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• W4321769411 abstract "This paper describes a method to improve the thermal conductivity, mechanical properties and thermal dimensional stability of polyimide-based composites by rationally introducing carbon nanotubes (CNT) chemically-grafted-carbon fiber CF into the polyimide matrix via an ice-templating strategy followed by hot-pressing. The grafted CNT onto CF surface ([email protected]) significantly increased the roughness of the smooth surface of carbon fiber, improving the interfacial compatibility between [email protected] and PI matrix and resulting in improved thermal conductivity and tensile strength as well as the dimensional stability. Typically, the PI/[email protected] composite containing 20 wt% [email protected] exhibits an in-plane thermal conductivity of 4.25 W m−1 K−1, 1134% enhancement compared to the pure matrix (0.34 W m−1 K−1). Meanwhile, the PI/[email protected] composite also presents an increased tensile strength (130 MPa), ∼18 MPa and ∼58 MPa higher than that of PI/CF20 composite (102 MPa) and pure PI (72 MPa), respectively. Besides, the resulting composites exhibit a gradually reduced coefficient of thermal expansion (CTE), which decreases from 66.7 ppm K−1 to 24.7 ppm K−1 as the content of [email protected] increasing from 0 to 20 wt%. Interestingly, the PI/[email protected] composites also show good Joule heating performances at low driving voltages. Accordingly, the developed polyimide-based composites demonstrate high potential as advanced thermal management materials with excellent mechanical properties." @default.
• W4321769411 created "2023-02-25" @default.
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• W4321769411 date "2023-04-01" @default.
• W4321769411 modified "2023-10-18" @default.
• W4321769411 title "Polyimide-based composites reinforced by carbon nanotube-grafted carbon fiber for improved thermal conductivity and mechanical property" @default.
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• W4321769411 doi "https://doi.org/10.1016/j.coco.2023.101543" @default.
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