Effect of graphene nanoplatelets on coefficient of thermal expansion of polyetherimide composite

Research output: Contribution to journalArticle

  • 14 Citations

Abstract

Thermal expansion is one of the major concerns for polymer composites. In this research, graphene nanoplatelets (GNPs) were added to polyetherimide (PEId) thermoplastic polymer in order to reduce the coefficient of thermal expansion (CTE) of the injection molded composite. First, the coefficient of linear thermal expansion (LTE) was measured in three directions in the anisotropic coupon: 0°, 90°and the out of plane Z direction. It is found that the GNP particles are very effective in terms of reducing the LTE in 0°direction due to high degree of alignment. After annealing above glass transition temperature, significant increase of 0°LTE and decrease of Z°LTE were observed. The bulk CTE was calculated by adding up the LTEs in all three directions and is found to be independent of annealing. Second, several models were applied to predict both CTE and LTE. It is found that Schapery's lower limit model fits the experimental CTE very well. Chow's model was applied for LTEs in three directions. The behavior of GNP-5/PEId composites is explained by the combination of Chow's model and morphology obtained by scanning electron microscope (SEM).

LanguageEnglish (US)
Pages26-36
Number of pages11
JournalMaterials Chemistry and Physics
Volume146
Issue number1-2
DOIs
StatePublished - Jul 15 2014

Profile

Polyetherimides
Graphite
Graphene
Thermal expansion
thermal expansion
graphene
composite materials
Composite materials
coefficients
local thermodynamic equilibrium
Polymers
polyetherimide
Annealing
annealing
polymers
glass transition temperature
Thermoplastics
Electron microscopes
electron microscopes
alignment

Keywords

  • Annealing
  • Composite materials
  • Electron microscopy
  • Thermal expansion

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Effect of graphene nanoplatelets on coefficient of thermal expansion of polyetherimide composite. / Wu, Huang; Drzal, Lawrence T.

In: Materials Chemistry and Physics, Vol. 146, No. 1-2, 15.07.2014, p. 26-36.

Research output: Contribution to journalArticle

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