Abstract
The effect of the chemical composition on the morphology and microstructure of poly(ether ether ketone) (PEEK)/reduced graphene oxide (RGO) nanocomposite coatings is analyzed. RGO induced three main morphological features in the nanocomposites: (i) a large-scale co-continuous morphology related to nanosheets whose basal planes were mainly aligned with the coating surface, (ii) a dendritic morphology of PEEK domains, and (iii) irregular domains related to the deposition of PEEK particles wrapped by the nanosheets. The development of these morphological features was influenced by the RGO content, allowing the modification of the surface roughness. RGO also induced changes in the melting and non-isothermal crystallization of the polymeric matrix and promoted transcrystallinity in PEEK that, in turn, was a key factor in the development of the final microstructure. In addition, polymer chain mobility was observed to be hindered at high nanofiller concentrations, increasing the glass transition temperature, and diminishing the recrystallization of the polymeric matrix.
Highlights
Poly(ether ether ketone) (PEEK) is a semicrystalline thermoplastic and polyaromatic linear polymer that combines outstanding mechanical properties with high-temperature stability, and low smoke emission and flammability [1–5]
reduced graphene oxide (RGO) induced three main morphological features in the nanocomposites: (i) a large-scale co-continuous morphology related to nanosheets whose basal planes were mainly aligned with the coating surface, (ii) a dendritic morphology of poly(ether ether ketone) (PEEK) domains, and (iii) irregular domains related to the deposition of PEEK particles wrapped by the nanosheets
In our previous work, interesting morphological features were observed in PEEK/reduced graphene oxide (RGO) nanocomposite coatings obtained by electrophoretic co-deposition of PEEK and graphene oxide (GO) particles followed by a thermal treatment [10]
Summary
Poly(ether ether ketone) (PEEK) is a semicrystalline thermoplastic and polyaromatic linear polymer that combines outstanding mechanical properties with high-temperature stability, and low smoke emission and flammability [1–5]. The effect of the chemical composition on the morphology and microstructure of poly(ether ether ketone) (PEEK)/reduced graphene oxide (RGO) nanocomposite coatings is analyzed.
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