An experimental investigation of flame retardancy and thermal stability of treated and untreated kenaf fiber reinforced epoxy composites
Author:
Muralidharan Nivedhitha Durgam1, Subramanian Jeyanthi1, Rajamanickam Sathish Kumar2, Gopalan Venkatachalam3
Affiliation:
1. School of Mechanical Engineering , Vellore Institute of Technology , Chennai 600127 , Tamil Nadu , India 2. Department of Automobile Engineering , Hindustan Institute of Technology and Science , Chennai 603103 , Tamil Nadu , India 3. Centre for Innovation and Product Development , Vellore Institute of Technology , Chennai 600127 , Tamil Nadu , India
Abstract
Abstract
Natural fiber reinforced polymeric composites perform poor in mechanical and thermal properties at elevated temperatures due to the cellulose and hemicellulose contents of natural fiber start degrading at elevated temperature. In this research work, flame retardancy and thermal stability of treated and untreated kenaf fiber reinforced epoxy composites have been experimentally investigated and reported. Two composite laminates, one with 6 % NaOH Alkali treated and another with untreated woven kenaf mats, were fabricated by hand lay-up technique followed by compression molding with 40 % fiber weight fractions. Flame retardancy test and various thermal characteristics studies such as thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), heat deflection temperature (HDT), and morphological analysis via scanning electron microscopy (SEM) tests were carried out. The results showed that alkali treated kenaf fiber composite achieved V0 fire retardancy grade. The major weight losses, 86 % and 75.5 % for untreated and treated composites respectively were recorded between 300 °C and 450 °C. 13.6 % increase in HDT was noted for treated composite with 0.25 mm deflection at 0.45 MPa pressure condition. Thus the composite laminate with 6 % NaOH alkali-treated kenaf fiber achieved the best thermal stability with less degradation which is more suitable for automobile and aerospace applications.
Publisher
Walter de Gruyter GmbH
Subject
Materials Chemistry,Polymers and Plastics,General Chemical Engineering
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