Nik Noriman Zulkepli
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Nik Noriman Zulkepli
Official Name
Nik Noriman , Zulkepli
Alternative Name
Zulkepli, N. N.
Noriman, Nik Zulkepli
Noriman, N. Z.
Zulkepli, Nik N.
Zulkepli, Nik Noriman
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Scopus Author ID
55898485400
Researcher ID
J-6410-2015

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Now showing 1 - 10 of 18
  • Publication
    Flexural and morphology properties of rHDPE/BF composites: effect of surface modification of bamboo filler by NaOH treatment
    (AIP Publishing, 2020)
    Aini Asifa Ahmad Kamal
    ;
    Nik Noriman Zulkepli
    ;
    Sam Sung Ting
    ;
    Rosniza Hamzah
    ;
    Omar S. Dahham
    ;
    N. A. Latip
    ;
    M. U. Umar
    This study is about the effect of alkaline treatment on bamboo filler reinforced with recycle high density polyethylene (rHDPE) composites. The alkaline treatment was done by sodium hydroxide (NaOH) at three different concentrations (2.5 wt.%, 5.0 wt.% and 7.5 wt.%) for two hours at room temperature. The bamboo filler and rHDPE was compound with the extrusion method and the granule was form. The granule of rHDPE/bamboo filler composites was inject by using injection molding to produce the sample of end product. The samples of rHDPE/bamboo filler was tested using conventional universal testing machine. Field emission electron microscopy (FESEM) was used to analyze the morphology of filler and Fourier Transform Infrared Spectroscopy (FTIR) for characterization of functional group in the filler and composites. The result showed that the flexural properties of rHDPE/bamboo filler composites were slightly affected by the alkaline treatment on the bamboo filler.
  • Publication
    Copper alloy reinforced by graphene by powder metallurgy technique
    (AIP Publishing, 2020)
    M. Yusoff
    ;
    Mohamad M.
    ;
    M. B. Abu Bakar
    ;
    M. N. Masri
    ;
    Nik Noriman Zulkepli
    ;
    Omar S. Dahham
    ;
    M. U. Umar
    In this study, the effect of milling speed and compaction pressure on the densification and morphology of CuZn-Gr composite was evaluated. The composite was prepared by using powder metallurgy technique. The effect of the microstructural and compaction were determined based on different milling speed in thus research. The different milling speeds that involved were 175 rpm, 200 rpm, 225 rpm, and 250 rpm. Meanwhile, the different compaction pressures that used in this study were 127.53, 250, 374.67, and 500 MPa. The properties of the milled powder gave the result to green density and densification parameter. The peak XRD of Cu and Zn broadened as milling time increased. The milled powder at 250 rpm has lowest crystallite size and highest internal strain. As the milling speed is increase, the pattern of powder mixture diminished and become smaller due to the well homogenizing powders during milling. Besides, after compaction, 200 rpm and 250 rpm have optimum green density and densification parameter with increasing compaction pressure.
  • Publication
    Current method on spalling repair work in ages building
    (AIP Publishing, 2020)
    N. A. Latip
    ;
    M. U. Umar
    ;
    Nik Noriman Zulkepli
    ;
    Izwan Johari
    ;
    Omar S. Dahham
    ;
    Rosniza Hamzah
    ;
    Shahrizal Nazri
  • Publication
    Mechanical and physical properties of non-woven kenaf fibre mat reinforced polypropylene composites prepared by compression molding
    (AIP Publishing, 2020)
    N. H. Lokman
    ;
    M. B. Abu Bakar
    ;
    Nik Noriman Zulkepli
    ;
    M. N. Masri
    ;
    Mohamed Mazlan
    ;
    Omar S. Dahham
    ;
    M. U. Umar
    In this research, the non-woven kenaf fibre mat reinforced polypropylene composites (NWKFMRPP) were fabricated by the compression moulding method with different layers of kenaf fibre (KF) mat. The pure polypropylene (PP) matrix was used to prepare the composites to serve as control. Two types of maleic anhydride grafted polypropylene (MAPP) coupling agent which is MAPP1 (Polybond 3200) and MAPP2 (Orevac CA100) also have been used to enhance the adhesion between fibre and matrix. Fourier transform infrared (FTIR) spectroscopy was used to characterize the chemical constituents in pure PP and the NWKFMRPP composites. Then, tensile and flexural test were used to determine the mechanical properties by using a universal testing machine (UTM). Water absorption and thickness swelling test were also been carried out to reveal the physical properties of pure PP and NWKFMRPP composites. Overall, the result shows that the increment in KF layers has given a significant improvement in modulus properties but at the expense of strength properties. Besides, the percentage of water absorption increased when the layer of KF increased. However, the presence of both MAPP1 and MAPP2 coupling agents successfully enhanced its mechanical and water absorption properties as a result of the improvement of the fibre-matrix adhesion between the KF and PP matrix.
