Grafting of the hierarchical natural tannic acid and polyethyleneimine onto carbon fiber for significantly improved surface/interface properties

Abstract

The interfacial adhesion between carbon fibers (CFs) and matrix is mainly controlled by inherent surface structures and mutual wettability. However, CFs, with superior properties, have the low of surface wettability and activity. Changing the fiber surface can enhance the quality of interface, which expands the engineering application of CFs composites. Noticeably, the most traditional procedures involve the deterioration of fiber structure by multistep manipulation to introduce active sites, toxic reagents, high energy consumption, as well as the poor interfacial interaction between the fibers and the modified materials by the coating or deposition. Herein, an environmentally friendly and mild strategy was facilely designed via firmly coating tannic acid (TA, a renewable plant‐based polyphenol, the versatile adhesive) and then covalently grafted branched polyethyleneimine (PEI) onto the fiber surface. The novel grafting significantly increased fiber surface polarity, roughness and interfacial wettability without destroying surface microstructure, resulted in the sharp improvements in interlaminar shear strength (ILSS, 51.34 MPa) and interfacial shear strength (IFSS, 66.21 MPa). Impact strength and hydrothermal aging resistance of the resulting composites were also greatly increased. The hierarchical reinforcement arising from a promising and green strategy is facile to be prepared advanced polymer composites in multifunctional applications with the demand of highly interfacial properties and the usages of energy conservation.

Polyhedral Oligomeric Silsesquioxane Encountering Tannic Acid: A Mild and Efficient Strategy for Interface Modification on Carbon Fiber Composites

“…The peak fitting of C 1s and N 1s regions’ deconvolution spectra is used to evaluate the detailed chemical bonds of the fiber surface (displayed in Figure b–e, Table S2 and Figure S2). For the C 1s spectra, the original three peaks are assigned to C–C (284.6 eV), C–N (285.7 eV), and C–O (286 eV) of the de-sized CF. ,,, After co-deposition of TA/POSS on the fiber surface, four new peaks are observed, which can be assigned to C–Si (284.2 eV), CN (287 eV), CO (288.1 eV), and O–CO (289 eV). ,,,, …”

“…For the C 1s spectra, the original three peaks are assigned to C−C (284.6 eV), C−N (285.7 eV), and C−O (286 eV) of the de-sized CF. 2,28,33,34 After co-deposition of TA/POSS on the fiber surface, four new peaks are observed, which can be assigned to C−Si (284.2 eV), CN (287 eV), CO (288.1 eV), and O−CO (289 eV). 1,6,28,30,35 Interestingly, the C−Si and C−N contents markedly increase from 0 and 5.07% (de-sized CF) to 19.94 and These results indicate that the elevated mass of POSS−NH 2 assists in the cross-linking reaction between TA and POSS− NH 2 , resulting in the co-deposition of more adhesion coating on the fiber surface.…”

“…Carbon fiber-reinforced plastic (CFRP) has demonstrated promising application prospects against the background of lightweight requirements due to its exceptional physicochemical properties, including high specific strength, corrosion resistance, and strong plasticity. − It is necessary to develop a low-damage, environmentally friendly, and highly efficient surface-controllable technology to significantly improve the mechanical properties of CFRP. Recently, the polymeric pigment as a competitive candidate exhibited active surface functionality and demonstrated numerous promising performances without destroying the strength and ordered structures of carbon fibers.…”

Influence of SiC nanoparticles on properties of alkali‐treated areca fruit husk fiber/hybrid polymer composites

“…The addition of carbon nanotube filler in polymer composite considerably enhanced the electrical and mechanical properties of the composite. 17 But the high cost of carbon nanotubes forced the researchers to opt for graphene as filler to enhance the functional properties of the polymer composite. 18 The enhancement of mechanical properties of the polymer composite with graphene particles as filler is contributed by the twodimensional nanostructure of graphene.…”

One‐step anchored polymers via phenolamine bionic design on textile‐based heater for application in personal heat management

“…Furthermore, the high cost of PDA should be taken into consideration when applied to industrial productions. 30 Indeed, there is still an urgent requirement for a low-cost, polyphenol-rich alternative in the market. Tannic acid (TA), as a dye-fixative and metal mordant in the textile industry, has drawn generous interest in virtue of fabulous anchoring and coordinating capability onto almost all kinds of substrates by pHinduced oxidative polymerization.…”