Tensile and Flexural Properties of Silica Nanoparticles Modified Unidirectional Kenaf and Hybrid Glass/Kenaf Epoxy Composites

Abstract

This paper investigates the influence of silica nanoparticles on the mechanical properties of a unidirectional (UD) kenaf fiber reinforced polymer (KFRP) and hybrid woven glass/UD kenaf fiber reinforced polymer (GKFRP) composites. In this study, three different nanosilica loadings, i.e., 5, 13 and 25 wt %, and untreated kenaf fiber yarns were used. The untreated long kenaf fiber yarn was wound onto metal frames to produce UD kenaf dry mat layers. The silane-surface-treated nanosilica was initially dispersed into epoxy resin using a high-vacuum mechanical stirrer before being incorporated into the UD untreated kenaf and hybrid woven glass/UD kenaf fiber layers. Eight different composite systems were made, namely KFRP, 5 wt % nanosilica in UD kenaf fiber reinforced polymer composites (5NS-KFRP), 13% nanosilica in UD kenaf fiber reinforced polymer composites (13NS-KFRP), 25 wt % nanosilica in UD kenaf fiber reinforced polymer composites (25NS-KFRP), GKFRP, 5 wt % nanosilica in hybrid woven glass/UD kenaf fiber reinforced polymer composites (5NS-GKFRP), 13 wt % nanosilica in hybrid woven glass/UD kenaf fiber reinforced polymer composites (13NS-GKFRP) and 25 wt % nanosilica in hybrid woven glass/UD kenaf fiber reinforced polymer composites (25NS-GKFRP). All composite systems were tested in tension and bending in accordance with ASTM standards D3039 and D7264, respectively. Based on the results, it was found that the incorporation of homogeneously dispersed nanosilica significantly improved the tensile and flexural properties of KFRP and hybrid GKFRP composites even at the highest loading of 25 wt % nanosilica. Based on the scanning electron microscopy (SEM) examination of the fractured surfaces, it is suggested that the silane-treated nanosilica exhibits good interactions with epoxy and the kenaf and glass fibers. Therefore, the presence of nanosilica in an epoxy polymer contributes to a stiffer matrix that, effectively, enhances the capability of transferring a load to the fibers. Thus, this supports greater loads and improves the mechanical properties of the kenaf and hybrid composites.

Effect of TiC nanoparticles on accelerated weathering of coir fiber filler and basalt fabric reinforced bio/synthetic epoxy hybrid composites: Physicomechanical and thermal characteristics

“…[71][72][73] However, the appearance of coir microparticles and TiC nanofillers enhanced the adhesion bonding of the fillers and polymers and suggested principles of energy absorption during the process of compression that offers more significant support against deformation. [37,38,[73][74][75]…”

Kenaf Fiber/Pet Yarn Reinforced Epoxy Hybrid Polymer Composites: Morphological, Tensile, and Flammability Properties

“…Nowadays, there are various new applications for kenaf, such as in furniture, composite boards, automotive panels, insulation mats, geotextiles, packaging, absorbents, building materials, and paper products. Kenaf also has commercial applications, such as in the automotive industry [ 37 , 50 , 51 ]. Large global corporations, such as Toyota Motor Corporation, have led the world in the use of kenaf.…”

Bionanocarbon Functional Material Characterisation and Enhancement Properties in Nonwoven Kenaf Fibre Nanocomposites

“…Applying kenaf fibre as a reinforcement agent has been widely reported in the literature due to its abundant nature, including its inherent properties such as high aspect ratio and superior toughness, non-abrasiveness, and biodegradability [ 16 , 17 ]. Due to its unique properties, Kenaf fibre has been utilised to reinforce composites applications [ 18 , 19 , 20 ]. Incorporating Kenaf fibre as filler in the matrix has been an efficient reinforcement agent for enhancing the interfacial interaction between fibre and matrix [ 19 , 21 ].…”

“…Due to its unique properties, Kenaf fibre has been utilised to reinforce composites applications [ 18 , 19 , 20 ]. Incorporating Kenaf fibre as filler in the matrix has been an efficient reinforcement agent for enhancing the interfacial interaction between fibre and matrix [ 19 , 21 ]. However, the challenge of low mechanical strength due to compatibility with hydrophobic polymer matrix and low thermal stability is yet to be addressed [ 18 ].…”