Compatibility Evaluation of iPP/ABS Blends Based on Shear Creep Recovery Test
The characterization of compatibility is the key research content of polymer blending modification.The commonly used rheological characterization methods are mainly based on dynamic frequency scanning tests,while the tests in the low frequency region usually take long experimental time.Isotactic polypropylene(iPP)/acrylonitrile-butadiene-styrene graft copolymer(ABS)blends were investigated.The shear creep recovery mode of rotary rheometer was utilized to evaluate the compatibility of polymer blends.The obtained conclusions were further verified by using scanning electron microscopy.The results show that for incompatible iPP/ABS blends with different phase morphology,creep recoverable compliance(Jr)exhibits different phenomena.The blends with co-continuous morphology show the highest creep recoverable compliance,while the Jr values of the blends with sea-island morphology are between those of the blends with co-continuous morphology and the pure components.When maleic anhydride grafted polypropylene(PP-g-MAH)and styrene-ethylene-butylene-styrene block copolymer(SEBS)were selected as compatibilizers,respectively,the Jr values of the compatibilized iPP/ABS blends are significantly lower than those of the pure components.This test is relatively short in time and could replace the common characterization methods to quickly evaluate the compatibility of polymer blends.
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