Effect of processing conditions on the thermal and electrical conductivity of poly (butylene terephthalate) nanocomposites prepared via ring-opening polymerization

Successful preparation of polymer nanocomposites, exploiting graphene-related materials, via melt mixing technology requires precise design, optimization and control of processing. In the present work, the effect of different processing parameters during the preparation of poly (butylene terephthala...

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Bibliographic Details
Published in:arXiv.org 2017-06
Main Authors: Colonna, S, Bernal, M M, Gavoci, G, Gomez, J, Novara, C, Saracco, G, Fina, A
Format: Article
Language:English
Subjects:
Charge transport
Design of experiments
Design optimization
Dispersion
Electrical resistivity
Extrusion rate
Factorial design
Graphene
Molecular weight
Morphology
Nanocomposites
Photoelectrons
Polybutylene terephthalates
Polymerization
Polymers
Process parameters
Raman spectroscopy
Ring opening polymerization
Shear rate
Spectrum analysis
Terephthalate
Thermal conductivity
Thermodynamic properties
Thermogravimetry
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Summary:Successful preparation of polymer nanocomposites, exploiting graphene-related materials, via melt mixing technology requires precise design, optimization and control of processing. In the present work, the effect of different processing parameters during the preparation of poly (butylene terephthalate) nanocomposites, through ring-opening polymerization of cyclic butylene terephthalate in presence of graphite nanoplatelets (GNP), was thoroughly addressed. Processing temperature (240{\deg}C or 260{\deg}C), extrusion time (5 or 10 minutes) and shear rate (50 or 100 rpm) were varied by means of a full factorial design of experiment approach, leading to the preparation of polybutylene terephthalate/GNP nanocomposite in 8 different processing conditions. Morphology and quality of GNP were investigated by means of electron microscopy, X-ray photoelectron spectroscopy, thermogravimetry and Raman spectroscopy. Molecular weight of the polymer matrix in nanocomposites and nanoflake dispersion were experimentally determined as a function of the different processing conditions. The effect of transformation parameters on electrical and thermal properties was studied by means of electrical and thermal conductivity measurement. Heat and charge transport performance evidenced a clear correlation with the dispersion and fragmentation of the GNP nanoflakes; in particular, gentle processing conditions (low shear rate, short mixing time) turned out to be the most favourable condition to obtain high conductivity values.
ISSN:2331-8422
DOI:10.48550/arxiv.1703.00798