Mechanical Property Improvement of Short Glassfiber Reinforced Polypropylene Using by a Styrene - Maleic Anhydride Based Additive

Abstract

 Effects of styrene-based additive on the mechanical properties of injection-molded short fiberreinforced polypropylene were investigated. Flexural strength was improved by adding styrene based additive and compatibilizer, and the value was equivalent to maleic anhydride modified polypropylene addition. In addition, changes with time of flexural properties by immersion into hot water of 90℃ were also investigated. Flexural properties of short fiber-reinforced polypropyleneadded maleic anhydride modified polypropylene were reduced with increase of the immersion time, while the properties of added styrene based additive and compatibilizer were not affected by the immersion time. The improvement mechanism of flexural strength could be explained by using the yielding condition due to pull-out of fiber. It was also suggested that the mechanism is different to that of maleic anhydride modified polypropylene addition.