Khairul Anwar Abdul Halim
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Preferred name
Khairul Anwar Abdul Halim
Official Name
Abdul Halim, Khairul Anwar
Alternative Name
Halim, Khairul Anwar Abdul
Halim, Khairul Anwar A.
A. Halim, Khairul Anwar
Halim, K. A.Abdul
Anwar Abdul Halim, Khairul
Main Affiliation
Scopus Author ID
57197793640
Researcher ID
AAH-3722-2021

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Network Structure and Mechanical Properties of Flexible Electronic Interconnects based on Linear Low-Density Polyethylene (LLDPE) and Liquid Silicone Rubber (LSR) Conductive Polymer Composites

2024-03-01 , Khairul Anwar Abdul Halim , Mohd Arif Anuar Mohd Salleh , Badrul F. , Azlin Fazlina Osman , Mohd Firdaus Omar , Suhaimi A.S. , Muhammad Salihin Zakaria

Conductive polymer composites (CPCs) with the ability to maintain high conductivity whilst remaining flexible at various operating temperatures and conditions have gained interest as potential materials for electronic interconnect applications. The ability of a polymer matrix to conduct electricity is mainly dependent on the conductive filler loadings as well as the formation of network paths within the CPCs. The main aim of this research work was to establish and understand the correlation between the network structure formation and mechanical properties of linear low-density polyethylene/copper (LLDPE/Cu) and liquid silicone rubber/copper (LSR/Cu) CPCs. Various techniques such as electron microscopy, thermal studies, four-point probe, and tensile testing were employed in this study. Furthermore, selected samples were characterized and tested using synchrotron micro-x-ray fluorescence (XRF) technique and dynamic mechanical analysis (DMA). It was found that the electrical conductivity of the CPCs increased with increasing filler loadings. Addition of Cu filler had a marginal effect on the tensile strength of both LLDPE/Cu and LSR/Cu CPCs. Nevertheless, it was found that the elongation at break for LLDPE/Cu consistently increased with the addition of Cu whereas, for LSR/Cu samples, the elongation at break decreased with the addition of Cu at various loadings. The scanning electron microscopy (SEM) micrographs obtained show that the particles of Cu were closer to one another at higher filler loadings. The data obtained revealed the potential for utilizing CPCs as flexible interconnects suitable for advanced electronic applications.

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Room Temperature Synthesis and Characterization of HKUST-1, Metal–Organic Frameworks (MOFs)

2023-01-01 , Ahmad S. , Mohd Firdaus Omar , Mahdi E.M. , Khairul Anwar Abdul Halim , Shayfull Zamree Abd. Rahim , Sam Sung Ting , Md. Akil H. , Nosbi N.

In the present work, HKUST-1 has been synthesized at room temperature with 1:0, 1:1, and 0:1 ratio of ethanol and water. A wide range of reaction conditions were explored in order to understand the effects of solvent and temperature. It was discovered that various precursors yielded products with various BET specific surface areas. The effect of water may therefore be explained by the decrease in reaction rate with an increasing concentration of reactants. The XRD data and SEM analysis showed that both MOFs were very crystalline in the product.

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The use of ground & ultrasonicated dolomite (GUD) for improving the tensile performance of Poly (ethylene-co-vinyl acetate) copolymer composite

2021-11-12 , Fauzi A.A.A. , Azlin Fazlina Osman , Khairul Anwar Abdul Halim , Mustafa Z. , Alakrach A.M. , Mohd Nazry Salleh

The combination of the organic and inorganic materials to fabricate a new form of material called 'composite' has been performed since several decades ago. However, the strategy to improve the homogeneity of the resultant composite system is still being the main focus of current research. In this study, dolomite and poly (ethylene-co-vinyl acetate) (PEVAc) were employed as filler and matrix, respectively. Dolomite was ground and ultrasonicated before being used as filler. It can be observed that the size of dolomite particles has been reduced significantly upon the grinding and ultrasonication processes. The effect of ground and ultrasonicated dolomite (GUD) addition on the mechanical performance of the PEVAc copolymer was investigated. Results indicate that the GUD filler has successfully increased the tensile strength, elongation at break, modulus of elasticity and tensile toughness of the PEVAc copolymer when being employed in 1 wt%. However, the use of higher content of GUD resulted in the decreasing trend of those properties. This shows that the ground and ultrasonicated dolomite with smaller and higher surface area particles than its pristine form could bring improvement to the mechanical performance of the copolymer when being used in low loading as it can be more easily dispersed in the copolymer matrix.

