Strengthened, Self-Healing, and Conductive ENR-Based Composites Based on Multiple Hydrogen Bonding Interactions

Abstract

Endowing conductive composites with good self-healing properties is of great significance for improving the stability and extending the service life of the material. However, it is still a challenge to prepare conductive composites that exhibit both desirable mechanical strength and excellent self-healing properties. Herein, we report a simple method to fabricate a kind of material with excellent self-healing properties and satisfactory mechanical strength and conductivity performance. Nanochitin (CNC), carboxymethyl chitosan (CMCS), and carbon nanotubes (CNTs) were used as reinforcing fillers and filled into epoxidized natural rubber (ENR) through latex mixing. In particular, CNCs, CMCS, and CNT fillers were selectively dispersed among ENR latex particles. A filler frame network structure based on multiple hydrogen bonding interactions was constructed in the rubber matrix, which significantly improved the mechanical and electrical properties of the composites. Furthermore, the formation of multiple hydrogen bonds in the composites endowed the rubber with excellent self-healing properties, achieving the highest healing efficiency of 91%. This work provides a novel and simple strategy to prepare conductive composites with excellent mechanical and self-healing properties.

Nano-structured dynamic Schiff base cues as robust self-healing polymers for biomedical and tissue engineering applications: a review

“…The basis of intrinsic healing is generally based upon either non-covalent or dynamic covalent chemistries. Non-covalent chemistries include ligand-metal bonding (Zhan et al 2020), hydrogen bonding (Nie et al 2020), host-guest interactions (Sinawang et al 2020) and π-π stacking (Bertran et al 2020), while Dielalder (Ehrhardt et al 2020) and radical exchange (Balaji et al 2020) are examples of dynamic covalent chemistries. The following schematic (Fig.…”

Self-healing Materials: A Review of Recent Developments

“…Last several years, the importance of self-healing materials had been gradually recognized, and its mechanical properties, [10][11][12][13] energy absorption and conversion efficiency, and self-healing properties had yet to be further improved in scientific research and practical applications. For decades, scientists and engineers had invested heavily in developing self-healing materials to improve the safety, longevity, energy efficiency and environmental impact of man-made materials.…”

Multiple cross‐linked networks enhanced ENR‐based composite with excellent self‐healing properties

“…These characteristics are conducive to the introduction of other components to improve the mechanical properties and sustainability of ENR. Thus many researchers have studied the reinforcing and self‐healing property of ENR by introducing different fillers or curing systems, such as cellulose nanocrystals (CNs), 16,36 dodecanedioic acid (DA), and aniline trimer (ACAT) system, 37 sulfur (S), and 2,2′‐dithiodibenzoic acid (DTSA) system, 38 thermally reduced graphene oxide (TRGO), 39 Nanochitin (CNC), and carboxymethyl chitosan (CMCS) system, 40 etc. However, most of the fabricated materials are produced by the complicated preparation process, and show relatively inferior self‐healing effect with a healing efficiency of lower than 90%.…”