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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.
Publication Date
2016-01-15
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(c) 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, effect of the orientation of
microstructure on dielectric properties of polypropylene/multi-walled carbon nanotubes
nanocomposites (PP/MWCNTs) was emphasized in this work. Viscoelasticity behavior of
PP/MWCNTs with MWCNTs weight loadings from 0.25 to 5 wt% and dielectric performance of the
stretched PP/MWCNTs under different drawing speeds and drawing ratios were studied for seeking
an insight of the influences of dispersion and orientation state of MWCNTs and matrix molecular
chains. A viscosity decrease (ca. 30%) of the PP/MWCNTs-0.25wt% melt was obviously observed
owing to the free volume effect. Differential scanning calorimetry (DSC) and wide angle X-ray
diffraction (WAXD) were adopted to detect the orientation structure and the variation of crystal
morphology of PP/MWCNTs. Melting plateau regions, which indicated the mixed crystallization
morphology for the stretched samples, were found in the DSC patterns instead of a single-peak for
the unstretched samples. It was found that the uniaxial stretching process broke the conductive MWCNTs networks and consequently increased the orientation of MWCNTs as well as molecular
chains along the tensile force direction, leading to an improvement of the dielectric performance.
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Citation
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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