Rheological methods to investigate graphene/amorphous polyamide nanocomposites: Aspect ratio, processing, and crystallization

Nanocomposites obtained by melt mixing commercial graphene in an amorphous polyamide are investigated. No symptoms of percolation are observed, which is attributed to the low aspect ratio (fs = 20) deduced from elastic modulus data. The study of the effect of temperature and pressure on viscosity, c...

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Bibliographic Details
Published in:Polymer engineering and science 2015-05, Vol.55 (5), p.1142-1151
Main Authors: Canales, Jorge, Fernández, Mercedes, Peña, Juan Jose, Eugenia Muñoz, María, Santamaría, Antxon
Format: Article
Language:English
Subjects:
Carbon
Chemical properties
Crystallization
Dynamic tests
Elastic modulus
Extrusion
Graphene
Identification and classification
Melts
Nanocomposites
Polyamide resins
Polyamides
Polymeric composites
Polymers
Pressure
Rheology
Temperature
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Summary:Nanocomposites obtained by melt mixing commercial graphene in an amorphous polyamide are investigated. No symptoms of percolation are observed, which is attributed to the low aspect ratio (fs = 20) deduced from elastic modulus data. The study of the effect of temperature and pressure on viscosity, carried out combining extrusion rheometry and PVT tests, reveals that the nanocomposites can be extruded and injected under similar conditions to pure polyamide. The time evolution of the dynamic viscoelastic functions are analyzed to investigate the crystallization process, observing that it is considerably accelerated in nanocomposites. The results represent a valuable outcome for practical applications. POLYM. ENG. SCI., 55:1142–1151, 2015. © 2014 Society of Plastics Engineers
ISSN:0032-3888
1548-2634
DOI:10.1002/pen.23985