Interfacial adhesion between fiber and matrix has a strong influence on composite mechanical performance: better interfacial adhesion can enhance composite transverse properties, flexural properties, and interlaminar shear strength, and so on. To exploit the reinforcement potential of the fibers in advanced composite, it is necessary to reach a deeper understanding on the relation between fiber wettability and interfacial adhesion. In our experiment, we study the influence of fiber wettability on interfacial properties of fiber/PPESK composites by choosing three kinds of fibers with different wettabilities. The relation between fiber wettability and surface free energy was discussed, and the influence of fiber wettability on the interfacial property of fiber/PPESK composites was analyzed. Results indicate that higher surface free energy can enhance the wettability between fiber and matrix, and the humid resistance and interfacial adhesion can be improved at the same time.

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Interfacial adhesion between fiber and matrix has a strong influence on composite mechanical performance. To exploit the reinforcement potential of the fibers in advance composite, it is necessary to reach a deeper understanding on the relation between fiber surface treatment and interfacial adhesion. In this study, air plasma was applied to modify carbon fiber (CF) surface, and the capability of plasma grafting for improving the interfacial adhesion in CF/thermoplastic composite was discussed and also the mechanism for composite interfacial adhesion was analyzed. Results indicated that air plasma treatment was capable of increasing surface roughness as well as introducing surface polar groups onto CF; both chemical bonding and mechanical interaction were efficient in enhancements of interlaminate shear strength of CF/PPESK composite, while mechanical interaction has a dominant effect on composite interfacial adhesion than chemical bonding interaction.

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Sodium-ion capacitors (SICs) have attracted growing attention since they can combine the advantages of sodium-ion batteries (SIBs) and electrochemical capacitors simultaneously. The key point of constructing SICs focuses on developing high electron conductive anode materials and overcoming huge volume variation during the sodiation/desodiation process to improve excellent cycling stability and rate performance. Here, lamellar Mo 2 C nanosheets assembled by Mo 2 C nanoparticles (NPs) were successfully synthesized via a facile hydrolysis method with a calcination process, demonstrating an outstanding rate capability with superior cycle stability at 0.5 A g −1 after 1200 cycles (0.097% decay per cycle from the second to the 1200th cycle) in the half cell. After coupling with a commercial activated carbon cathode, SICs demonstrates a high energy and power density of 76.1 Wh kg −1 at 112 W kg −1 and an excellent cycle life with 83% of the capacity retained after 4000 cycles. The research shows that the lamellar Mo 2 C nanosheets assembled by Mo 2 C nanoparticles as a competitive anode material for sodium-ion hybrid devices can accommodate the volume change during the sodiation/desodiation and shorten the Na + diffusion path because of its interconnected lamellar structure.

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