In this study, styrene-(ethylene-co-butylenel-styrene (SEBS) triblock copolymer (Kraton G-1652) was modified with maleic anhydride (MA). The maleated SEBS was used as compatibilizer for the blends of Nylon 6 (PA6) and SEBS. The morphology and impact strength of the blends were measured as functions of concentration and MA graft ratio of maleated SEBS. The compatibility and fracture mechanism of the blends were evaluated from the SEM micrographs of the xylene-etched surfaces and of fractured surfaces. Some of the blends exhibited an impact strength up to about 30 fold greater than neat PA6. The fracture involved both both cavitation and shear yielding. The mechanism of compatibilization of maleated SEBS in the ternary components blends was proposed.
SYNOPSISThe compatibility of blends of polyamide-6/ [styrene-(ethylene-butylene) -styrene] triblock copolymer (SEBS) was enhanced with a compatibilizer, maleated SEBS, whose compositions were varied from 0 to 4 wt % of the blends. The maleated SEBS ( MA-g-SEBS) was synthesized by reacting (grafting) maleic anhydride (MA) with SEBS in the laboratory at various maleic anhydride concentrations ranging from 8 to 13 wt % of the maleated compatibilizer. The effects of graft levels of the reactive MA functional group in the compatibilizer on the effectiveness in compatibilizing the blends were investigated. The morphology and the impact strengths of the compatibilized blends were determined. It was found that, depending on the maleated extents, the compatibilizer influenced significantly the properties of the blends. Although the maleated extents (graft ratios) of the compatibilizer is influential, the concentrations of the compatibilizer in the blends more sensitively affected the mechanical properties of the compatibilized blends. In summary, this study has shown that by increasing the MA contents (within the reported window) in the compatibilizer, the impact toughness could be more dramatically improved. 0 1994 John Wiley & Sons, Inc.
In this study, the morphologies and the mechanical properties of the ternary blend of PA (polyamide)b/SEBS(styrene-[ethylene-butylene]-styrene triblock copolymer)/maleated SEBS were investigated. Maleated SEBS compatibilizers of various maleic anhydride (MA) content were prepared in the laboratory. The compatibilizer significantly influenced the dispersion of the rubber as well as the crystalline form and spherulites of the polyamide. The effects of the compatibilizer on mechanical properties were correlated with the observations of morphology and stress-strain behavior. The toughness of the blends was found to be increased for those undergoing additional yielding during cold drawing. Finally, a compatibilization mechanism of maleated SEBS for the blends was proposed.
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