Effect of Multi-Walled Carbon Nanotubes on Viscoelastic Properties of PP/Reed Flour Composites

Published Date
Original Paper

First Online: 

10 December 2016

DOI: 10.1007/s10924-016-0909-x

Cite this article as: 

Kord, B., Jamshidi, M. & Hosseinihashemi, S.K. J Polym Environ (2016). doi:10.1007/s10924-016-0909-x

Author

• Behzad KordEmail author
• Maryam Jamshidi
• Seyyed Khalil Hosseinihashemi

Abstract

The objective of this investigation was to evaluate the influence of multi-wall carbon nanotubes (MWCNTs) on the dynamic mechanical properties of polypropylene (PP)/reed flour (RF) composites. The experimental samples were prepared through the melt mixing of PP/RF at 50% weight ratios, with various amounts of MWCNTs (0, 1, 2, 3 and 5 phr) in a twin-screw extruder, then the samples made by injection molding. The amount of maleic anhydride grafted polypropylene (PP-g-MA) as a coupling agent was fixed at 2 phr for all formulations. Dynamic mechanical analysis (DMA) tests were carried out to investigate the viscoelastic behavior of nanocomposites. The dynamic mechanical properties such as storage modulus (Eʹ), loss modulus (Eʺ), and damping coefficient (tan δ) of nanocomposites were investigated in the temperature range of −80 to 160 °C at a step of 5 °C and frequency of 1 Hz. The morphology of the specimens was characterized using field emission scanning electron microscope (FE-SEM) technique. Results indicated that the storage modulus of samples was found to increase with incorporation of MWCNTs while damping properties registered a decrease, owing to the reinforcing effect of CNTs into the composites. Moreover, CNTs addition leads to a positive shift in glass transition temperature (Tg), which is explained on the molecular mobility of the polymer chains behavior. Additionally, the minimum adhesion factor is related to samples containing 2 phr MWCNTs which provides the best interaction between polymer and fibers. FE-SEM micrographs showed a predominantly homogeneous CNTs distribution through the composites; however, some aggregates were observed at higher CNTs fractions.

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