A Self-Healing Composite Material with Microwave Absorbing and Anticorrosion Properties Accelerated by Carboxylated Carbon Nanotubes

Abstract

Due to rapid self-healing characteristics, hydrogen-bonding composite materials have great potential in biological and medical fields. Carbon nanotubes have been widely used in composites and engineering fields because of their high aspect ratio and excellent mechanical, electrical, and chemical stability. Therefore, understanding how to combine carbon nanotubes with a hydrogen bond self-healing interaction can be important to expand the application field of selfhealing materials. In this paper, we designed and fabricated a kind of self-healing composite material with a rapid hydrogen-bonding interaction by polymerization of low molecular weight, aqueous poly(acrylic acid) (PAA) and high molecular weight polyvinylpyrrolidone (PVPON) with appropriate proportions of carboxylated multiwalled carbon nanotubes (MWCNTs-COOH) as additives. In addition, the self-healing process of the PAA-PVPON composites with different amounts of MWCNTs-COOH was simulated by molecular dynamics (MD). Our results showed that the composite materials performed excellent self-healing properties (initial self-healing time within 5 min, 75% of mechanical self-healing efficiency, and more than 100% anticorrosion self-healing efficiency), high reflection loss (<−27 dB), and high impedance modulus with only a 5 wt % MWCNTs-COOH addition. Moreover, the results of the MD calculation indicated that the MWCNTs-COOH could improve the ability of the composite materials to contact each other through the water layer, thus accelerating the self-healing speed on the basis of the increase of the density and attraction of the materials. Our work provided the experimental and theoretical basis for the application of MWCNTs-COOH in more hydrogen-bonding, self-healing composite materials.

Self-Healing and Self-Adhesion Conductive Hydrogels Reinforced by Carboxylated Carbon Nanotubes for High-Performance Wearable Strain Sensors

“…20 In another study, CNTs-COOH enhanced PAA/polyvinylpyrrolidone hydrogel showed enhanced mechanical properties and fast self-healing property that it could achieve 75% mechanical self-healing efficiency within 5 min. 21 Herein, dynamic hydrogen bonds and metal coordination were adopted to construct multifunctional PAA/PVA composite hydrogels with a DN network. Al 3+ was introduced into the system to form metal coordination bonds with − COOH of PAA and cCNTs to improve mechanical properties and self-healing ability.…”

“…A self-healing chitosan and polyacrylamide hybrid hydrogel with excellent flexibility and puncture resistance was prepared by carboxylated multiwalled CNTs (c-MWCNTs) cross-linked with chitosan . In another study, CNTs-COOH enhanced PAA/polyvinylpyrrolidone hydrogel showed enhanced mechanical properties and fast self-healing property that it could achieve 75% mechanical self-healing efficiency within 5 min …”

Application of Multilayered Blend Films as Soft, Stretchable, Self‐Adhesive, and Self‐Healing Absorption‐Dominant EMI Shielding and Microwave Absorber

“…Until now, only a few self-healable materials and designs for absorption-dominant EMI shielding or MWAs have been reported [18][19][20][21][22][23] despite significant advances made in the development of self-healing electrically conductive composites. [24][25][26][27][28][29][30][31] Although self-healing supramolecular materials are very promising, for example, due to their extraordinary stretchability, selfadhesiveness, and self-healing characteristics, [32][33][34][35] the level of properties required for EMWs absorption is not often possible to achieve at 1-30 GHz range with a thickness of less than 1 mm.…”

“…[24][25][26][27][28][29][30][31] Although self-healing supramolecular materials are very promising, for example, due to their extraordinary stretchability, selfadhesiveness, and self-healing characteristics, [32][33][34][35] the level of properties required for EMWs absorption is not often possible to achieve at 1-30 GHz range with a thickness of less than 1 mm. For example, in the case of non-patterned conductive materials, this can be due to initial surface reflection resulting from improper impedance matching at the air interface, [14,21,22] and with resistive gradients introduced to the structure the overall thickness increases. Thus, achieving efficient absorption and attenuation of EMWs with soft polymer composites and their multilayered or multimaterial assemblies often requires also blending of a relatively high content of electric and/or magnetic solid filler particles to the polymer matrices.…”

One-Pot Synthesis of Ag/AgCl Heterojunction Nanoparticles on Polyaniline Nanocone Arrays on Graphene Oxide for Microwave Absorption

“…Carbon materials, such as carbon nanotubes , and graphene, , have been considered as good candidates for electromagnetic functional materials due to their lightweight, high stability, and outstanding dielectric properties. However, their impedance mismatch and weak magnetic loss severely limit their application in the field of microwave-absorbing materials .…”