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Preparation and characterization of graphite nano-platelet (GNP)/epoxy nano-composite : mechanical, electrical and thermal properties
Publikationstyp
Journal Article
Date Issued
2013-10-19
Sprache
English
TORE-URI
Journal
Volume
49
Issue
12
Start Page
3878
End Page
3888
Citation
European Polymer Journal 12 (49): 3878-3888 (2013)
Publisher DOI
Scopus ID
Publisher
Elsevier
Epoxy based polymer nano-composite was prepared by dispersing graphite nano-platelets (GNPs) using two different techniques: three-roll mill (3RM) and sonication combined with high speed shear mixing (Soni-hsm). The influence of addition of GNPs on the electrical and thermal conductivity, fracture toughness and storage modulus of the nano-composite was investigated. The GNP/epoxy prepared by 3RM technique showed a maximum electrical conductivity of 1.8 × 10-03 S/m for 1.0 wt% which is 3 orders of magnitude higher than those prepared by Soni-hsm. The percentage of increase in thermal conductivity was only 11% for 1.0 wt% and 14% for 2.0 wt% filler loading. Dynamic mechanical analysis results showed 16% increase in storage modulus for 0.5 wt%, although the Tg did not show any significant increase. Single edge notch bending (SENB) fracture toughens (KIC) measurements were carried out for different weight percentage of the filler content. The toughening effect of GNP was most significant at 1.0 wt% loading, where a 43% increase in KIC was observed. Among the two different dispersion techniques, 3RM process gives the optimum dispersion where both electrical and mechanical properties are better.
Subjects
Electrical conductivity
Fractography
Fracture toughness
Graphite nano-platelet/epoxy nano-composite
Thermal conductivity
Three-roll milling technique
DDC Class
540: Chemie
620: Ingenieurwissenschaften