Falling Weight Impact Strength and Transparency of Rubber-Modified Methylmethacrylate-Butadiene-Styrene Resin/Emulsion Graft Polymer Blends

Abstract

Impact resistance and transparency of methylmethacrylate-butadiene-styrene resin (MBS resin) with a bimodal distribution of rubber particle sizes were investigated. Rubber-modified MBS resin was selected as contributing large rubber particles. Emulsion graft polymer was selected as contributing small rubber particles. The blends were evaluated focusing on falling weight impact strength. The falling weight impact strength was improved by the bimodal distribution, but the tendency was different for Charpy notched impact strength. The transformed rubber particles and voids were observed in the TEM photographs of whitened area, and crazing was not observed. Not only the falling weight impact strength but also transparency was improved by the bimodal distribution.