Abstract
Aramid fiber reinforced composites (AFRC) have attracted considerable attention because of its high strength and modulus. But the poor interface due to the smooth fiber surface and few active groups limits the application of the final composites. In this study, robust AFRC was achieved via dip-coating approach. Instead of Kevlar fiber, sulfone-functionalized poly(p-phthaloyl-p-phenylenediamine) (SPPTA) was served as precursor to prepare nanocoating solution. By further grafting epichlorohydrin (ECH) and Shellac (SLC), the functional coating solution was obtained. After modification, the roughness and the polarity of the fiber were considerably improved. The modified AF/epoxy composites showed excellent interfacial bonding and mechanical properties. For the sample grafted with SLC, the interfacial shear strength (IFSS) reached 43.7 MPa with a significant enhancement by 21.4 %; while the inter-laminar shear strength (ILSS) reached 48.6 MPa with a reinforcement of 45.9 %. The flexural strength and tensile strength were increased to 283 MPa and 831 MPa, indicating that the study provides an effective method to achieve high strength AFRC.
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Acknowledgments
This work was supported by the Natural Science Foundation of Shanghai (17ZR1401100). We are sincerely grateful for the financial support this paper received. At the same time, we would like to thank Zhao Dacheng of the Center for Civil Aviation Composites for their VARI molding assistance.
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Li, T., Wang, Z., Cao, Y. et al. Preparation of Robust Aramid/Epoxy Composites through Enhancing the Interface Performance by Nanocoating Solution. Fibers Polym 23, 1077–1088 (2022). https://doi.org/10.1007/s12221-022-4414-7
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DOI: https://doi.org/10.1007/s12221-022-4414-7