  • Publication
    Effect of chemical treatment on mechanical and physical properties of non-woven kenaf fiber mat reinforced polypropylene biocomposites
    (AIP Publishing, 2020)
    M. N. I. Mohd Sabri
    ;
    M. B. Abu Bakar
    ;
    M. N. Masri
    ;
    Mohamad Mazlan
    ;
    Nik Noriman Zulkepli
    ;
    Omar S. Dahham
    ;
    M. U. Umar
    Kenaf fibre mat (KFM) reinforced polypropylene (PP) biocomposites have been prepared using sandwich structure and hot press moulding technique. To enhance the interfacial bonding between PP and kenaf fibre, KFM was chemically treated with two different chemicals which are 5% hydrogen peroxide and 2% silane. Fourier transform infrared (FTIR) was used to characterize the chemical constituents in both treated and untreated kenaf fibres. Universal tensile machine (UTM) was used to determine mechanical properties (tensile and flexural strength, tensile and flexural modulus) of both treated and untreated KFM-PP biocomposites. Water absorption test was also conducted in order to evaluate its water-resistance performance. The result shows that peroxide treatment demonstrated the highest performance in mechanical and water absorption properties compared to other chemical treatment. SEM morphological studies proved that almost all treated KFM showing good fibre-matrix interfacial adhesion which less fibre pull out, void and and small interface gap. Thus, the chemical treatment on KFM improved fibre-matrix adhesion, which also contributed to the enhancement of mechanical properties and physical properties compared to untreated KFM reinforced PP biocomposites.
  • Publication
    The effects of different bamboo filler loading on HDPE/BF composites and rHDPE/BF composites: flexural and morphology
    (AIP Publishing, 2020)
    Aini Asifa Ahmad Kamal
    ;
    Nik Noriman Zulkepli
    ;
    Sam Sung Ting
    ;
    Rosniza Hamzah
    ;
    Omar S. Dahham
    ;
    M. U. Umar
    ;
    Izwan Johari
    In this article, wood plastic composite (WPC) is a composite material made up from bamboo as filler (BF) and high-density polyethylene and recycle high density polyethylene (HDPE) plastic as matrix. This research was conducted in order to investigate the mechanical properties of HDPE/BF and rHDPE/BF composites with different filler loading (5 wt.%, 10 wt.%, 15 wt.% and 20 wt.%). From the morphology test by using Field Emission Scanning Electron Microscopy (FESEM), the bonding between filler and matrix to 10 wt.% show a positive effect and have a great bonding. The, Fourier Transform Infrared Spectroscopy (FTIR) used to analyze the functional group in the bamboo filler which contain lignin, cellulose and hemicellulose. The flexural test was conducted to study the mechanical properties of rHDPE/BF composites. Based on the flexural test result, the HDPE/BF and rHDPE/BF composites with 10 wt.% BF show the highest flexural result as decreasing filler loading will reduce the strength of the composites.
  • Publication
    Sawdust short fiber reinforced epoxidized natural rubber: insight on its mechanical, physical, and thermal aspects
    (Tech Science Press, 2020)
    O. S. Dahham
    ;
    Nik Noriman Zulkepli
    ;
    Haliza Jaya
    ;
    Rosniza Hamzah
    ;
    M. U. Umar
    ;
    I. Johari
    In this work, Epoxidized natural rubber/sawdust short fiber (ENR-50/ SD) composites at different fiber content (5, 10, 15 and 20 phr) and size (fine size at 60–100 μm and coarse size at 10–20 mm) were prepared using two-roll mill and electrical-hydraulic hot press machine respectively. Curing characteristics, water uptake, tensile, morphological, physical, and thermal properties of the composites were investigated. Results indicated that the scorch time and cure time became shorter whereas torque improved as SD content increase. Though the decline of tensile strength and elongation at break values, modulus, hardness and crosslinking density have shown enhancements with the increasing of SD content. The water uptake percentage of all samples has shown an increasing as SD content increase. However, the low SD content, particularly fine size have presented lower water uptake. The temperature of weight% loss (5 and 50 wt% loss) of 5 phr SD (low content) have recorded higher temperature compared to 20 phr SD (high content) in the rubber composites, which indicated higher thermal stability. The fine size of SD has recorded better overall properties than SD coarse size at same loading in the rubber composites.