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MicroMechanical Modeling of PolyaMide 11 nanocoMPosites ProPerties using coMPosite theories

2023-01-01 , Khairul Anwar Abdul Halim , Kennedy J.E. , Mohd Arif Anuar Mohd Salleh , Azlin Fazlina Osman , Mohd Firdaus Omar , Sunar N.M.

The use of organically modified clays as nano-reinforcement in polymer matrices is widely investigated owing to their remarkable reinforcement at low filler loading. In this body of work, the nanocomposites were prepared by melt blending nanoclay with polyamide 11 (PA 11) utilising a twin-screw extruder in order to maximise the dispersion of clay particles within the matrix during compounding. The main aim of the work was to study the reinforcing effect of nanoclay within PA 11 using two micromechanical model namely Halpin-Tsai and Mori-Tanaka composite theories. These theories were used to predict the effective tensile modulus of PA 11 nanocomposites and the results were compared to the experimental data. In addition, the Halpin-Tsai model was used to predict the storage modulus and heat distortion temperature (HDT) of PA 11 nanocomposites. It was found that the tensile modulus for nanocomposites with a high clay aspect ratio exhibits up to 10% higher when compared to the nanocomposites with lower clay aspect ratio. Thus, it is believed that the combination of clay aspect ratio and modulus contributes to the super reinforcing effect of nanoclay within the PA 11 matrix.

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The effect of various nanoclay surface modifications on the thermal and mechanical properties of amorphous polyamide nanocomposites

2020-01-01 , Khairul Anwar Abdul Halim , Kennedy J.E. , Farrell J.B. , Muhammad Salihin Zakaria

The addition of nanoclay within polymer matrix is anticipate to enhance the properties of the polymer system. Nonetheless, one of the key elements in property enhancements of a polymer nanocomposites is the surface modifications of the nanoclay. This is due to the affinity between polymer matrix and nanoclay is of important factors should be considered. In this study, amorphous polyamide was melt blended with different nanoclay grades with different surface modifications in order to evaluate the best clay grade for the polymer system. The thermal analysis carried out on the amorphous polyamide nanocomposites were carried out by means of differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) whereas the mechanical properties were investigated using tensile testing. It was observed that there were changes in the glass transition temperature (Tg) of the nanocomposites due to clay additions. Further, the storage modulus was found to increase as a result of nanoclay incorporation. The type of clay grades significantly affects the mechanical properties of the amorphous polyamide nanocomposites.

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Effect of Al2O3 Nanofillers on Polarization and Depolarization Current (PDC) of New LLDPE/HDPE Compounding for HVDC Application

2022-01-01 , Noor S.M. , Muhamad N.A. , Khairul Anwar Abdul Halim , Ghani S.A. , Darussalam B. , Mohd Jamil M.K.

Polymeric nanocomposites are being used more frequently to replace traditional insulation because they offer superior mechanical and electrical qualities. An efficient and successful diagnostic method based on time domain measurement is Polarization and Depolarization Current (PDC) measurement, which tracks the behaviour of the dielectric. Finding novel materials with improved dielectric properties is one of the key goals of research in the field of polymer nanocomposite dielectrics. This study uses the Polarization and Depolarization Current (PDC) measuring technique to examine the conductivity variation of LLDPE nanocomposite for formulations of HDPE blends nanocomposites made from polyethylene filled with nanoparticles of Al2O3. The goal of the experiment was to determine each sample's individual conductivity fluctuations and PDC pattern. The optimal composition for HV insulation in terms of lowest polarization and depolarization current values and lowest conductivity was discovered to be LLDPE/HDPE- Al2O3at 5%wt of nanofiller. The findings indicate that adding a certain amount of nanofiller to LLDPE/HDPE-based materials improved the materials' dielectric strength.

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