Improvement of mechanical properties of an Aramid fibre under various environmental condition with the application of nanocomposites

High strength fibre such as Kevlar 29 is characterized by its high strength to weight ratio and its impact Strength. The overall intention of this study is to investigate options for the creation of techniques to improve the resistance of high strength fibres to Ultra Violet radiation (UV) and understanding its mechanism of the UV instability. The chemical composition is prepared by Sol-Gel technique and Hydrothermal analysis using TiO2/SiO2/Al2O3 with PEG (Various molar ratio) with controlled temperature. The Sol-gel particles size are measured by using DLS and XRD. The temperature degradation rate is also carried out by Thermo gravimetric analysis (TGA) to find out the moisture content and its degradation over temperature. The Kevlar fibers are then coated with prepared Sol-gel and kept for 3 days for ageing purposes and stabilization. The UV radiation is directly exposed to Kevlar fibre for over a period of time in the order of 2, 4, 8... 120 hours. Following these treatments, the changes in fibre topography, chemical compositions of the fibre surfaces, and the surface functional groups introduced to the surface of fibres were identified by SEM. The strength of the coated and uncoated fiber is identified by single fiber tensile test to determine the UV degradation to the total strength. The result shows the 9 % decrease in degradation rate to the strength of Kevlar fibre and compared to coated fiber. The effect of temperature to strength is also identified by dynamic mechanical analyser and studied about the temperature effects over coating. From our work, the results of the effect of UV exposure time on the strength loss, and temperature has been studied