Abstract
Three kinds of the polybutadiene polymethacrylates (BdPMA), with polybutadiene in the main chain, i.e., butadiene dimethacrylate (BdDMA), butadiene tetramethacrylate (BdTMA) and butadiene hexamethacrylate (BdHMA), were synthesized to obtain an extremely tough polymer. BdPMA was copolymerized with MMA and epoxy dimethacrylate (EpDMA) to form copolymer MMA/BdPMA and terpolymer MMA/EpDMA/BdPMA, and the transverse strength and the impact strength of those copolymers and terpolymers were studied.
The transverse strength and the deflection of the copolymer increased with increases in the concentration of BdPMA. The maximum values were obtained at a BdPMA concentration range of 0.3-0.5 mol%. The impact strength showed the highest value (17-20 KJ/m2) at a BdPMA concentration of 1 mol%.
The deflection of the terpolymer increased with increases in the concentration of BdPMA to 90 vol% of MMA concentration. The impact strength of the terpolymer showed the highest value (about 21 KJ/m2) at the liquid composition of 89.55 vol% MMA, 9.95 vol% EpDMA and 0.5 vol% BdTMA. As a result, extremely tough cured resin was obtained by the addition of BdPMA to MMA/EpDMA resin.
