Data set on Effect of Alkaline Treatment of Sisal Fiber on Mechanical property Reinforced Polyester Composite

Published: 05-11-2019| Version 1 | DOI: 10.17632/3z6sgfmx2f.1
Adane Adugna Ayalew


The fibers reinforced polymer composites (FRPCs) are developed primarily using synthetic fibers. Currently synthetic fibers have serious drawbacks such as high cost, high density, poor recycling and non-biodegradable properties as compared to polymers composites. For these reasons, it needs to the extraction of natural fiber as replacement of synthetic fibers and as for reinforcement polymer composites from plants which is availability from renewable natural resources and the biodegradability of the natural plant fibers present a healthy ecosystem and low costs. The operational parameter (effect of NaOH concentration, soaking time and fiber to polyester ratio) for evaluating of mechanical properties (tensile strength bending strengths and water absorption on to raw and composite fiber were investigated. Preferred result for the desired purpose which have higher mechanical properties has been found as 44.003 MPa tensile strength and 50.81Mpa bending strength at optimum 30:70 fiber to polyester matrix ratio within 6 %NaOH at 48 hour, and the water absorption was lowered at 72 hour with 6% NaOH concentration and 20:80 fiber to polyester ratio which is 3.194%. Treated sisal fibers reinforced polyester composites were better mechanical properties and poor water absorption than untreated fiber.


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The fiber was collected and extracted from dried stalk of sisal plant which was harvested from Bahir Dar, Ethiopia specifically Debanke Mountain. The chemical reagent of analytical grade such as sodium hydroxide, sodium chlorite, sodium bisulphate, ethanol, and glacial acetic were procured from research laboratory. The fibers were present in the outer layer of the stem of sisal plant. They were striped-off from the stalk manually and kept for retting in the water for 10 days. The material was then removed from the water and beaten with a wooden hammer to loosen them. These fibers were then wash continuously under running water, sun dried, combined and brushed to get uniformly cleaned fibers. Mechanical methods followed by chemical treatment were selected for fiber extraction and to remove cementing compounds (mostly waxes, hemicelluloses, lignin and hydrocarbons). Since mechanical method is not efficient to remove the impurities it only removes the resinous material. Sodium hydroxide was used in fiber extraction dissolves the lignocelluloses material between fibers and separates structural linkages between lignin and cellulose, which leads to increased surface area. Raw extracted sisal fibers were treated with different concentration (2wt %, 6%wt, and 10%) aqueous solutions of NaOH at room temperate and for different soaking (24, 48, and 72 hours) to improve the adhesion between the fiber and matrix. Further the fibers removed and wash continuously with excess water, neutralized with using dilute acetic acid. The fibers were dried by sun dryer for 24 hr. Universal tensile testing machine tester was used to test tensile strength of fiber, and tensile strength and bending strength of composites. Hand loom machine was used for mat formation. A JASCO MODEL 4100 Fourier Transformed Infrared Radiation (FTIR) Spectrometer was used to measure the absorption transmittance of IR radiation of fiber cellulose. The fiber diameter was determined by using an optical (QUIMS, Q711FT) instrument. The tensile test was performed using TA.XT plus texture analyzer with a load capacity of 500N and a displacement speed of 0.03 mm/s for the fibers and 0.08 mm/s for the films. The bending strength of the treated and untreated fiber was determined by the standards (ASTM D1037:1999) method. The operational parameter, effect of NaOH concentration, soaking time and fiber to polyester ratio were studied