Showing papers by "Abu Bakar published in 2018"
TL;DR: In this article, the effect of treatment on the behavior of processing torque, mechanical properties, morphology, functional groups, water absorption, and thermal stability of KNF/LLDPE/PVOH composites was investigated.
Abstract: Untreated kenaf (KNF) and eco-friendly coupling agent (EFCA)-treated kenaf were used as filler to prepare natural fiber-reinforced polymer composites (NFPCs) using linear low-density polyethylene (LLDPE) and poly(vinyl alcohol) (PVOH) as polymer matrices. The composites containing various loadings of untreated and EFCA-treated KNF (0, 10, 20, and 40 phr) were melt-blended in an internal mixer. The effect of treatment on the behavior of processing torque, mechanical properties, morphology, functional groups, water absorption, and thermal stability of KNF/LLDPE/PVOH composites were investigated. The results revealed that EFCA-treated KNF composites exhibited higher equilibrium torque, indicating that the viscosity of molten composites increased in the presence of EFCA. The tensile strength and tensile modulus of KNF/LLDPE/PVOH composites were improved with the addition of EFCA-treated KNF attributed to the enhancement of the interfacial adhesion between KNF and LLDPE/PVOH matrices, as confirmed by field-emission scanning electron microscopy. Fourier transform infrared spectroscopy indicated the presence of ester bond in EFCA-treated KNF composites. Furthermore, EFCA-treated KNF composites possessed a lower water absorption and greater thermal stability as compared to untreated KNF composites. Therefore, EFCA could be suggested as an effective coupling agent to enhance the performance of KNF/LLDPE/PVOH composites.
16 citations
TL;DR: In this paper, the first principles of cubic perovskites SmXO3 (X = Al and Co) for elastic, mechanical and optical properties were studied in the framework of density functional theory.
Abstract: The first-principles study of cubic perovskites SmXO3 (X = Al and Co) for elastic, mechanical and optical properties is done in the framework of density functional theory (DFT). Optimized structura...
10 citations
07 Nov 2018
7 citations
TL;DR: In this article, the effect of cellular microstructure and density of low-density polyethylene (LDPE) foam during compressive deformation were evaluated and the foam cell structure deformation at crosshead was investigated.
Abstract: The effect of cellular microstructure and density of low-density polyethylene (LDPE) foam during the compressive deformation were evaluated Progressive foam cell structure deformation at crosshead
7 citations
TL;DR: In this paper, the degradation behavior of linear low density polyethylene/poly (vinyl alcohol)/kenaf (LLDPE/PVOH/KNF) composites after exposure to different natural weathering durations was investigated.
Abstract: The development of natural fiber polymer composites is increasing worldwide and in some applications, these composites are used at outdoor rendering them exposed to ultra-violet (UV) radiation. The paper investigates the degradation behavior of linear low density polyethylene/poly (vinyl alcohol)/kenaf (LLDPE/PVOH/KNF) composites after exposure to different natural weathering durations. The composites with KNF loadings of 10, 20 and 40 parts per hundred resin (phr) were exposed to natural weathering for 3 months and 6 months, respectively. The weathered composites were characterized by Fourier transform infrared (FTIR) spectroscopy, universal testing machine, field emission scanning electron microscopy (FESEM) and differential scanning calorimetry (DSC). The FTIR analysis showed an obvious carbonyl peak in composites after weathering as an evidence of oxidation. The weight loss percentage of composites increased with respect to exposure duration due to higher absorption of UV irradiation. The tensile properties of weathered composites were lower than that of control composites and these properties also decreased with increasing exposure duration. FESEM micrographs illustrated that composites with longer exposure duration suffered more surface damaged. The crystallinity percentage was found to increase with increasing exposure duration.
6 citations
TL;DR: In this article, the aluminum-based intermetallic compounds AlZr3, AlCu3 and AlCu2Zr are studied for elastic and mechanical properties by a DFT embodied in WIEN2k code with Generalized Gradient Approximation (GGA).
Abstract: The aluminum-based intermetallic compounds AlZr3, AlCu3 and AlCu2Zr are studied for elastic and mechanical properties by a DFT embodied in WIEN2k code with Generalized Gradient Approximation (GGA) ...
5 citations
4 citations
TL;DR: In this article, a thin layer of polycrystalline lead sulfide (PbS) was deposited on a quartz substrate using chemical bath technique, and the aluminum and gold electrodes were deposited on each side of the semiconductor film by thermal evaporation method.
Abstract: Electrical characteristics of semiconductor to metal (S-M) contacts i.e. Schottky contacts, play a vital role towards the performance of the device. The formation of a Schottky contact requires precise thermal treatment, which also affects the electrical characteristic of the junction. In present study, a thin layer of polycrystalline lead sulfide (PbS) was deposited on quartz substrate using chemical bath technique. Metallic electrodes of aluminum and gold were deposited on the each side of the semiconductor film by thermal evaporation method. The aluminum and gold films were 10 nm and 200 nm thick, respectively. Latter, the substrates were thermally treated in air for various durations and the effect of the thermal treatments was evaluated by I-V measurements. It was found that anomalies in the electrical behavior of the S-M contacts were mitigated with the treatments. A change from 0.1 x 10-6A to 0.4 x 10-6A in saturation current was observed. Similarly, the ideality factor (at Vth<
1 citations