Sharifah Shahnaz Syed Bakar
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Preferred name
Sharifah Shahnaz Syed Bakar
Official Name
Sharifah Shahnaz, Syed Bakar
Alternative Name
Bakar, S. S.S.
Bakar, Sharifah Shahnaz Binti Syed
Bakar, SHARIFAH SHAHNAZ Syed
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Scopus Author ID
55560806500

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Effect of graphite dopant in polyvinylidene flouride (PVDF) electrospun composites

2024-12 , Muhammad Zamzuri Mohd Saad , Sharifah Shahnaz Syed Bakar , Shuhaida Yahud , Muhammad Asri Idris , Noorasikin Samat

Polyvinylidene Fluoride (PVDF) is a high purity thermoplastic fluoropolymer that has huge potential, has been employed in numerous electronics, space, and aeronautics industries. The beta-phase of PVDF is the most beneficial due to its superior piezoelectric and pyroelectric properties, which are essential for high-performance applications. Thus, the research on attaining the beta-phase has been critical. PVDF crystallinity could be enhanced by varying processing methods and parameters, including electrospinning. Various researchers have reported on the electrospinning PVDF as a successful route to get beta-phase. The morphology, crystalline phases, and electrical conductivity of PVDF fiber are significantly influenced by electrospinning parameters. In this work, the effect of graphite loading in PVDF is one of the parameters examined. The objective of this work is to investigate the impact of graphite dopant loading on the electrical conductivity of electrospun PVDF composite. The most straightforward and affordable way to create PVDF fibers is by electrospinning. PVDF was first dissolved using N, N-Dimethylformamide (DMF) before mixing with graphite (0.25 wt%, 0.50 wt%, 0.75 wt%, and 1.0 wt%). Each solution was then electrospinned to produce conductive composite fiber. The parameters were fixed at 25 kV voltage; 1.5 ml/h flow rate; and 12 cm tip-to-collector distance. The morphology, electrical conductivity, and crystalline phases of electrospun PVDF fibers were examined using scanning electron microscope (SEM), four-point probe and X-ray diffraction (XRD) machine. As the graphite concentration rises, SEM micrograph showed that more beads were developed along with fiber sizes increment. Short electrospinning times result in insufficient electrospun mat thickness, which affects peak shift, according to XRD examination of all fibers. According to the results of the four-point probe examination, the conductivity rises dramatically and the resistance decreases as the graphite concentration increases.

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Enhancement of electrical conductivity of electrospun polyacrylonitrile fibres using carbon nanomaterials synthesised from polypropylene waste

2020 , Yong Siong Koo , Zhun Yuan Soh , Norzilah Abdul Halif , Sharifah Shahnaz Syed Bakar , Mohd Arif Anuar Mohd Salleh , A.N. Edzatty , Roslan Nur Izzati

Incorporation of carbon nanomaterials (CNMs) into polymer such as Polyacrylonitrile (PAN) fibres allow electric current to pass through easily. Therefore in this study, bulk quantities of CNMs are synthesised using Chemical Vapor Deposition (CVD) method by manipulating the reaction time and catalyst ratio. Polypropylene wastes are used as the carbon precursor and ferrocene as metal catalyst in the CVD experiment. Addition of 1 wt% synthesised-CNMs into electrospun PAN fibres successfully increased the electrical conductivity by 50%. Addition of CNMs improved the crystallinity of electrospun-PAN/CNMs fibres as proven by XRD analysis. Electrospun PAN/CNMs-A fibres show larger diameter than the diameter of electrospun PAN/CNMs-B. Large bead formations contained densely-packed CNMs-A within the structure of electrospun PAN/CNMs-A fibres hindered their effectiveness to conduct the electricity. On the contrary, PAN/CNMs-B shows remarkable improvement in electrical conductivity when loosely-packed CNMs-B are added to the PAN fibres.

