Combining hydrophilic MXene nanosheets and hydrophobic carbon nanotubes for mechanically resilient and electrically conductive elastomer nanocomposites. (29th September 2021)

• Record Type: Journal Article
• Authors: Aakyiir, Mathias; Oh, Jeong-A; Araby, Sherif; Zheng, Qunhui; Naeem, Mohannad; Ma, Jun; Adu, Philip; Zhang, Liqun; Mai, Yiu-Wing
• Is Part Of: Composites science and technology. Volume 214(2021)
• Publication Date: 2021-09-29
• Subjects: A. Carbon nanotubes -- Nano composites -- B. Multifunctional properties -- Synergism; Composite materials -- Periodicals; Composite materials; Fibrous composites; Periodicals; 620.118
• DOI: 10.1016/j.compscitech.2021.108997
• Languages: English
• ISSNs: 0266-3538

Abstract

Abstract: It is challenging to process elastomers with two types of fillers having disparate morphologies and surface properties. In this study, hydrophilic Ti3 C2 Tx MXene nanosheets and hydrophobic carbon nanotubes (CNTs) were compounded with an elastomer latex to prepare 3-phase nanocomposites that demonstrated highly improved mechanical and functional properties. Multi-walled CNTs were modified with hexadecyltrimethylammonium bromide (CTAB) to produce an overall positive surface charge. The modification yielded not only a spontaneous electro-static interaction between MWCNTs and the negatively charged MXene nanosheets but also promoted a relatively uniform dispersion of the hybrid nanofiller in the elastomer matrix. Raman and X-ray photoelectron spectroscopy confirmed the modification of MWCNTs and the structural integrity of both nanofillers. The hybrid fillers achieved remarkable compatibility with the matrix through the reactions between Ti in Ti3 C2 Tx MXene and N in both the elastomer (nitrile rubber) and the modifier (CTAB). Micrographs revealed an enhanced degree of filler dispersion compared with those nanocomposites containing non-assembled fillers. Due to the bridged and interconnected structures of the hybrid fillers, the electrical conductivity of the resulting nanocomposites was markedly increased and the mechanical properties (e.g., tensile strength and tangent modulus) displayed much improved synergism. In addition, the chemical resistance was substantially increased due to the network formed between the hybrid fillers and the elastomer macromolecules. Graphical abstract: Image 1 Highlights: Hydrophobic nanotubes and hydrophilic MXene combined within an elastomer. Interface interactions between the hybrid filler and the elastomer. Synergistic mechanical properties and functionality of elastomeric nanocomposites.