Abstract
In this paper, an innovative concept of alternating distributed large and small amounts of CNT/polyether amine coating is proposed to be wrapped around the carbon fiber via vacuum filtration. This coating feature is similar to “concave-convex” interval structure, which significantly distinguishes it from widely reported CNT coating with uniform encapsulation. The modified fiber reinforced epoxy composite presents a tremendous enhancement in interfacial bond strength reaching up to 81.8% relative to de-sized fiber composite. This increase comes from the synergistic effects of alternating distribution of strong-weak interactions that effectively dissipating energy, improved wettability, increased mechanical interlocking, as well as pinning and crack suppression effects of CNTs. The concept of interval distribution of large and small levels of coating has more possibilities for optimization. Thus, this unique coating structure, simple and flexible approach provides an attracting candidate for enhancing interphase performance of composites, also with the potential of practical and scalable.
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