Poly(<i>p</i>-phenylene benzobisoxazole) Fiber/Epoxy Composites Reinforced with Carbon Nanotubes and Graphene Oxide for Enhanced Interfacial Adhesion and Mechanical Strength

Liu, Zhide; Chen, Lei; Ma, Lichun; Huang, Yudong

doi:10.1021/acsanm.1c02679

Cited by 5 publications

(4 citation statements)

References 42 publications

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“…The measured contact angle was 37.5°, indicating outstanding adhesion and wettability. 64 This attractive feature avoided the formation of cracks and holes, which was conducive to strengthen the interface phase. The interface performance was assessed using the interfacial shear strength (IFSS) between the CF and EP-IMD in Figure 7b.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Closed-Loop Recycling of Carbon Fiber-Reinforced Composites Enabled by a Dual-Dynamic Cross-linked Epoxy Network

Liu

Yang

et al. 2023

ACS Sustainable Chem. Eng.

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The development of covalent adaptable networks has addressed the issue that conventional epoxy thermosets are difficult to degrade and reprocess, but the greater challenge lies in how to overcome the trade-off between excellent degradability and mechanical properties such as stiffness and extensibility. Herein, a new concept of a dual-dynamic cross-linked network composed of dynamic covalent and non-covalent bonds (imine bonds and hydrogen bonds) was proposed for closed-loop recovery of epoxy thermosets/composites. Among them, the additional non-covalent crosslinks were constructed through the designed imine-containing hardener as the medium. The cooperative effects of hydrogen-bond interactions and molecular interlocking of rigid–flexible molecular chains enhanced greatly the stiffness and ductility, and the recoverable energy dissipation enabled the prepared epoxy thermoset to have excellent fracture toughness. Its tensile strength and impact strength reached ∼80.3 MPa and ∼24.2 kJ/m2, respectively. Importantly, driven by the pH-sensitive feature of the dual-dynamic network, the resultant thermoset was completely degraded within 3 h. Along the closed-loop sustainable route, the recoverable oligomer from the thermoset/matrix resin showed good potential in toughening brittle materials with a 55–94% increase in impact strength. Further, the recovered CF cloths that kept their usage value were re-prepared into new high-performance composites, realizing the conversion of waste to high-value applications.

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Section: ■ Results and Discussionmentioning

confidence: 99%

“…As shown in Figure a, the prepared epoxy thermoset completely wrapped the CF monofilament, and each ball showed a uniform size. The measured contact angle was 37.5°, indicating outstanding adhesion and wettability . This attractive feature avoided the formation of cracks and holes, which was conducive to strengthen the interface phase.…”

Section: Resultsmentioning

confidence: 99%

Closed-Loop Recycling of Carbon Fiber-Reinforced Composites Enabled by a Dual-Dynamic Cross-linked Epoxy Network

Liu

Yang

et al. 2023

ACS Sustainable Chem. Eng.

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“…In summary, the successful grafting of GO onto the CF surface forms a multiscale reinforced body that increases the roughness of CF, resulting in enhanced interfacial adhesion between CF and the matrix. − …”

Section: Resultsmentioning

confidence: 99%

Improving the Tribological Performance of Phosphate-Bonded Coatings Reinforced by Carbon Fiber/Graphene Oxide

Zheng

Bian

et al. 2023

ACS Appl. Nano Mater.

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To enhance the interfacial bond strength of carbon fiber (CF), graphene oxide (GO) was grafted onto the CF surface byγ-aminopropyl triethoxysilane, and CF modified with GO (CF-GO) was added into the phosphate-bonded coating as a reinforcement to improve the tribological properties of the coating. In addition, the evolution of the physiochemical structure of CF before and after the modification was investigated by Fourier transform infrared spectroscopy, X-ray diffraction analysis, X-ray photoelectron spectroscopy, and scanning electron microscopy. The results show that GO and CF are chemically bonded together, and the CF surface becomes rough due to the presence of GO, enhancing mechanical engagement to improve the interfacial bond between CF-GO and the coating matrix, which is improved by the CF pull-out test. Tribological tests were conducted to investigate the wear behavior of the coating. The friction coefficient of the coating decreases with the increase of CF-GO. Besides, the wear rate of the coating shows similar trends with the addition of CF-GO. The addition of 15 wt % CF-GO has reduced the coefficient of friction and wear rate of the coating by approximately 18 and 40%, respectively, when compared to those of the coating without GO-CF. The related mechanisms are also clarified.

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“…In contrast, GO exhibited a strong and sharp (001) peak at 2θ = 11.29° and the layer spacing was 0.78 nm. The layer spacing of GO was larger than that of rGO, and it could be inferred that GO had a larger layer spacing because of the insertion of oxygen-containing groups and GO generated a new crystal structure [ 46 ].…”

Section: Resultsmentioning

confidence: 99%

Improvement of Mechanical Properties and Solvent Resistance of Polyurethane Coating by Chemical Grafting of Graphene Oxide

Liang

Yao

et al. 2023

Polymers

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Waterborne polyurethane coatings (WPU) are widely used in various types of coatings due to their environmental friendliness, rich gloss, and strong adhesion. However, their inferior mechanical properties and solvent resistance limit their application on the surface of wood products. In this study, graphene oxide (GO) with nanoscale size, large surface area, and abundant functional groups was incorporated into WPU by chemical grafting to improve the dispersion of GO in WPU, resulting in excellent mechanical properties and solvent resistance of WPU coatings. GO with abundant oxygen-containing functional groups and nanoscale size was prepared, and maintained good compatibility with WPU. When the GO concentration was 0.7 wt%, the tensile strength of GO-modified WPU coating film increased by 64.89%, and the abrasion resistance and pendulum hardness increased by 28.19% and 15.87%, respectively. In addition, GO also improved the solvent resistance of WPU coatings. The chemical grafting strategy employed in this study provides a feasible way to improve the dispersion of GO in WPU and provides a useful reference for the modification of waterborne wood coatings.

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Poly(p-phenylene benzobisoxazole) Fiber/Epoxy Composites Reinforced with Carbon Nanotubes and Graphene Oxide for Enhanced Interfacial Adhesion and Mechanical Strength

Cited by 5 publications

References 42 publications

Closed-Loop Recycling of Carbon Fiber-Reinforced Composites Enabled by a Dual-Dynamic Cross-linked Epoxy Network

Closed-Loop Recycling of Carbon Fiber-Reinforced Composites Enabled by a Dual-Dynamic Cross-linked Epoxy Network

Improving the Tribological Performance of Phosphate-Bonded Coatings Reinforced by Carbon Fiber/Graphene Oxide

Improvement of Mechanical Properties and Solvent Resistance of Polyurethane Coating by Chemical Grafting of Graphene Oxide

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