Thermal and mechanical properties of isotactic polypropylene/poly(propylene-co-1-hexene) blends

In the binary blends of isotactic polypropylene(iPP), the effects of 1-hexene content and amount of propylene/1-hexene copolymer(PHC) on the thermal and mechanical properties and impact strength of the blends have been studied. The iPP/PHC blends gave a single glass transition temperature corresponding to intermediate of the constituents, however the melting temperature of the blends was almost unchanged. The size of spherulite decreased with PHC content, but did not affect the melting behavior. The addition of PHC decreased the modulus of the blends and increased the impact strength in a great extent.