Anisotropic thermal and electrical conductivities of individual polyacrylonitrile-based carbon fibers

Ji, Xiaoyang; Matsuo, S.; Sottos, Nancy R.; Cahill, David G.

doi:10.1016/j.carbon.2022.06.005

Cited by 21 publications

(8 citation statements)

References 40 publications

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“…The degree of anisotropy in individual CFs is usually a consequence of fiber‐processing parameters, such as temperature of heat treatment prior to carbonization, and speed of fiber drawing. [ 33–35 ] This anisotropic conductivity is also observed in both unidirectional tows and unidirectional CF composites. In industry, CFs are often used in the form of composites instead of bare CF tows.…”

Section: Introductionmentioning

confidence: 73%

Joule Heating of Carbon Fibers and Their Composites in Radio‐Frequency Fields

et al. 2023

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Section: Introductionmentioning

confidence: 73%

Joule Heating of Carbon Fibers and Their Composites in Radio‐Frequency Fields

et al. 2023

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“…As shown in Figure 5 b, axial electrical conductivity (σ ‖ ) is higher than σ ⊥ , the σ ‖ of CF-0, CF-8 and CF@CNTs (the content of CNTs is 0.64 mg/cm 3 ) are 6.2 S/m, 7.7 S/m and 9.4 S/m, respectively, showing increase trend. The main reason is that σ ‖ is not restricted by (CNT/Fe 3 O 4 )/EP, CFs core sheath and interlamination contact resistance, and CFs have high axial electrical conductivity (about 670 S/cm) [ 62 ]. The σ ‖ of CF-8 is higher than CF-0 because CNTs is contained in the filler, and the CNTs direction is along the CFs axial direction, which helps to improve the axial electrical conductivity of EP and composite.…”

Section: Resultsmentioning

confidence: 99%

Two-Steps Method to Prepare Multilayer Sandwich Structure Carbon Fiber Composite with Thermal and Electrical Anisotropy and Electromagnetic Interference Shielding

Zhang

Shi

et al. 2023

Materials

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Carbon fiber (CF) composites performance enhancement is a research hotspot at present. In this work, first, a sandwich structure composite, CF@(carbon nanotube/Fe3O4)/epoxy (CF@(CNT/Fe3O4)/EP), is prepared by the free arc dispersion-CFs surface spraying-rolling process method, herein, CFs in the middle layer and (CNT/Fe3O4)/EP as top and substrate layer. Then, CF@(CNT/Fe3O4)/EP (on both sides) and CFs (in the middle) are overlapped by structure design, forming a multilayer CF@(CNT/Fe3O4)/EP-CFs composite with a CFs core sheath. A small amount of CNT/Fe3O4 is consumed, (CNT/Fe3O4)/EP and CFs core sheath realize thermal and electrical anisotropy and directional enhancement, and multilayer sandwich structure makes the electromagnetic interference (EMI) shielding performance better strengthened by multiple absorption–reflection/penetration–reabsorption. From CF-0 to CF-8, CNT/Fe3O4 content only increases by 0.045 wt%, axial thermal conductivity (λ‖) increases from 0.59 W/(m·K) to 1.1 W/(m·K), growth rate is 86%, radial thermal conductivity (λ⊥) only increases by 0.05 W/(m·K), the maximum λ‖/λ⊥ is 2.9, axial electrical conductivity (σ‖) increases from 6.2 S/cm to 7.7 S/cm, growth rate is 24%, radial electrical conductivity (σ⊥) only increases by 0.7 × 10−4 S/cm, the total EMI shielding effectiveness (EMI SET) increases by 196%, from 10.3 dB to 30.5 dB. This provides a new idea for enhancing CFs composite properties.

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“…%, respectively. It is well-known that carbon fibers intensively conduct heat [ 68 ], so increasing the amount of carbon fibers explains the corresponding rise in thermal conductivity. Moreover, when the investigated value was studied in the direction perpendicular to the layers of reinforced material, heat flowed through the interlayers of the polymer matrix that did not have properly impregnated carbon fibers ( Figure 14 ).…”

Section: Resultsmentioning

confidence: 99%

Mechanical and Thermophysical Properties of Carbon Fiber-Reinforced Polyethersulfone

et al. 2022

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In this study, the mechanical and thermophysical properties of carbon fiber-reinforced polyethersulfone are investigated. To enhance the interfacial interaction between carbon fibers and the polymer matrix, the surface modification of carbon fibers by thermal oxidation is conducted. By means of AFM and X-ray spectroscopy, it is determined that surface modification changes the morphology and chemical composition of carbon fibers. It is shown that surface modification dramatically increases the mechanical properties of the composites. Thus, flexural strength and the E-modulus of the composites reinforced with modified fibers reached approximately 962 MPa and 60 GPa, respectively, compared with approximately 600 MPa and 50 GPa for the composites reinforced with the initial ones. The heat deflection temperatures of the composites reinforced with the initial and modified fibers were measured. It is shown that composites reinforced with modified fibers lose their stability at temperatures of about 211 °C, which correlates with the glass transition temperature of the PES matrix. The thermal conductivity of the composites with different fiber content is investigated in two directions: in-plane and transverse to layers of carbon fibers. The obtained composites had a relatively high realization of the thermal conductive properties of carbon fibers, up to 55–60%.

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Anisotropic thermal and electrical conductivities of individual polyacrylonitrile-based carbon fibers

Cited by 21 publications

References 40 publications

Joule Heating of Carbon Fibers and Their Composites in Radio‐Frequency Fields

Joule Heating of Carbon Fibers and Their Composites in Radio‐Frequency Fields

Two-Steps Method to Prepare Multilayer Sandwich Structure Carbon Fiber Composite with Thermal and Electrical Anisotropy and Electromagnetic Interference Shielding

Mechanical and Thermophysical Properties of Carbon Fiber-Reinforced Polyethersulfone

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