Experimental and Statistical Study of Nonlinear Effect of Carbon Nanotube on Mechanical Properties of Polypropylene Composites

In this study concept of experimental design is successfully applied for the determination of optimum condition to produce PP/SWCNT (Polypropylene/Single wall carbon nanotube) nanocomposite. Central composite design as one of experimental design techniques is employed for the optimization and statistical determination of the significant factors influencing on the tensile modulus and yield stress as mechanical properties of this nanocomposite. The significant factors are SWCNT weight fraction and acid treatment time for functionalizing the nanoparticles. Optimum conditions are in 0.7 % of SWCNT weight fraction and 210 min as acid treatment time for 1112.75 ± 28 MPa as maximum tensile modulus and in 216 min and 0.65 % as acid treatment time and SWCNT weight fraction respectively for 40.26 ± 0.3 MPa as maximum yield stress. Also after setting new experiments for test these optimum conditions, found excelent agreement with predicted values. Keywords—Polypropylene, carbon nanotube, nanocomposites, Central composite design