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Abstract
There is growing interest in carbon fibre fabric reinforced polymer (CFRP) composites based on a thermoplastic matrix, which is easy to rapidly produce, repair or recycle. To expand the applications of thermoplastic CFRP composites, we propose a process for fabricating conductive CFRP composites with improved electrical and thermal conductivities using an in-situ polymerizable and thermoplastic cyclic butylene terephthalate oligomer matrix, which can induce good impregnation of carbon fibres and a high dispersion of nanocarbon fillers. Under optimal processing conditions, the surface resistivity below the order of 10+10 Ω/sq, which can enable electrostatic powder painting application for automotive outer panels, can be induced with a low nanofiller content of 1 wt%. Furthermore, CFRP composites containing 20 wt% graphene nanoplatelets (GNPs) were found to exhibit an excellent thermal conductivity of 13.7 W/m·K. Incorporating multi-walled carbon nanotubes into CFRP composites is more advantageous for improving electrical conductivity, whereas incorporating GNPs is more beneficial for enhancing thermal conductivity. It is possible to fabricate the developed thermoplastic CFRP composites within 2 min. The proposed composites have sufficient potential for use in automotive outer panels, engine blocks and other mechanical components that require conductive characteristics.
Highlights
Composites[7,8,9]
Despite the variations in the filler composition of multi-walled carbon nanotubes (MWCNTs) and graphene nanoplatelets (GNPs), as shown in the active thermography images displayed in Fig. 3a–g and Fig. S3a–f, pores larger than the system’s limiting resolution of 6 μm were not observed[19]
The GNP filler is considered suitable for improving the thermal conductivity of the composites in contrast to the MWCNT filler
Summary
Composites[7,8,9]. Among the various macrocyclic oligomers, CBT oligomers are promising because of their low viscosity, good mechanical properties and usefulness in various applications[8]. CFRP composites, which are based on low-viscosity macrocyclic oligomers, show excellent mechanical properties; their applications are limited because of their limited electrical and thermal conductivities. Repairable, and recyclable CFRP composites with excellent conductivities, as shown, this paper proposes a new fabrication process for composites, which is based on powder mixing and in-situ polymerization of CBT oligomers. This process allows for a high content of fillers and their excellent dispersion, while allowing for a good impregnation of CF fabrics with the thermoplastic resin. Simultaneous improvements in the mechanical and conductive properties of the three-component composites were investigated and discussed
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