Modeling and optimization of mechanical properties of PA6/NBR nanocomposite reinforced with perlite nanoparticle
In this paper, nanocomposites based on polyamide 6 (PA6)/acrylonitrile-butadiene rubber (NBR)/Perlite were prepared by melt mixing technique in an internal mixer. Response surface methodology (RSM) and central composite design (CCD) were used to study the influence of two material variables including perlite content and NBR content on tensile strength and impact strength of PA6/NBR/Perlite nanocomposites. The microstructure of nanocomposites samples was also examined to confirm the result obtained by scanning electron microscopy images. Based on the results obtained from the response surface methodology, when NBR phase content is 20%wt., with increasing perlite nanoparticles from 3% to 7% wt., the value of tensile strength increased by 12.9% and on the other hand, the value of impact strength decreased by 47.7%. Under optimal conditions of perlite content of 4.37 wt. and NBR content of 34.83 wt., the simultaneous maximization of the tensile strength (58.4 MPa) and impact strength (66.3 J/m) could be obtained. Observations of scanning electron microscopy images showed that the difference in mechanical results was due to the different sizes of the elastomeric phase in different compounds.
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