Thiokol oligomer functionalized MWCNTs for epoxy nanocomposites. Issue 5 (1st July 2020)

• Record Type: Journal Article
• Authors: Wang, Haosheng; Li, Zewen
• Is Part Of: Pigment & resin technology. Volume 49:Issue 5(2020)
• Page Start: 347
• Page End: 353
• Publication Date: 2020-07-01
• Subjects: Composites -- Epoxy resins -- Nanotechnology -- Strength of materials -- Interfacial adhesion -- MWCNTs -- Thiokol oligomer; Protective coatings -- Periodicals; 667.62305
• DOI: 10.1108/PRT-04-2019-0036
• Languages: English
• ISSNs: 0369-9420

Abstract

Abstract : Purpose: This paper aims to feature preparation and characterization of thiokol oligomer functionalized MWCNTs/epoxy nanocomposites using low molecular weight polyamide as curing agent. Design/methodology/approach: First, thiokol oligomer functionalized MWCNTs (MWCNTs-TO) were prepared through hydroxylation, silanization and graft modification of MWCNTs. The nanocomposite specimens were fabricated through sonication and cast moulding process. The authors then investigated the impact of MWCNTs-TO content on mechanical and thermal properties of the nanocomposites. Findings: MWCNTs-TO with grafting ratio of 17.5 Wt.% was synthesized and characterized with X-ray photoelectron spectroscopy, thermal gravimetric analysis, Fourier transform infrared and scanning electron microscopy. The obtained epoxy nanocomposites exhibit improved mechanical properties and thermal stability with MWCNTs-TO added. Moreover, desirable results were obtained at 0.75 Wt.% of MWCNTs-TO loading: the young's modulus, tensile, flexural and impact strength increased by 24.6, 72.8, 34.8 and 82.7%, respectively, compared to the neat epoxy. The improvement of mechanical properties is mainly attributed to enhanced interfacial interaction and dispersion between the covalent functionalized MWCNTs and epoxy matrix. Research limitations/implications: A flexible thiokol oligomer was successfully grafted onto MWCNTs via a mild route. Nanocomposites with excellent interfacial interaction and dispersion between MWCNTs-TO and the epoxy matrix have been successfully fabricated and investigated. Practical implications: This method provided a mild and practical approach to improve the performance of MWCNTs epoxy nanocomposites. Originality/value: A flexible thiokol oligomer was successfully covalent grafted onto MWCNTs via a mild route. Nanocomposites with excellent interfacial interaction and dispersion between MWCNTs-TO and the epoxy matrix have been successfully fabricated and investigated.