Rubber Composites Based on Polar Elastomers with Incorporated Modified and Unmodified Magnetic Filler

Kruželák, Ján; Sykora, Richard E.; Dosoudil, Rastislav; Hudeč, Ivan

doi:10.1155/2016/7242891

Cited by 12 publications

(9 citation statements)

References 23 publications

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“…The lowest degree of cross-linking of composites filled with ferrite FD8/24 might be then caused by higher particles size of that filler. The similar results were also obtained in our previous work [16], although other research papers did not confirm this presumption [17,18]. Therefore the type of filler and the type of rubber matrix must be also considered and the contribution of magnetic fillers on cross-link density of rubber magnets should be the subject of further investigation.…”

Section: Influence Of Ferrites On Cross-link Density Of Compositessupporting

confidence: 85%

Magnetic Composites Based on Butadiene Rubber and Strontium Ferrites

Kruželák¹,

Hudeč²,

Dosoudil³

2017

MOJPS

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The aim of the work was the study of preparation and properties of rubber magnetic composites based on butadiene rubber (Buna CB 24). Three different types of commercially used strontium ferrites, under the trade name FD8/24, UMBS8 and S90 were applied as magnetic powdery fillers. Besides the rubber and the fillers, the rubber compounds contained only ingredients that support vulcanization process. The study was focused on the preparation of rubber magnetic composites and evaluation of magnetic filler influence on their vulcanization characteristics and cross-link density. Subsequently, the physicalmechanical and magnetic properties were investigated. The results of the study revealed that the incorporation of ferrites into the rubber matrix leads to the preparation of magnetic composites with improved physical-mechanical and magnetic characteristics, which implies that ferrites provide not only suitable magnetic properties to the rubber composites, but also reinforce the rubber matrix.

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Section: Influence Of Ferrites On Cross-link Density Of Compositessupporting

confidence: 85%

Magnetic Composites Based on Butadiene Rubber and Strontium Ferrites

Kruželák¹,

Hudeč²,

Dosoudil³

2017

MOJPS

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“…One can also observe a slight shift toward lower frequencies in the case of polyurethane matrix. The increase in the bandwidth suggests that the polyurethane matrix reinforces the performance of the absorbing material owing to the polar-polar interfacial interactions between the polymeric matrix and the absorbent material [8]. This novel type of dielectric polarization may contribute in increasing the values of double-prime epsilon ε'' responsible for dielectric loss in the material.…”

Section: Microwave Measurementmentioning

confidence: 97%

“…Absorbing fillers could have dielectric or magnetic loss that depends on frequency of the electromagnetic radiation [6,7]. Ferrites are a class of technologically important magnetic materials with interesting magnetic characteristics [8]. NiZn spinel ferrites are the most versatile magnetic materials for general use.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of a flexible microwave absorber based on MnNiZn ferrite (Mn0.1Ni0.45Zn0.45Fe2O4) in a thermoset polyurethane matrix

2020

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In this work, spinel nanoMnNiZn ferrite (Mn 0.1 Ni 0.45 Zn 0.45 Fe 2 O 4) was hosted by a thermoset polyurethane matrix (PU), to produce flexible thin nanocomposite sheets as efficient microwave absorbers. The microwave absorbers of polyurethane nanocomposites were prepared using different loading ratios of MnNiZn ferrite (70%, 75%, and 80wt%). Microwave absorption properties of the nanocomposites were characterized in the range of Sand C-band (2-8 GHz) frequency. Structural and morphological characterizations were performed using X-ray diffractometry (XRD), Fourier-transform infrared spectrophotometer (FTIR), and scanning electron microscopy (SEM). The tensile test was performed to examine the mechanical properties of the molded nanocomposites. The surface hardness was measured using Shore (A) hardness tool. The nanocomposite with 80 wt% loading percent of ferrite in PU at thickness of 5 mm exhibits the best absorption properties and has effective absorption bandwidth (≥ − 10 dB) of 4.28 GHz, with − 29.7 dB minimum reflection loss (RL) at the matching frequency (5.86 GHz) with density of only 2.403 g/cm 3. The experimental results reveal that the microwave absorption properties of the synthesized nanocomposites were improved and reinforced in the case of polyurethane matrix compared to the paraffin wax matrix, through polar-polar interactions and adhesion between the filler and elastomeric matrix depending on their chemical nature. Also, the effect of thermal aging on the performance of the microwave absorption properties of PU-ferrite nanocomposite has been studied. To the best of our knowledge, the use of this cost-effective thermoset polyurethane matrix prepared from PPG, TDI, and castor oil and loaded with ferrite has not been reported before. The effect of polar-polar interactions between the matrix and the ferrite on the microwave absorption characteristics has also been investigated. The high value of reflection loss makes the obtained lightweight and flexible nanocomposite a promising microwave-absorbing material.

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“…The similar results were also obtained in our previous work, 16 although other research papers did not confirm this presumption. 17,18 Therefore the type of filler and the type of rubber matrix must be also considered and the contribution of magnetic fillers on cross-link density of rubber magnets should be the subject of further investigation.…”

Section: Influence Of Ferrites On Cross-link Density Of Compositesmentioning

confidence: 99%

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2017

MOJPS

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Butadiene rubber (BR, Buna CB 24, Lanxess, Germany) was chosen as soft elastomeric matrix for the preparation of rubber magnetic composites. Three types of strontium ferrites were applied as magnetic powdery fillers. Anisotropic strontium ferrite, type FD 8/24, was provided by Magnety, a.s. (Světla Hora u Bruntalu, Czech Republic). Strontium ferrite, commercially marked as UMBS8, was provided by Unimagnet Industry Co., Ltd. (Yhuji City, China). Strontium ferrite, under the trade name S90, was provided by Tridelta GmbH (Hermsdorf, Germany). The amount of ferrite in rubber compounds changed from 0 to 100 phr. Besides the rubber and magnetic fillers, the rubber compounds contained components of vulcanization system (sulphur-1.3 phr, N-cyclohexyl-2-benzothiazolesulfenamide-1.5 phr, ZnO-3 phr, stearin-2phr). IPPD (N-isopropyl-N'-phenyl-p-phenylenediamine) was introduced into rubber compounds as an antioxidant. Methods Evaluation of structural characteristics of strontium ferrites: The specific surface area and total porosity of strontium ferrites were determined by applying the method of mercury porosimetry. The measurement was carried out by using Porosimeter 1500 (Carlo Erba, Milan, Italy). Maximum press of mercury 150MPa enables to determine pores up to the size of 5nm. Particle size distribution of tested fillers was investigated by using Cilas 1064L appliance (Cilas, France). Fine particles are measured by scanning of scattering reflection, which is formed by examined sample. The time of detection is 20 seconds in liquid state. Measuring is performed in the range of attenuation of

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Rubber Composites Based on Polar Elastomers with Incorporated Modified and Unmodified Magnetic Filler

Cited by 12 publications

References 23 publications

Magnetic Composites Based on Butadiene Rubber and Strontium Ferrites

Magnetic Composites Based on Butadiene Rubber and Strontium Ferrites

Preparation and characterization of a flexible microwave absorber based on MnNiZn ferrite (Mn0.1Ni0.45Zn0.45Fe2O4) in a thermoset polyurethane matrix

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