#6874. Structure-function integrated poly (aryl ether ketone)-grafted MWCNTs/poly (ether ether ketone) composites with low percolation threshold of both conductivity and electromagnetic shielding

December 2026publication date
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Journal’s subject area:
Engineering (all);
Ceramics and Composites;
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Abstract:
In this work, a soluble poly (aryl ether ketone) with an azide-group (az-PAEK) was designed and synthesized, and poly (aryl ether ketone) was successfully grafted onto the surface of multi-walled carbon nanotubes (PAEK-g-MWCNTs) by [2 + 1] cycloaddition reaction between azide-group of az-PAEK and similar carbon-carbon double bond (C[dbnd]C) on MWCNTs. In addition, PAEK-g-MWCNTs were dispersed into semi-crystalline poly (ether ether ketone) (PEEK) matrix as fillers, the electrical conductivity, electromagnetic shielding performance, mechanical properties and thermal stability of PAEK-g-MWCNTs/PEEK composites with different filler contents were discussed. The results show that the excellent dispersion effect of PAEK-g-MWCNTs filler in PEEK matrix leads to the percolation threshold of conductivity and electromagnetic shielding of PAEK-g-MWCNTs/PEEK composites are only 0.372 vol% and 0.496 vol% respectively, which endows PAEK-g-MWCNTs/PEEK composites with extraordinary conductivity (1.123 S/cm) and electromagnetic shielding performance (36 GHz, 53.56 dB). At the same time, the mechanical properties (tensile strength of 118.2 MPa) and thermal stability (561 °C) of PAEK-g-MWCNTs/PEEK composite are enhanced, which is a kind of structure-function integrated composite with low percolation threshold of both conductivity and electromagnetic shielding.
Keywords:
az-PAEK; Low percolation threshold; PAEK-g-MWCNTs; PEEK; Structure-function integrated

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