The friction stir process (FSP) method used to prepare polyamide 6 (PA6)/nitrile-butadiene rubber (NBR) nanocomposites with 1 wt% Graphene nanoparticles. Response surface methodology (RSM) and Box-Behnken design were used to study the effects of four input variables including tool rotational speed (ω), shoulder temperature (T), traverse speed (S), and the number of passes (N) on tensile strength and impact strength of PA6/NBR/Graphene nanocomposite. In order to investigate the dispersion state of Graphene and the morphology of the PA6/NBR blend in the presence of Graphene, wide x-ray patterns (WAX), scanning electron microscopy (SEM) were performed. Furthermore and differential scanning calorimetric (DSC) was used to investigate the thermal properties of PA6/NBR containing 1 wt% Graphene nanoparticles. The results confirmed that at the optimum range of input variables, PA6/NBR/Graphene nanocomposite provided good thermal stability as well as the highest tensile strength, and impact strength. This is caused by the large surface area to volume ratio of the dispersed layered Graphene in PA6/NBR blends. Under optimal conditions of the rotational speed of 1200 rpm, traverse speed of 20 mm/min, shoulder temperature of 125°C, and number pass of 3, the maximum tensile strength and impact strength are 70.4 MPa and 70.3 J/m, respectively.

Polyamide 6/Acrylonitrile butadiene rubber/Perlite nanocomposites with different percentages of NBR phase and perlite nanoparticle were prepared using the melt mixing process. The fracture behavior of PA6/NBR/Perlite nanocomposites was studied by the essential work of fracture method (EWF).Furthermore, response surface methodology (RSM) was employed to evaluate the effect of input variables, namely NBR and perlite content, on fracture behavior and Young's modulus of these nanocomposites. Scanning electron microscopy was used as a method for studying the morphology of the thermoplastic elastomer matrix containing different percentages of NBR elastomer and perlite nanoparticles. The results confirmed that, with controlling input variables, the optimum conditions of the system could be obtained, which leads to an improvement in fracture behavior and modulus strength of PA6/NBR/Perlite nanocomposites. RSM results illustrated that Young's modulus is increased from 2539 to 2862 MPa with an increase in perlite content from 3 to 7 wt%, when NBR content is 20 wt%. Moreover, Elongation at break is increased from 59.8% for 20 wt% NBR elastomer up to 102.8% for 40 wt%.The results of the EWF test illustrated that the samples with 30 and 10 wt%. NBR and 5 wt% perlite, have the maximum values of essential work of fracture (283.8 N/mm) and nonessential work of fracture (22.2 N/mm 2 ), respectively.

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