The Compatibilizing Effect of Maleic Anhydride in Ethylene-Vinyl Acetate (EVA)/Ethylene-alpha-Olefin Copolymers Blends

摘要

The compatibilizing effect of maleic anhydride (MA) in the immiscible blends of EVA22 (vinyl acetate content 22%)/ethylene-alpha-olefincopolymers with 1-butene (EtBC) and 1-octene (EtOC)) comonomers was studied.By adding 1,2,and 3 phr of MA in the presence of dicumylperoxide,the morphology,tensile strength at break,and 100 and 300 % modulus of EVA22/EtBC and EVA22/EtOC blends were significantly enhanced.The melting point and crystallization point depression were observed upon the addition of MA.The changes in the beta transition and glass transition temperature of ethylene-alpha-olefin copolymers and ethylene-vinyl acetate copolymers,respectively,indicate that MA plays a role of compatibilizer for these immiscible blends.The TGA thermograms,measured from the blends with MA,show that thermal stability is slightly enhanced with MA,indicating that MA acts as a reinforcing agent either by grafting or crosslinking with other copolymers.