  • Publication
    Surface modification of bamboo filler by acid treatment on flexural and morphology rHDPE/BF composites
    (AIP Publishing, 2020)
    Aini Asifa Ahmad Kamal
    ;
    Nik Noriman Zulkepli
    ;
    Sam Sung Ting
    ;
    Rosniza Hamzah
    ;
    Omar S. Dahham
    ;
    M. U. Umar
    ;
    Izwan Johari
    This study main objective is to compare the effect of different concentration on surface treatments of natural fibrous material, bamboo filler (BF) by using acetic acid (CH3COOH). The application of surface treatment on natural fibrous material can improve the compatibility with polymer matrix material. Different concentration on surface treatment by using CH3COOH were applied at 0 wt.%, 2.5 wt.%, 5.0 wt.% and 7.5 wt.%. After the application of surface treatments, the fibrous materials were combined with polymer matrix material, particularly recycled high density polyethylene (rHDPE), by twin screw extruder and injection moulding. The mechanical test was performed to evaluate the influence of different concentration of surface treatments on rHDPE/BF composites. The experimental results shows that the surface treatment by using CH3COOH on BF strongly affect the mechanical properties of the final composite materials by increasing the flexural strength ultimately at 5.0 wt.% concentration CH3COOH with the highest flexural strength. The morphology of treated BF by using Field Emission Scanning Electron Microscope (FESEM) show that the lignin, wax and other impurities was removed from BF.
      9  1
  • Publication
    Influence of filler surface modification on static and dynamic mechanical responses of rice husk reinforced linear low-density polyethylene composites
    ( 2021)
    Mohd Firdaus Omar
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Sam Sung Ting
    ;
    B. Jeż
    ;
    M. Nabiałek
    ;
    Hazizan Md Akil
    ;
    Nik Noriman Zulkepli
    ;
    Shayfull Zamree Abd. Rahim
    ;
    Azida Azmi
    Filler surface modification has become an essential approach to improve the compatibility problem between natural fillers and polymer matrices. However, there is limited work that concerns on this particular effect under dynamic loading conditions. Therefore, in this study, both untreated and treated low linear density polyethylene/rice husk composites were tested under static (0.001 s–1, 0.01 s–1 and 0.1 s–1) and dynamic loading rates (650 s–1, 900 s–1 and 1100 s–1) using universal testing machine and split Hopkinson pressure bar equipment, respectively. Rice husk filler was modified using silane coupling agents at four different concentrations (1, 3, 5 and 7% weight percentage of silane) at room temperature. This surface modification was experimentally proven by Fourier transform infrared and Field emission scanning electron microscopy. Results show that strength properties, stiffness properties and yield behaviour of treated composites were higher than untreated composites. Among the treated composites, the 5% silane weight percentage composite shows the optimum mechanical properties. Besides, the rate of sensitivity of both untreated and treated composites also shows great dependency on strain rate sensitivity with increasing strain rate. On the other hand, the thermal activation volume shows contrary trend. For fracture surface analysis, the results show that the treated LLDPE/RH composites experienced less permanent deformation as compared to untreated LLDPE/RH composites. Besides, at dynamic loading, the fracture surface analysis of the treated composites showed good attachment between RH and LLDPE.
      1  16
  • Publication
    The effect of titanium dioxide to enhance physical properties of coconut shell reinforced unsaturated polyester composites
    (AIP Publishing, 2020)
    N. Shahidan
    ;
    M. B. Abu Bakar
    ;
    M. N. Masri
    ;
    M. Mazlan
    ;
    Nik Noriman Zulkepli
    ;
    S. Dahham Omar
    ;
    M. U. Umar
    This study aims to characterize the physical properties of kenaf fibre mat (KFM) reinforced unsaturated polyester (UPE) composites by introducing graphene as nano filler. The composites were prepared by using hand lay-up and compression moulding techniques. To improve the interfacial adhesion between fibre and matrix, the KFM was chemically treated with alkaline treatment (NaOH) and silane. Fourier transform infrared (FTIR) was used to investigate the changes of fibres chemical constituents after treatment. To further enhance the strength and stiffness properties, graphene at three different percentages (0.5, 1.0 and 1.5%) was also formulated into KFM reinforced UPE composites. Physical (water absorption) tests were carried out to study and compare that properties of untreated and alkaline treated KFM-UPE as well as the presence of graphene in the composites. The result showed that the introduction of both silane and alkalized KFM significantly enhanced the mechanical and physical properties of UPE composites. On the other hand, the presence of graphene showed tremendous enhancement in physical properties of KFM-UPE composites. The morphological analysis of the rupture surface of samples has demonstrated the improvement in fibre/matrix interfacial adhesion after chemical treatment and addition of graphene, respectively.
      13  1