Abstracts Book - IMRC 2018

• SB1-P066
EXPERIMENTAL AND COMPUTATIONAL STUDY OF
CONDUCTIVITY OF MULTILAYER GRAPHENE IN POLYPROPYLENE
NANOCOMPOSITES
Roxana Mitzayé del Castillo Vázquez 1 , Luis Felipe del Castillo 2 , Alipio Calles Martinez 1 , Vicente
Compañ 3
1
Facultad de Ciencias, UNAM, Departamento de Física, Mexico. 2 Instituto de Investigaciones en
Materiales, Polímeros, Mexico. 3 Universidad Politécnica de Valencia, Departamento de
Termodinámica Aplicada. Escuela Técnica Superior de Ingenieros Industriales (ETSII), Spain.
We study the electronic properties of compounds formed by graphene and
polypropylene. Our study makes a comparative analysis between experimental
and computational results. To make an experimental measurement of the
electronic properties, we deposited Multilayer Graphene (MLG) nanoparticles
over a polypropylene matrix. The deposition was made in several stages, in
which, we added to the polymer matrix different percentages of MLG
nanoparticles using the melt compounding technique and we studied the
microwave adsorption. The experimental conductivity was measured using
electrochemical spectroscopy impedance equipment. The second part consists
of computational calculations, in which we studied the electronic properties of
a graphene sheet under one polypropylene molecule with different degrees of
polymerization. In both analyses, there is a strong percolation phenomenon
with a percolation threshold around 18% of MLG nanoparticle. Before the
percolation threshold, the charge carriers are constrained in the polypropylene
molecule, making the system an insulating material. After the percolation
threshold, the charge carriers are constrained in the graphene, making the
system a conductor material. The incorporation of the quantum effects and the
percolation phenomenon make possible for the theoretical conductivity to be
close to the experimental conductivity.
Acknowledgment: This research has been supported by the ENE/2015-69203-R
project, granted by the Ministerio de Economía y Competitividad (MINECO),
Spain, Also Authors are grateful to UNAM-DGAPA-PAPIIT projects IG 100315,
DGTIC-UNAM for access to the Miztli- UNAM supercomputer LANCAD-UNAM-
DGTIC-055, and UNAM-DGAPA for the Postdoctoral grant of Roxana M. del
Castillo.
Keywords: Graphene nanoparticles, polypropylene composite, conductivity
Presenting authors email: roxanadelcastillo@ciencias.unam.mx