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Effect of sintering temperature on the preparation and characterization of green glass ceramic from rice husk ash as a matrix

2020 , Shahrizam Saad , Abdullah Chik , Khairel Rafezi Ahmad , Sharifah Shahnaz Syed Bakar

Powder metallurgy technique were proved successful net-shape technology which suitable for the production of green glass ceramic (GGC) from rice husk ash (RHA) and characterized by good physical and mechanical properties of glass ceramic. In this research, the glass sample was formed by mixing varying percentage of weight of silica, flux and additives. The aim of this work is to study the effect of the sintering temperature to the physical and mechanical properties of GGC. The samples were mixed in different volume fraction of additives which is 5%, 10% and 15% in constant composition of RHA and flux. The mixture was consolidated into rigid die compaction at 300MPa, then sintered at 450, 550 and 750°C. Vickers hardness test were investigated. The glass composite were then characterize by scanning electron microscopy (SEM). The GGC with 10% additives at sintering temperature 550°C shows highest hardness strength which is about 213.0 HV.

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Investigation on the mixing ratio of Dimethylformamide (DMF) and acetone binary solvent on the electrospun Polyvinylidene Fluoride (PVDF) fiber

2023 , Muhamad Haikal Abdullah , Sharifah Shahnaz Syed Bakar , Shuhaida Yahud

Polyvinylidene Fluoride (PVDF) fibers were electrospun from PVDF solution with varied solvent mixing ratios of Dimethylformamide (DMF) and acetone in this work. The goal of this study is to see how the mixing ratio of DMF and acetone as solvent affects the fiber size, crystal structure, and electrical conductivity of PVDF fiber. In weight, the solvent mixing ratios are 100 DMF:0 acetone, 70 DMF:30 acetone, 50 DMF:50 acetone, 30 DMF:70 acetone, and 0 DMF:100 acetone. To be employed in this study, the PVDF solution was fixed at a concentration of 15%. The electrospinning machine parameters were likewise set to 20 kV, 10 cm tip-to-collector distance (TCD), and 1 mL/h flow rate. After the electrospinning process is completed, the sample will be kept for a short period of time in room temperature to allow the fiber to dry before being taken for characterization stages. Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), and Four-Point Probe (FPP) were used to examine the fibers. The fiber size of electrospun PVDF fibers is shown by SEM; the crystal structure of the electrospun PVDF fiber is shown by XRD; and the electrical resistivity of the electrospun PVDF fiber is shown by FPP. According to the results of the experiment, one of the five samples is in powder form, while the other is in fiber form. Two of the four fibers produced contain beads, as determined by SEM. For XRD and FPP characterization, it was discovered that a sample with a high peak intensity of β phase produces the maximum electrical conductivity.

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Investigation on Polyvinyl Chloride (PVC) and Polycaprolactone (PCL) blend ratio: effect on their mechanical and physical properties

2023-07 , Siti Aishah Binti Abd Aziz , Sharifah Shahnaz Syed Bakar , Shuhaida Yahud

The effect of blend ratio for polyvinyl chloride (PVC) and polycaprolactone (PCL) blends on their mechanical and physical properties has been studied in this report. Polymer blends which consists of polyvinyl chloride (PVC) and polycaprolactone (PCL) were prepared by solution casting method with different ratio of PVC/PCL (100/0, 70/30, 50/50, 30/70, 0/100). The tensile and flexural properties of PVC/PCL blends were observed in this work by using universal machine testing. The sample of PVC/PCL blends showed that the tensile and flexural strength of the blend systems increased as the PCL content increased. Hardness test showed that as PCL is absorbed into PVC, the hardness decreased, and this tendency decreased as the amount of PCL is increased. The surface morphology of the PVC/PCL blends was been examined using scanning electron microscopy. The surface morphology resulted that smooth surface can be seen with large pores in the pure PVC while rough surface appeared in the blends due to high content of PCL. The water absorption and density of the PVC/PCL blend is obtained by immersing the sample into the distilled water. The density result showed that the density of blends increased when the content of PCL increased. The water absorption result showed that by increasing the amount of PCL in the blends has decreased the percentage of water absorption.

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