Improvement of Dielectric, Magnetic and Thermal Properties of OPEFB Fibre–Polycaprolactone Composite by Adding Ni–Zn Ferrite

Abstract

Abstract:The dielectric and magnetic behaviour and thermal properties of composites based on nickel-zinc ferrite (NZF) filler can be improved by the addition of various types of materials. Amongst others, ferrite-polymer composites have been subjected to a wide range of research, due to their extensive applications: electromagnetic interference shielding, microwave absorption, electrodes and sensors. Currently, the interest in scientific and technical searches for the potential outcomes of ferrite-polymer materials due to their different uses in applications such as telecommunication applications, microwave devices and electromagnetic interference shielding has been growing stronger. The dielectric and magnetic behaviour and thermal properties for such composite materials depend on size, shape and the amount of filler addition. Nickel-zinc ferrite material was prepared using the conventional solid-state reaction technique. This study highlights the development of microwave-absorbing material from NZF by adding natural fibres, Oil Palm Empty Fruit Bunch (OPEFB) and polycaprolactone (PCL). OPEFB is considered in this study because it is a solid waste product of the oil palm milling process which is widely and cheaply available. The use of OPEFB in this product may save the environment from oil palm solid waste. A Thermal Hake blending machine was used in blending the powder structure of NZF + OPEFB + PCL, which made it homogeneous. These composites were characterized by the use of Fourier transform infrared (FTIR) spectrometry and scanning electron microscopy (SEM). The thermal degradation behaviour of the composites was analyzed using thermogravimetric analysis (TGA) and differential thermogravimetric (DTG) thermograms. The effective permittivity and effective permeability was obtained over a broad frequency range from 8 to 12 GHz at room temperature. It was observed that the values of effective permittivity and permeability increased as the content of NZF content increased. A rectangular waveguide connected to a microwave vector network analyser (PNA) (HP/Agilent model PNA E8364B) was employed in measuring the reflection coefficient S 11 and transmission coefficient S 21 parameters of composites for different percentages of NZF filler. This parameter was then used in calculating the microwave absorbing properties (dB).

Complex Permittivity and Microwave Absorption Properties of OPEFB Fiber–Polycaprolactone Composites Filled with Recycled Hematite (α-Fe2O3) Nanoparticles

“…As illustrated in Figure 6, the spectrum for α-Fe 2 O 3 shows characteristic peaks at 507 and 420 cm −1 which can be ascribed to Fe–O stretching/vibrational modes [20]. The pure PCL spectrum indicates characteristic peaks at 727, 1168, 1366, 1720 and 2940 cm −1 consistent with similar studies [12,21]. The spectrum for OPEFB portrays a characteristic absorption band at 3325 cm −1 which could be related to O–H stretching vibration [22].…”

“…Reinforcing materials with OPEFB fiber could reduce cost, improve dielectric loss properties, enhance thermal stability and improve rigidity. OPEFB fiber and ferrites are easily blended with polymers such as polycaprolactone (PCL), as demonstrated in a study by Ahmad et al [12].…”

Synthesis, thermal, dielectric, and microwave reflection loss properties of nickel oxide filler with natural fiber‐reinforced polymer composite

“…A large interfacial area led to a large average polarization; therefore, increase in occurred. Similarly, value increased with for the composites with the filler loading increase . With the NiO filler loading increase, the dipoles number available was also increased, and dipolar polarization enhanced the dielectric properties of the composites.…”

Effect of untreated fiber loading on the thermal, mechanical, dielectric, and microwave absorption properties of polycaprolactone reinforced with oil palm empty fruit bunch biocomposites

“…The filtrated fibers were cleaned with acetone and then oven‐dried to remove the wax layer. A crusher machine was then used to crush the fiber chains into powder, which were subsequently sieved neatly to 250 μm in a laboratory test sieve . The OPEFB + PCL composite was mixed carefully for 20 min with a Thermo Hake blending machine polydrive three‐phase motor set at 1.5 kW, 3.230 V, 40 A and 0–120 rpm drive (Thermo Electron GmbH, Karlsruhe, Germany).…”