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Improved dielectric performance of polypropylene/multiwalled carbon nanotube nanocomposites by solid-phase orientation
Lin, X. Tian, J.-W. Hu, P.-H. Ambardekar, Rohan Thompson, Glen P. Dang, Z.-M. Coates, Philip D.
Lin, X.
Tian, J.-W.
Hu, P.-H.
Ambardekar, Rohan
Thompson, Glen P.
Dang, Z.-M.
Coates, Philip D.
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2016-01-15
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©2016 Wiley. This is the peer-reviewed version of the following article: Lin X, Tian J-W, Hu P-H et al (2016) Improved dielectric performance of polypropylene/multi-walled carbon nanotubes nanocomposites by solid phase orientation. Journal of Applied Polymer Science. 133(3): 42893, which has been published in final form at https://doi.org/10.1002/app.42893. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
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Abstract
By means of die‑drawing technique at rubber‑state, the effect of microstructural orientation on the dielectric properties of polypropylene/multi‑walled carbon nanotubes nanocomposites (PP/MWCNTs) was emphasized in this work. The viscoelastic behavior of PP/MWCNTs with MWCNT loadings from 0.25 to 5 wt% and the dielectric performance of stretched PP/MWCNTs under different drawing speeds and drawing ratios were studied to gain insight into the influence of dispersion and orientation of MWCNTs and matrix molecular chains. A viscosity decrease of approximately 30% in the PP/MWCNTs‑0.25 wt% melt was clearly observed owing to the free‑volume effect. Differential scanning calorimetry (DSC) and wide‑angle X‑ray diffraction (WAXD) were used to detect orientation structures and variations in crystal morphology. Melting plateau regions—indicative of mixed crystallization morphology in stretched samples—were observed in the DSC patterns, replacing the single melting peak seen in unstretched samples. The uniaxial stretching process was found to break conductive MWCNT networks and consequently increase the orientation of both MWCNTs and molecular chains along the tensile direction, leading to improved dielectric performance.
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Lin X, Tian J-W, Hu P-H et al (2016) Improved dielectric performance of polypropylene/multi-walled carbon nanotubes nanocomposites by solid phase orientation. Journal of Applied Polymer Science. 133(3): 42893.
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