Preparation of Graphene-Perfluoroalkoxy Composite and Thermal and Mechanical Properties

Abstract

Perfluoroalkoxy (PFA) material exhibits perfect corrosion resistance under both acid or alkaline circumstances; thus, steel heat exchangers are being substituted by those made of PFA in high corrosion atmospheres. However, the low thermal conductivity of PFA degrades its heat transfer efficiency. Based on the extremely high heat conductivity of graphene, a novel grapheme-PFA composite was proposed to simultaneously meet the demands of heat transfer and corrosion resistance. Ultrasonic dispersion technology was used to disperse the aggregated graphene in the composite. Graphene-PFA composites with different graphene contents and using different dispersing solvents were prepared with a hot pressing method, and thermal conductivity, abrasion resistance, crystallization and pyrolysis properties were investigated. The thermal conductivity of PFA composites with graphene content of 20 wt % reached 5.017 W (m·k) −1 , which is 21.88 times that of pure PFA. The relationship between the abrasion loss and the friction coefficient of the composites with different graphene contents was obtained. A thermogravimetric analyzer was used to investigate the crystallization and pyrolysis behavior of the composites; correspondingly, the temperature range that composites work in was determined. The heat conduction mechanism was analyzed through the thermal conductivity model of composite materials. The composite material is expected to play an important role in the development of high-performance thermal equipment.

Anisotropic Thermally Conductive Perfluoroalkoxy Composite with Low Dielectric Constant Fabricated by Aligning Boron Nitride Nanosheets via Hot Pressing

“…Figure 5a shows the in-plane ( λ ‖ ) and through-plane ( λ ⊥ ) TCs of pure PFA and the BNNs–PFA composites. The results indicated that pure PFA had a low TC of 0.26 W m −1 K −1 , consistent with the previous study [3]. When the BNNs content exceeded 5 wt %, the λ ‖ was higher than their λ ⊥ .…”

“…Perfluoroalkoxy (PFA), as a high-performance fluoropolymer with superior chemical resistance, high thermal stability and low dielectric constant, has a strong potential in electronic packaging. Unfortunately, pure PFA has a low thermal conductivity (TC) of approximately 0.27 W m −1 K −1 , [3] providing insufficient heat dissipation for effective thermal management. Therefore, improving the TC of PFA while maintaining its low dielectric property has significant implications for its application in electronics and portable devices.…”

Graphene−Perfluoroalkoxy Nanocomposite with High Through-Plane Thermal Conductivity Fabricated by Hot-Pressing

“…Afterwards, the GNs–PFA slurry was dried at 120 °C for 24 h in a vacuum oven to remove the residual ethanol. The obtained GNs–PFA powder was put into a mold and heated at 400 °C for 1 h. The molten GNs–PFA sample was hot-pressed at 380 °C under a pressure of 15 MPa for 15 min, then cooled to room temperature under the ambient pressure to form bulk composites (see Figure S2 for the details of the hot-pressing system) [33]. Finally, the bulk composites (length × width × height: 30 × 30 × 11 mm 3 ) were cut into many thin sheets (30 × 11 × 1 mm 3 ) along the direction perpendicular to the top surface of the bulk composite.…”

Development of Multi-Functional Graphene Polymer Composites Having Electromagnetic Interference Shielding and De-Icing Properties

“…Because of their excellent mechanical strength and good electrical and thermal properties [1][2][3], carbon nanomaterials such as carbon black, carbon nanotubes, and graphene have been intensely investigated with respect to industrial applications in aircraft and vehicles [4][5][6][7][8][9][10]. Among these materials, graphene is often used as a filler in composites to improve both electromagnetic interference (EMI) shielding and the mechanical, electrical, and thermal properties.…”