Processing, structure and properties of polyacrylonitrile fibers with 15 weight percent single wall carbon nanotubes. (21st December 2020)

• Record Type: Journal Article
• Authors: Arias-Monje, Pedro J.; Lu, Mingxuan; Ramachandran, Jyotsna; Kirmani, Mohammad Hamza; Kumar, Satish
• Is Part Of: Polymer. Volume 211(2020)
• Publication Date: 2020-12-21
• Subjects: Single-wall carbon nanotube -- poly(acrylonitrile) -- Dry-jet wet-spinning -- Nanocomposite fiber -- Noncovalent functionalization; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2020.123065
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: For the first time, a polyacrylonitrile (PAN) fiber with up to 15 wt% single-wall carbon nanotubes (SWNTs) was produced by dry-jet wet-spinning while maintaining good SWNT individualization. These fibers exhibited a tensile modulus of 32.1 GPa, tensile strength of 0.8 GPa, and axial electrical conductivity of 2.2 S/m. This was possible by using SWNTs that were non-covalently wrapped with poly (methyl methacrylate) (PMMA-SWNTs). Furthermore, this non-covalent PMMA functionalization significantly reduced the amount of solvent and time needed for processing of the spinning solution, as compared to the methods used in prior studies. Rheology of the spinning dispersions and mechanical properties and structural parameters of the produced fibers were related to the filler individualization, filler content and presence of filler-matrix interaction. Potential applications of this PAN fiber with high SWNT loading are briefly discussed. Graphical abstract: Image 1 Highlights: PMMA-wrapping rendered unnecessary the addition of dilute SWNT dispersion to the PAN solution. Fiber had tensile modulus and strength of 32.1 and 0.8 GPa, respectively, and electrical conductivity of 2.2 S/m. PMMA-wrapping remains after fiber spinning and drawing, and thus becomes part of the SWNT-PAN -matrix interphase. PMMA-wrapped-SWNTs interact with PAN and nanofibril are obtained upon fiber dissolution in hot DMF.