Role of the solvent in determining morphological hence mechanical properties of double wall carbon nanotubes (DWNT) polyvinylalcohol (PVA) composites were studied using differential scanning calorimetry (DSC), thermal gravimetric analysis (TGA), differential thermal gravimetric analysis (DTGA), dynamic thermal analysis (DMTA), and tensile testing (TT). H₂O (water), DMSO (dimethylsulfoxide), and NMP (N-methylpyrrolidone) were used as solvent for solution based composite formation. Increase in crystallinity of solution based composites and reduction in crystallinity of melt processed composite was observed than their respective polymer only samples. The composites prepared with water as solvent showed maximum reinforcement indicating stress transfer and the one with DMSO exhibited intermediate reinforcement due to entrapment of solvent in matrix It was found in the recrystallization that DMSO samples were more crystalline than water and NMP samples. NMP composites showed reduction in mechanical prosperities than their respective polymer only samples suggesting that there was no stress transferred because of NMP entrapment at DWNT-PVA interface. Entrapment of NMP at PVA-CNT interface is consistent with all the data.

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1. New Method For The Purification Of Carbon Nanotubes and Preparation Of Polymer-Nanotube Composites