined by using dynamic mechanical thermal analysis. Higher degree of acrylation provided higher Tg and crosslink density because of higher reactive double bonds arising from acrylate group. Bioplastic nanocomposite was prepared from AESO-co-PMMA blended with 0.1-0.2 wt% nano-titanium dioxide, the commercial grade, dispersed in ethyl acetate. Its particle size was 2-5 nm. TiO2 increased the tensile strength and decreased the elongation at break of the copolymer. The addition of TiO2 did not significantly affect on Tg and thermal stability of the copolymer.