Abstract
This study describes the impact modification of brittle styrene maleic anhydride (SMA) copolymers with primary amine functionalized ethylene propylene (EP) elastomers. Compatibilization of functional EP in SMA is achieved by chemical reaction of complementary functional groups to form a graft in situ. FTi.r. methods and differential solvent extraction techniques demonstrate graft copolymer formation. Morphological studies indicate that the domain size of the dispersed elastomer ranges from 1 to 3 μm. This may represent an optimum for SMA, which fails by crazing. Rheological characteristics of SMA and SMA/EP blends were studied by using both capillary and parallel-plate viscometers. Graft polymer formation does not substantially increase viscosity at high strain rate, but introduces an apparent yield stress at low shear.
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