Flexible silicone rubber/carbon fiber/nano-diamond composites with enhanced thermal conductivity via reducing the interface thermal resistance

Abstract

Insulating materials with heat dissipation are urgently required for modern electronic devices and systems. In this study, 4,4-methylene diphenyl diisocyanate was used as the coupling agent, and nano-diamond (ND) particles were grafted onto the surface of carbon fibers (CFs) to prepare CF-ND/silicone rubber (SR) composites. The ND acted as a “bridge” among CFs, which can reduce the interface thermal resistance between CFs because the dot-like ND can increase the interfacial area of CFs, making it easier to form heat-conducting networks between SR. When the content of CF-ND (1:6) was 20%, the thermal conductivity of the SR composite was 0.305 W/(m·K), 69% higher than that of pure SR. The ND between CFs can improve the dynamic mechanical properties by acting as a crack pinhole. In addition, the CF-ND/SR composites also exhibited excellent thermal stability. This work has enormous potential for advanced electronic devices.

Silicone Nanocomposites with Enhanced Thermal Resistance: A Review

“…When the CF-ND content (1:6) was 20%, the thermal conductivity of the SR composite was 69% higher than that of pure SR. The CF-ND/SR composites also showed excellent thermal stability [47].…”

“…This nanocomposite was obtained through the hydrosilylation reaction of hydrogen polydimethylsiloxane silicon (H-PDMS) with polyvinyl dimethylsiloxane (vinyl-PDMS), with vinyl-GO used as a nanofiller [46]. Whereas, Wang et al [47] modified carbon fibers (CF) by grafting nanodiamond (ND) particles onto their surface. Then, the nanofillers prepared in this way were used to obtain a CF-ND/silicone rubber (SR) composite.…”

Current state-of-the-art of carbonaceous nanofiller coated carbon fiber in polymeric nanocomposites

“…The material was used to fabricate the light weight, chemically stable, and strengthened micro-electrodes. Wang et al 114 designed the nano-diamond coated carbon fibers and filled into the silicone rubber composites. The nanodiamond represented as bridge between the carbon fiber and matrix.…”

In Situ Construction of High-Thermal-Conductivity and Negative-Permittivity Epoxy/Carbon Fiber@Carbon Composites with a 3D Network by High-Temperature Chemical Vapor Deposition

“…Carbon fiber (CF), as a low-density, high-strength, high-modulus-ratio fibrous material, has good properties such as abrasion resistance, heat resistance, dimensional stability, and chemical resistance. , Currently, carbon fiber has become a reinforcing material with great development potential and broad application prospects. − However, the surface inertness of carbon fiber leads to interfacial effects with the polymer, which affects the thermal and mechanical properties of the composite materials. , The use of surface modification technology can improve the surface activity of carbon fiber, strengthen the interfacial properties between the carbon fiber and the matrix, and improve the bonding effect between the carbon fiber and the matrix, thus increasing the value of carbon fiber materials in industrial applications. Torokhov and others proposed thermal oxidation to surface-modify carbon fibers in order to enhance the interfacial interaction between carbon fibers and the polymer matrix.…”

“…30−32 However, the surface inertness of carbon fiber leads to interfacial effects with the polymer, which affects the thermal and mechanical properties of the composite materials. 33,34 The use of surface modification technology can improve the surface activity of carbon fiber, strengthen the interfacial properties between the carbon fiber and the matrix, and improve the bonding effect between the carbon fiber and the matrix, thus increasing the value of carbon fiber materials in industrial applications. Torokhov 35 and others proposed thermal oxidation to surface-modify carbon fibers in order to enhance the interfacial interaction between carbon fibers and the polymer matrix.…”