2021 Volume 57 Issue 2 Pages 58-64
Influences of injection temperature on mechanical properties of linear low-density polyethylene（ LLDPE） / polyamide 6（ PA6） blends which were model blends of multilayer films were investigated. When the injection temperature was 170 ℃, shape and size of PA6 particles of dumbbell were almost same with that of strand before injection molding. However, when the injection temperature was higher than 190 ℃, the shape and size of PA6 particles significantly changed with the injection temperature. On the other hand, the mechanical properties（ modulus, tensile yield stress and impact strength） slightly changed with the injection temperature. Incorporation of maleic anhydride grafted polypropylene（ MPP） significantly minimized PA 6 particles in the blends. The incorporation of MPP significantly increased impact strength and slightly changed the modulus and tensile yield stress. At the LLDPE / PA6 / MPP ternary blends, change of the mechanical properties with the injection temperature was smaller than at the LLDPE / PA6 binary blends. In this way, the incorporation of MPP contributed to improvement and good stability of the mechanical properties.
