To expand the application of light-weight and high-strength polymer matrix composites in the fields of aerospace, shipbuilding and transportation, it has designed and fabricated a new-type carbon fiber fabric/hollow glass beads/ epoxy resin (CFF/HGB/EP) composite with a three-layer sandwich structure, consisting of an upper composite layer (CFF/EP), core layer (HGB/EP) and lower composite layer (CFF/EP). The effects of the CFF/EP layer and the HGB content on the sandwich composites were explored through a systematic investigation of the mechanical properties and microstructure. The results indicate that the density of the sandwich composite can be reduced to 0.83 g cm À3 , while the flexural, impact, and tensile strength of the sandwich composite can be increased by 227%, 156%, and 118% compared with pure epoxy resin, respectively. The great improvement of mechanical properties of the sandwich composite makes its application in various industries more promising.
Incorporation of 2D nanofillers can effectively improve tribological performance of epoxy resin (EP). In this work, two types of 2D nanosheets are incorporated to maximize the tribological performance of EP nanocomposites. On the one hand, nano tungsten disulfide (WS 2 ) was coated on graphene oxide (GO) to form 2D WS 2 @GO nanosheets before they were incorporated into EP matrix. On the other hand, as a comparison, WS 2 -GO hybrid was incorporated into EP matrix by directly mixing to obtain epoxy nanocomposites. Tribological performance of EP composites with 0.1-5 wt% 2D WS 2 @GO nanosheets and WS 2 -GO hybrid are then systematically investigated. It is interestingly observed that the addition of WS 2 -GO hybrid at 1 wt% decreases the friction coefficient by 5.4% and the specific wear rate by 67.7% of neat EP; comparatively, adding the 2D WS 2 @GO nanosheets at 1 wt% presents much higher improvements in reducing the friction coefficient by 24.1% and the specific wear rate by about 96.3% of EP. The formation of transfer film is shown to be responsible for enhancing tribological properties of EP by the hybridization of 2D nano-WS 2 and GO nanosheets. Consequently, it is clear that forming 2D WS 2 @GO nanosheets is dramatically superior to simply mixing nano WS 2 and GO with EP in enhancing tribological performance.
The brittleness of epoxy resin (EP) and the smooth, inert surface of carbon fiber (CF) affects their interfacial interaction, making the composite exhibit poor interlaminar shear properties that significantly limit its practical application. In this paper, a 4,4‐diphenylmethane diisocyanate (MDI) layer was uniformly coated on short‐cut carbon fiber (SCF) by chemical bonding and physical cladding. The reaction of the isocyanate group of MDI with the active hydrogen in the epoxy system was used to form a strong chemical bond between EP and SCF to enhance the interfacial interaction. Moreover, the introduced SCF as filler can play a better connecting and anchoring role in the CF/EP composite, enabling better stress transfer and enhancing the integrity inside the composite. The coating of MDI on the surface of SCF and the efficient synergistic effect that it brings were successfully demonstrated by Fourier‐transform infrared, thermogravimetric analyzer, dynamic mechanics analyzer, scanning electron microscopy, and interlaminar shear strength characterization. Compared with the untreated SCF reinforced CF/EP composite, MDI@SCF enhanced the interlaminar performance of the material by 10.06%. When the concentration of MDI treatment solution and SCF content was adjusted to the optimal value, the interlayer performance of the material increased by 17.01% compared to the pure CF/EP composite.
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