IMPROVED INTERACTION EFFECTED BY MALEIC ANHYDRIDE-GRAFTED POLYPROPYLENE IN PRP TRIBLOCK POLYMER EVA BLEND

The role of anhydride-grafted polypropylene in the ethylene-propylene triblock polymer and ethylene-vinyl acetate copolymer blend has been s tudied. Maleic anhydride grafted onto polypropylene interacts with pol ymer components in the blend and also improves the dispersion of the r ubber phase in the plastic matrix. Improved interaction is reflected i n the ultimate properties of the blend. Blends with good impact resist ance and low-temperature brittleness may be obtained by optimizing the modifier concentration. Composition with good low-temperature brittle ness is achieved by lowering the glass transition temperature of the p lastic phase by adding a low concentration of modifier. Impact strengt h of the studied blend does not depend only on the reactive maleic anh ydride content but also on the type of modifier. Generally, an increas e in interfacial surface area improves impact strength.