The impact of potassium permanganate (KMnO₄) treatment on the tensile strength of pineapple leaf fiber reinforced with tapioca-based bio resin

Abstract

PurposeThe impact of potassium permanganate (KMnO4) treatment on the tensile strength of an alkali-treated pineapple leaf fiber (PALF) reinforced with tapioca-based bio resin (cassava starch) was studied.Design/methodology/approachThe PALF was exposed to sodium hydroxide (NaOH) treatment in varying concentrations of 2.0, 3.7, 4.5 and 5.5g prior to the fiber treatment with KMnO4. The treated and untreated PALFs were reinforced with tapioca-based bio resin. Subsequently, they were subjected to Fourier transform infrared (FTIR) and tensile test analysis.FindingsThe FTIR analysis of untreated PALF revealed the presence of O-H stretch, N-H stretch, C=O stretch, C=O stretch and H-C-H bond. The tensile test result confirmed the highest tensile strength of 35N from fiber that was reinforced with 32.5g of cassava starch and treated with 1.1g of KMnO4. In comparison, the lowest tensile strength of 15N was recorded for fiber reinforced with 32.5g of cassava starch without KMnO4 treatment.Originality/valueBased on the results, it could be deduced that despite the enhancement of bioresin (cassava starch) towards strength-impacting on the fibers, KMnO4 treatment on PALF is very vital for improved tensile strength of the fiber when compared to untreated fibers. Hence, KMnO4 treatment on alkali-treated natural fibers preceding reinforcement is imperative for bio-based fibers.

Experimental investigation on strengthening of Zea mays root fibres for biodegradable composite materials using potassium permanganate treatment

“…The initial graft copolymerization and the generation of the cellulose radical in the permanganate treatment are both carried out by the extremely reactive Mn 3+ ions through the synthesis of MnO 3− ions. 11 , 38 , 58 . In order to generate cellulose manganate, hydroxyl groups in cellulose combine with extremely reactive permanganate ions.…”

“…The chemical structure of the Zm root fibres was examined both before and after the treatment to identify the functional groups and any surface alterations. This procedure increases the level of confidence in material confirmation and identification 34,58,59,70 .…”