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Relevance of Rheology on the Properties of PP/MWCNT Nanocomposites Elaborated with Different Irradiation/Mixing Protocols

1
Polymer Science and Technology Department and Polymer Institute POLYMAT, University of the Basque Country (UPV/EHU), Joxe Mari Korta Building, Av. Tolosa 72, 20018 Donostia-San Sebastian, Spain
2
CIDETEC Research Center, Polymers and Composites, Po Miramón 191, 20014 Donostia-San Sebastian, Spain
*
Author to whom correspondence should be addressed.
Received: 3 December 2018 / Revised: 27 December 2018 / Accepted: 4 January 2019 / Published: 9 January 2019
(This article belongs to the Special Issue Advances in Experimental and Computational Rheology)
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Abstract

Linear and nonlinear rheological features and electrical conductivity of two nanocomposite systems based on polypropylene/multiwall carbon nanotubes (PP/MWCNT) are investigated. The nanocomposites were irradiated with an electron beam following two different procedures. Protocol A, where the nanocomposite mixture is irradiated, and Protocol B where only the PP matrix is irradiated before mixing with MWCNT. The same irradiation dose adjusted to bring about long chain branching (LCB) but not crosslinking, is used in both types of nanocomposites. The modification of the polymer matrix viscosity caused by irradiation determines the MWCNT dispersion and therefore the rheological and percolation thresholds. Elongational flow results reveal that strain hardening, typical of irradiated PPs, is observed for the nanocomposites irradiated, but not for the nanocomposites prepared with the irradiated PP. The hypothesis of a shear flow modification that aligns the branches into the backbone, eliminating the strain hardening is considered. View Full-Text
Keywords: nanocomposites; LCB polypropylene; rheology; oscillatory flows; elongational flow nanocomposites; LCB polypropylene; rheology; oscillatory flows; elongational flow
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Fernandez, M.; Huegun, A.; Santamaria, A. Relevance of Rheology on the Properties of PP/MWCNT Nanocomposites Elaborated with Different Irradiation/Mixing Protocols. Fluids 2019, 4, 7.

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