Quantitative construction of variable modulus interfacial layer between aramid fibers and rubber composites utilizing polymerizable deep eutectic solvents for enhancing interfacial and mechanical properties

Based on the nanomechanical analysis of aramid fibers and rubber, a variable modulus interfacial layer between aramid fibers and rubber was quantitatively constructed using a polymerizable deep eutectic solvents and graphene oxide. The effect of this variable modulus interfacial layer on the interfacial and mechanical properties of aramid fiber/rubber composites was investigated. The interfacial properties of the composites were significantly improved as the modulus difference between the aramid fibers and the coating became smaller and the interphase increased. A modulus interfacial layer with a platform role was established between high-modulus aramid fibers and low-modulus rubber. A schematic model of the reinforcement mechanism of the modulus interfacial layer was proposed. This modulus interfacial layer with a platform in the aramid fiber and rubber composite facilitated the transfer of stress concentration, inhibited microcrack expansion, and enhanced the interfacial bonding properties between the aramid fibers and the rubber matrix. The method of constructing the coating is characterized by fast reactions, minimal pollution, and the ability to be produced continuously and intelligently, providing a novel approach to modifying aramid fiber and preparing high-performance composites.