Dielectric Spectroscopy of PP/MWCNT Nanocomposites: Relationship with Crystalline Structure and Injection Molding Condition

Nanomaterials

Luigi Torre¹  Alberto Frache²  Ilaria Armentano³  Marco Monti⁴  Marta Zaccone⁴ 

[1] Civil and Environmental Engineering Department, University of Perugia, Strada di Pentima 4, 05100 Terni, Italy;Department of Applied Science and Technology, Polytechnic of Turin, INSTM Research Unit, Viale Teresa Michel 5, 15121 Alessandria, Italy;Department of Economics, Engineering, Society and Business Organization (DEIM), Tuscia University, Largo dell’Università snc, 01100 Viterbo, Italy;Proplast, Via Roberto di Ferro 86, 15122 Alessandria, Italy;

关键词: carbon nanotubes;    polymer nanocomposites;    dielectric properties;    crystallinity;   

DOI  :  10.3390/nano11020550

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown