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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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 the effect of electrospinning parameters: voltage and flow rate on PVDF fiber

2023 , Ammar Athallah Budiarto , Sharifah Shahnaz Syed Bakar , Shahrizam Saad , Shuhaida Yahud

Polyvinylidene fluoride (PVDF) is a high purity thermoplastic fluoropolymer and high-capacity polymer that is employed in the electronics, space, and aeronautics industries. Electrospinning parameters have a considerable impact on the morphology, crystallinity, and electrical conductivity of PVDF fiber. Voltage and flow rate are the electrospinning parameters investigated in this study. As a result, the goal of this study is to investigate the effects of various voltages and flow rates on PVDF electrospun fiber. Electrospinning is the simplest and low-cost method to produce PVDF fibers by dissolving PVDF in solvent N, N-Dimethylformamide (DMF). About 15 wt% PVDF solution was used. Electrospinning parameters used were varied applied voltages 15 and 20 kV, flow rates 0.8, 1.0, 1.2, and 1.4 ml/h. Tip-to-collector distance was fixed at 15 cm. Scanning electron microscope (SEM), four-point probe, and X-ray diffraction (XRD) were performed to determine the morphology, electrical conductivity, and crystallinity phase of electrospun PVDF fibers. The SEM analysis concluded that bead formation occurs at higher flow rate and higher voltage. With higher flow rates and lower applied voltage, the fiber's thickness increases. XRD analysis shows that shift peak is observed among all fibers due to short electrospinning time which leads to insufficient thickness of electrospun mat, which affects the mechanical properties of fibers and causes peak shift. Four-point probe analysis concluded that the average conductance increases sharply as flow rate increases and the average resistance decreases. Also, as applied voltage increases, average conductance decreases and the average resistance increases.

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