To enhance interfacial properties of carbon fiber/epoxy composites, a facile and effective process was developed to fabricate three-dimensional interconnected nanosheet architecture by in situ growing Ni(OH)2 nanosheets on carbon fibers (CFs). Scanning electron microcopy clearly revealed that the nanostructured Ni(OH)2 nanosheets were uniformly grown on carbon fibers, which could play as nanocontainers of the epoxy matrix when fracture occurred. To explore the mechanical interlocking of composites, energy-dispersive spectrometry mapping scanning was performed to explore the penetration transition layer. The interfacial shear strength improved up to 82.1% compared with untreated composites, and the optimal interlaminar shear strength of composites reached up to 93.9 MPa. According to the test results, it is reasonable to consider that this new effective and low-cost strategy could effectively improve the interfacial properties of CF/epoxy composites and could be a good candidate for potential large-scale industrial application.
The working temperature of electronic components directly determines their service life and stability. In order to ensure normal operation of electronic components, cooling the coating is one of the best ways to solve the problem. Based on an acrylic amino-resin system, a dissipating coating was prepared with carbon fiber (CF) as the main thermal conductive filler. The influence of the CF content on the thermal conductivity was determined by the single factor method. The surface structure was observed by scanning electron microscopy (SEM). The results show: With the increase of the CF mass fraction, both the heat dispersion and heat conduction coefficient of the coating tend to increase at first and then decrease, and the heat dissipation effect is optimum when the CF mass fraction is 12.3 wt %. At this point, the coating shows an excellent comprehensive performance, such as 1st level adhesion, H grade hardness, and thermal conductivity of 1.61 W/m•K. Furthermore, this paper explored the radiating mechanism of coating in which CF produces a coating which forms a heat "channel" for rapid heat conduction. When the optimal value is exceeded, the cooling effect is reduced because of the accumulation and the anisotropy of CF.
Phenolic resin/carbon fiber (PF/CF) composites have good tribological properties; however, their extensive applications are limited because of the poor thermal conductivity of the phenolic resins. In this work, core‑shell particles of polyaniline‐coated (3‐aminopropyl) triethoxysilane‐modified β‐Si3N4 (m‐SiN@PANI) were used to enhance the tribological, electrical, and thermal conductivity properties of a PF/CF composite. A core‑shell particle, consisting of m‐SiN@PANI, was characterized by Fourier Transform Infrared Spectrometry, X‐Ray Diffraction, Scanning Electron Microscope, and Transmission Electron Microscope. The friction, thermal, and electrical properties of the composites were characterized by multifunctional vertical friction testing, wear measurement testing, thermogravimetric analysis, thermal constant analysis, and electrical conductivity testing. Remarkably, the test results showed that compared with the wear surface of the PF/CF composite, that of the phenolic resin/(2.0 wt % m‐SiN@PANI)/carbon fiber composite exhibited a smoother morphology. The results indicated that the addition of m‐SiN@PANI effectively improved the thermal conductivity, electrical conductivity, friction coefficient, and wear rate of the composites, which were 3.164 Wm−1 K−1, 5.33 × 10−6 S/m, 0.1681 and 1.13 × 10−8 mm3/Nm, respectively. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47785.
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