Journal
COMPOSITES PART B-ENGINEERING
Volume 188, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2020.107842
Keywords
Polymer-matrix composites (PMCs); Thermoplastic resin; Mechanical properties; Microstructures
Funding
- Office of Naval Research [ONR-BAA13-001, N00014-14-1-0046]
- AMIPP Center in the MSE Department at Rutgers University
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This research demonstrates a general approach to produce graphene enhanced polymer matrix composites (G-PMCs) using in situ shear exfoliation of mined graphite directly within molten thermoplastic polymer. It is found that shear exfoliation of 35 wt % graphite within polyetheretherketone (PEEK) after multipass processing creates graphene nanoflakes (GNFs) that are uniformly distributed and bonded to PEEK, resulting in a nearly 400% increase in tensile modulus. Morphology images show surface crystallization of PEEK on GNF surfaces, very good planar adhesion, and size reduction of GNFs in both the c-axis direction and in diameter due to fracture across the basal plane. Spectroscopic analysis from Raman and XPS spectra indicate in-situ formation of chemical bonding between created GNFs and PEEK. This shear exfoliation melt-mixing method allows high GNF concentration, intimate particle-matrix interaction, in situ functionalization, and provides a platform changing technology for lightweight, stiff PMCs with low raw materials costs, tunable properties, and simple part fabrication methods.
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