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Cellulose nanofibers (CNFs) are sustainable materials with high specific strengths. To enhance the impact properties of carbon fiber reinforced plastics (CFRPs), the authors have developed an efficient process for incorporating a non-hydrophobized CNF dispersion layer into CFRPs. In this study, the impact properties of CFRP with asymmetrically stacked CNF dispersion layer was investigated by conducting the instrumented Charpy impact tests. Two types of CNFs were used for comparison. Consequently, by inserting the CNF dispersion layer into the opposite side of the striking surface, the Charpy impact value increased by 26% compared to CFRP without CNF dispersion layer. [ABSTRACT FROM AUTHOR]

Cellulose nanofibers (CNFs) are a plant-derived material with a high specific strength. The authors have developed a method to enhance the impact properties of carbon fiber reinforced plastics (CFRP) by inserting a non-hydrophobic CNF dispersion layer between prepregs. In this study, the specimens with different stacking sequence of the prepreg and CNF dispersion layer were manufactured, and the instrumented Charpy test was carried out. Analyzing the impact waveform, when the CNF dispersion layer was inserted below the surface prepreg, the Charpy impact value was increased by up to 6% compared to the CFRP without the CNF dispersion layer. [ABSTRACT FROM AUTHOR]

Cellulose nanofibers (CNFs) are environmentally friendly materials with a high specific strength. To enhance the impact properties of the carbon fiber reinforced plastics (CFRPs), a method for inserting a CNF dispersion layer between prepregs was developed. By using an aqueous solution of epoxy resin, the hydrophobic treatment of CNF became unnecessary. In this study, CFRP with CNF dispersion layers was fabricated with different CNF content. The impact energy absorbed by the CFRP specimen was increased with the increasing CNF content, and the Charpy impact value increased up to a maximum of 21% by the CNF dispersion layers. Carbon fiber reinforced plastics (CFRPs) specimens with the cellulose nanofiber (CNF) dispersion layer were fabricated. The specimens were fabricated by varying the content of CNF. Impact energy absorbed by the CFRP specimen was increased with increased CNF content. Charpy impact value increased up to 21%; optimum ductility index value was clarified. [ABSTRACT FROM AUTHOR]

Cellulose nanofibers (CNFs) are environmental-friendly nanofiller with high strength and lightweight. To improve the impact properties of carbon fiber reinforced plastics (CFRPs), the application of CNF is expected. However, hydrophobic treatment was unavoidable due to its hydrophilicity. In this study, by adopting an aqueous solution of epoxy resin, the CFRP with CNF dispersion layer was fabricated. From the instrumented Charpy test, it was revealed that the waveform of impact force has two peaks, and the second peak was enlarged by the CNF dispersion layer. As a result, Charpy impact value of the CFRP was increased up to 6%. A novel method to enhance the impact properties of carbon fiber reinforced plastic (CFRP) by using cellulose nanofiber (CNF) was developed. By dispersing CNFs in an aqueous epoxy solution, hydrophobic treatment was eliminated. Inserting the CNF dispersion layer increased the Charpy impact value of CFRP up to 6%. [ABSTRACT FROM AUTHOR]

An efficient method to increase specific strength of carbon fiber reinforced plastics (CFRP) by using cellulose nanofibers (CNFs) was developed. Eliminating a complex hydrophobic treatment of CNF by using aqueous electrodeposition solution (EDS) containing a polymer with epoxy group, the CFRP with CNF/resin layer was fabricated. The effects of the CNF/resin layer on the bending properties of CFRP were clarified by varying the weight fractions of CNF. The specific flexural rigidity and strength of the CFRP with CNF/resin layer were increased to approximately 3.5 times and 1.8 times those of the CFRP without CNF/resin layer, respectively. [ABSTRACT FROM AUTHOR]

Many researches on strengthening the matrix of Carbon Fiber Reinforced Plastic (CFRP) using cellulose nanofibers (CNFs) have been reported. However, hydrophobic treatment to modify the surface of CNFs is indispensable. Authors previously showed that the bending properties of CFRP were enhanced by CNF without hydrophobic treatment after the electro-activated deposition resin molding (ERM) method. CNF can be dispersed on the surface of CFRP since the electro-activated deposition solution is water based. In this study, first, it was confirmed that the tensile properties of CFRP could be enhanced by CNF dispersed on the surface after the ERM method. Also, the weight fraction of CNF was optimized to maximize the tensile properties. Second, the I-shaped cross-sectional beam (I-beam) was molded by laminating the CFRP with CNF dispersed on the surface. It was confirmed that the bending properties of the CFRP I-beam was enhanced by CNF, and the effect of CNF on the interlaminar strength was evaluated. [ABSTRACT FROM AUTHOR]

The I-shaped cross-sectional beam of CFRP (CFRP I-beam) is usually manufactured by the continuous protrusion method. Carbon fibers can only be arranged in the longitudinal direction. The CFRP I-beam with arbitrary arrangement of carbon fiber was manufactured with applying the electro-activated deposition molding method. The carbon fiber fabric was immersed in the deposition solution and energized, epoxy resin precipitated around carbon fiber and impregnated. The resin-impregnated fabric was installed to the mold, and the CFRP I-beam was fabricated. The CFRP I-beam was subjected to three-point bending tests, and the relationship between load-deflection was simulated by finite-element analysis. [ABSTRACT FROM AUTHOR]