Melt preparation and investigation of properties of toughened Polyamide 66 with SEBS-g-MA and their nanocomposites

Polyamide 66/SEBS-g-M alloys and their nanocomposites were prepared by melt compounding using a twin screw extruder. The mechanical properties, rheological behavior and morphology of these alloys and their nanocomposites were investigated. Morphological investigations with different methods show pseudo-one-phase type morphology for these prepared alloys at all percentage of rubber. Impact and tensile tests results showed that rubber toughened samples exhibit significantly more impact strength and elongation at break comparing to virgin Polyamide. Samples with 20% of rubber show impact strength about 15 times and elongation at yield several times more than those of virgin Polyamide. So, these rubbers modified polyamide can be consider as super toughened rubber. A general type organoclay at 4% and 8% has been used with rubber toughened samples to tolerate their modulus and tensile strength. Obtained results show that nanoclay could significantly increase modulus and tensile strength of rubber modified Polyamide 66 without considerable effects on impact strength. WAXD and SEM results show that the Polyamide 66 nanocomposites are better exfoliated in presence of SEBS-g-MA. Some investigation on viscosity and melt flow index of PA66 and their alloys show that shear viscosity of PA66 nonlinearly decrease with incorporation of SEBS-g-MA and organoclay into it.