Dielectric Spectroscopy of PP/MWCNT Nanocomposites: Relationship with Crystalline Structure and Injection Molding Condition
In this paper, we study the correlation between the dielectric behavior of polypropylene/multi-walled carbon nanotube (PP/MWCNT) nanocomposites and the morphology with regard to the crystalline structure, nanofiller dispersion and injection molding conditions. As a result, in the range of the percol...
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doaj-b01dda0256814276a66c3235fcc4101c2021-02-23T00:02:53ZengMDPI AGNanomaterials2079-49912021-02-011155055010.3390/nano11020550Dielectric Spectroscopy of PP/MWCNT Nanocomposites: Relationship with Crystalline Structure and Injection Molding ConditionMarco Monti0Marta Zaccone1Alberto Frache2Luigi Torre3Ilaria Armentano4Proplast, Via Roberto di Ferro 86, 15122 Alessandria, ItalyProplast, Via Roberto di Ferro 86, 15122 Alessandria, ItalyDepartment of Applied Science and Technology, Polytechnic of Turin, INSTM Research Unit, Viale Teresa Michel 5, 15121 Alessandria, ItalyCivil and Environmental Engineering Department, University of Perugia, Strada di Pentima 4, 05100 Terni, ItalyDepartment of Economics, Engineering, Society and Business Organization (DEIM), Tuscia University, Largo dell’Università snc, 01100 Viterbo, ItalyIn this paper, we study the correlation between the dielectric behavior of polypropylene/multi-walled carbon nanotube (PP/MWCNT) nanocomposites and the morphology with regard to the crystalline structure, nanofiller dispersion and injection molding conditions. As a result, in the range of the percolation threshold the dielectric behavior shifts to a more frequency-independent behavior, as the mold temperature increases. Moreover, the position further from the gate appears as the most conductive. This effect has been associated to a modification of the morphology of the MWCNT clusters induced by both the flow of the molten polymer during the processing phase and the variation of the crystalline structure, which is increasingly constituted by γ-phase as the mold temperature increases. The obtained results allow one to understand the effect of tuning the processing condition in the frequency-dependent electrical behavior of PP/MWCNT injection-molded nanocomposites, which can be successfully exploited for an advanced process/product design.https://www.mdpi.com/2079-4991/11/2/550carbon nanotubespolymer nanocompositesdielectric propertiescrystallinity |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Marco Monti Marta Zaccone Alberto Frache Luigi Torre Ilaria Armentano |
spellingShingle |
Marco Monti Marta Zaccone Alberto Frache Luigi Torre Ilaria Armentano Dielectric Spectroscopy of PP/MWCNT Nanocomposites: Relationship with Crystalline Structure and Injection Molding Condition Nanomaterials carbon nanotubes polymer nanocomposites dielectric properties crystallinity |
author_facet |
Marco Monti Marta Zaccone Alberto Frache Luigi Torre Ilaria Armentano |
author_sort |
Marco Monti |
title |
Dielectric Spectroscopy of PP/MWCNT Nanocomposites: Relationship with Crystalline Structure and Injection Molding Condition |
title_short |
Dielectric Spectroscopy of PP/MWCNT Nanocomposites: Relationship with Crystalline Structure and Injection Molding Condition |
title_full |
Dielectric Spectroscopy of PP/MWCNT Nanocomposites: Relationship with Crystalline Structure and Injection Molding Condition |
title_fullStr |
Dielectric Spectroscopy of PP/MWCNT Nanocomposites: Relationship with Crystalline Structure and Injection Molding Condition |
title_full_unstemmed |
Dielectric Spectroscopy of PP/MWCNT Nanocomposites: Relationship with Crystalline Structure and Injection Molding Condition |
title_sort |
dielectric spectroscopy of pp/mwcnt nanocomposites: relationship with crystalline structure and injection molding condition |
publisher |
MDPI AG |
series |
Nanomaterials |
issn |
2079-4991 |
publishDate |
2021-02-01 |
description |
In this paper, we study the correlation between the dielectric behavior of polypropylene/multi-walled carbon nanotube (PP/MWCNT) nanocomposites and the morphology with regard to the crystalline structure, nanofiller dispersion and injection molding conditions. As a result, in the range of the percolation threshold the dielectric behavior shifts to a more frequency-independent behavior, as the mold temperature increases. Moreover, the position further from the gate appears as the most conductive. This effect has been associated to a modification of the morphology of the MWCNT clusters induced by both the flow of the molten polymer during the processing phase and the variation of the crystalline structure, which is increasingly constituted by γ-phase as the mold temperature increases. The obtained results allow one to understand the effect of tuning the processing condition in the frequency-dependent electrical behavior of PP/MWCNT injection-molded nanocomposites, which can be successfully exploited for an advanced process/product design. |
topic |
carbon nanotubes polymer nanocomposites dielectric properties crystallinity |
url |
https://www.mdpi.com/2079-4991/11/2/550 |
work_keys_str_mv |
AT marcomonti dielectricspectroscopyofppmwcntnanocompositesrelationshipwithcrystallinestructureandinjectionmoldingcondition AT martazaccone dielectricspectroscopyofppmwcntnanocompositesrelationshipwithcrystallinestructureandinjectionmoldingcondition AT albertofrache dielectricspectroscopyofppmwcntnanocompositesrelationshipwithcrystallinestructureandinjectionmoldingcondition AT luigitorre dielectricspectroscopyofppmwcntnanocompositesrelationshipwithcrystallinestructureandinjectionmoldingcondition AT ilariaarmentano dielectricspectroscopyofppmwcntnanocompositesrelationshipwithcrystallinestructureandinjectionmoldingcondition |
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1724255407557312512 |