Papers by Author: H. Ismail

Abstract: The effect of natural weathering on tensile properties of low density polyethylene/ thermoplastic soya spent powder (TSSP) was studied. TSSP was produced by mixing the soya spent powder (SSP) with glycerol. Both blends were prepared by using internal mixer (brabender) at 150 °C with the SSP/TSSP content ranged from 0 to 25 wt%. Then, all the dumb-bell samples were exposed to Perlis environment located at Kubang Gajah, Perlis for 6 months period. The tensile properties were tested by using a universal testing machine (UTM) according to ASTM D638. LDPE/SSP blends presented lower strength and elongation at break (E_b) than LDPE/ TSSP blends meanwhile there were no Young’s Modulus values for 20 wt% onwards of both blends due to the brittle samples after 6 months of weathering.

Abstract: This study investigates the properties of blends made from low density polyethylene (LDPE) with various levels of thermoplastic soya spent powder (SSP). The thermoplastic TPSSP content was varied from 5 to 20wt % whereas epoxidised natural rubber with 50 mol % (ENR 50) act as compatibilizer to improve the interfacial adhesion between low density polyethylene and thermoplastic TPSSP. The effect of the addition of ENR 50 on the LDPE/thermoplastic TPSSP was measured by using tensile test and thermal behaviour. The tensile strength and elongation at break (E_b) decreased with increasing TPSSP content. However, the addition of ENR 50 resulted in the increment of tensile strength and E_b LDPE/TPSSP blends.

Abstract: SEM observations and Vickers-hardness tests were performed to identify the irradiation effects. γ- irradiation effect during the aging hardening process can be explained depending on the composition of the alloy and is used to derive quantitative information on the kinetics of the transformation precipitates. Increasing the Cu content of an Al-Cu alloy can improve the aging hardness. The present results of hardness behavior with SEM observations of surveillance specimens at different doses suggest that the radiation-induced defects are probably complex valance-solute clusters. These clusters act as nuclei for the precipitation of θ-Al2Cu type. This can be effectively utilized to study the systematic of nucleation of precipitates at vacancy-type defects. γ-irradiation probably play the key role in defects responsible for material strengthening and embrittlement.