Effect of surface modification of sisal fibers on water absorption and mechanical properties of polyaniline composite

Abstract

This article presents the surface modification of sisal (Agave sisalana) fibers by alkalization to tune up mechanical limitations of natural fibers‐reinforced polymer composites associated with poor fiber‐polymer matrix compatibility. Upon surface treatment, the fibers were surface coated with polyaniline through in situ oxidative polymerization to further enhance resistance to water absorption by introducing hydrophobic polymer backbone. Based on the results from spectroscopic and microscopic analyses, surface modification through alkalization is an effective approach to remove lignin and hemicellulose from the surface of sisal fibers. It also enhanced fiber‐polymer matrix compatibility assured by a significant increase in tensile strength. Polyaniline deposition on the surface of sisal fibers was successful to introduce hydrophobic polymer backbone to the system to enhance resistance to water absorption, thereby increasing tensile strength significantly. POLYM. COMPOS., 40:E46–E52, 2019. © 2017 Society of Plastics Engineers

Polyaniline Deposition on the Surface of Cotton Fibers: Structural Studies, Swelling Behavior, and Water Absorption Properties

“…is is an evidence that polyaniline is insoluble in water and in other polar media. Results of this study are in good agreement with prior works by the authors on sisal fibers [25].…”

“…Polyaniline-deposited cotton fiber immersed in chloroform and deionized water (as control) is exposed to Mesdan Autowash with a speed of 40 rpm at 60°C for 90 minutes wash time. e concentration of extracted polyaniline was then analyzed using Perki-nElmer Lambda 9 UV-Visible spectrophotometer in the wavelength region of 200-800 nm [25].…”

“…Swelling behavior of cotton and polyaniline-deposited cotton fiber was measured using an optical microscope which is well fitted with a high-resolution Leica camera. It also had image analysis software (Mesdan video analyzer) which allowed the measurement of fiber diameter at various points [25]. e presented diameter was an average of measurements taken at ten different locations along the fiber length.…”

Removal of Pb(II) from aqueous media using adsorption onto polyaniline coated sisal fibers

“…Ten grams of SF was soaked in 0.2 M HCl solution. One hundred and fifty milliliters of 0.5 M aqueous aniline solution was added to the flask containing acidified fiber on stirring for 30 min to homogenize the system; after that, 150 mL of equimolar FeCl 3 .6H 2 O solution was added to the mixture dropwise to initiate oxidative polymerization on continous stirring . The polymerization process was set for 12 h at room temperature.…”

5 Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP) © Copyright: All rights reserved. Retrieval Number: A10771291S419/2019©BEIESP DOI:10.35940/ijeat.A1077.1291S419 Journal Website: www.ijeat.org Water Absorption Behavior on Natural/ Synthetic Fibre Reinforced Polymer Composites

“…The composite once coated with silane showed better mechanical characteristics and improved water absorption resistance. Deposition of Polyaniline, a conductive and non-toxic polymer over the sisal fibre surface created a barrier for water and hence the mechanical properties get increased [8]. The hybridization of FRP composites improvised the water absorption limit whereas the polymer matrix reinforced with natural fibre made a loss in tensile strength to 27% and tensile modulus from 15 to 35% on immersed in water for a period of one month [9].…”