From the optimal blend result of our previous study of the addition of 50% of epoxidized corn oil (ECO) into epoxy (EP) resin, which is abbreviated as EPECO, the two materials were manually mixed with a 5:4 ratio of MTHA as a hardener on a molding plate and cured in a curing oven for 120°C for 10 h. Using a high-speed waring laboratory blender set at a 3-minute timer, the cured resin blend was pulverized until it was totally refined. Using a 1:2 solvent ratio of maleic anhydride and acetone prepared in 100 mL, EPECO powder (5% (w/v) of the total volume) was dissolved using overhead stirring set at room temperature. The solution was set aside for the next procedure (Figure ).