Infrared Spectroscopy and Thermal Stability Studies of Natural Rubber-Barium Ferrite Composites

Mahmoud, Khaled H.; Makled, M.H.

doi:10.4236/aces.2012.23041

Cited by 13 publications

(6 citation statements)

References 25 publications

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“…The activation energies of the composites were evaluated for the major decomposition only of the polymer matrix component using the Coates and Redfern method (Alwani et al 2013;Mahmoud and Makled 2012), (3) (4) where α is the decomposition fraction, Ea is the activation energy (kJ mol -1 ), R is the gas constant (8.314 JK -1 mol -1 ), T is the absolute temperature in Kelvin (K), A is the preexponential factor (min -1 ), and β is the heating rate (10 °C/min in this study). The Ea values were calculated from the slope (-Ea/R) of the linear plot of ln[(-ln(1-α))/T 2 ] against 1/T.…”

Section: Thermal Degradation and Stabilitymentioning

confidence: 99%

Characterization of Rice Husk-Incorporated Recycled Thermoplastic Blend Composites

Chen¹,

Ahmad²,

Gan³

2016

BioResources

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High-fiber-content composites made from rice husk (RH) (from 50 up to 80 wt%) as well as a recycled thermoplastic blend (rTPB) were fabricated using a two-step extrusion and hot/cold press molding technique. The temperature dependency of the thermal degradation and dynamicmechanical behavior was investigated using thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA). The long-term water absorption and orthotropic swelling were analyzed following immersion in distilled, tap, and sea water for 15 weeks. Improvements in the thermal stability, storage, and loss modulus, as well as reductions in dimensional stability, were observed as the alkali content of the RH in the rTPB composites was increased. The composites immersed in sea water showed the lowest water absorption, followed by those in distilled and then tap water. The thickness dimension of the composite specimens exhibited the highest swelling values, followed by width and then length dimensions. The tensile strength and elastic modulus showed the maximum values at 70 wt% RH (21.2 MPa and 1.6 GPa, respectively). The surface morphology, interfacial adherence, and bonding between the matrix-fiber phases in the composites were characterized using a scanning electron microscope (SEM).

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Section: Thermal Degradation and Stabilitymentioning

confidence: 99%

Characterization of Rice Husk-Incorporated Recycled Thermoplastic Blend Composites

Chen¹,

Ahmad²,

Gan³

2016

BioResources

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“…Among the most widely used magnetic materials belong ferrites. Ferrites are class of technologically important magnetic materials with strong magnetocrystalline anisotropy and high values of magnetic characteristics (mainly coercivity and remanent magnetic induction) [12][13][14][15]. Besides this, they exhibit good chemical stability with a high resistance to solvents, salts, lubricants, alkalis, harmful gases, soft acids, and atmospheric effects, too.…”

Section: Introductionmentioning

confidence: 99%

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

Kruželák

Sykora

Dosoudil

et al. 2016

Advances in Materials Science and Engineering

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Rubber magnetic composites were prepared by incorporation of unmodified and surface modified strontium ferrite into rubber matrices based on NBR and NBR/PVC. Strontium ferrite was dosed to the rubber matrices in concentration scale ranging from 0 to 100 phr. The main goal was to investigate the influence of the type of ferrite on the curing process, physical-mechanical and magnetic properties of composites. The mutual interactions between the filler and rubber matrices were investigated by determination of cross-link density and SEM analysis. The incorporation of magnetic fillers leads to the increase of cross-link density and remanent magnetic induction of composites. Moreover, the improvement of physical-mechanical properties was achieved in dependence on the content of magnetic fillers. Surface modification of ferrite contributed to the enhancement of adhesion on the interphase filler-rubber. It can be stated that ferrite exhibits reinforcing effect in the composite materials and this reinforcing behavior was emphasized with the increase in polarity of the rubber matrix.

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“…Ferrites are a class of technologically important magnetic materials with strong magnetocrystalline anisotropy and high values of magnetic characteristics (mainly coercivity and remanent magnetic induction) [1][2][3]. Besides this, they exhibit good chemical stability with a high resistance to solvents, salts, lubricants, alkalis, harmful gases, soft acids and atmospheric effects too.…”

Section: Introductionmentioning

confidence: 99%

Rubber composites cured with sulphur and peroxide and incorporated with strontium ferrite

et al. 2017

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In the present work, rubber magnetic composites were prepared by incorporation of strontium ferrite into rubber matrices based on natural rubber (NR) and acrylonitrile-butadiene rubber (NBR). Sulphur, peroxide and mixed sulphur/peroxide curing systems were introduced in cross-linking of rubber matrices. The aim was to investigate the influence of curing system composition on physical-mechanical, thermo-physical and magnetic properties of prepared rubber composites and the curing process. Then, the determination of cross-link density and the structure of cross-links were under consideration. The achieved results showed that all investigated parameters were changed depending on the composition of curing system, but also on the type of rubber matrix. While the tensile strength of composites based on NR increased with increasing amount of sulphur in mixed curing systems, in case of composites based on NBR, the highest value of tensile strength reached the value of the sample cured with equivalent ratio of sulphur and peroxide. On the other hand, thermo-physical and magnetic characteristics were found not to be dependent on the curing system composition. The results revealed that not only the composition of curing system, but also the type of rubber matrix plays an important role when preparing the final materials.

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Infrared Spectroscopy and Thermal Stability Studies of Natural Rubber-Barium Ferrite Composites

Cited by 13 publications

References 25 publications

Characterization of Rice Husk-Incorporated Recycled Thermoplastic Blend Composites

Characterization of Rice Husk-Incorporated Recycled Thermoplastic Blend Composites

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

Rubber composites cured with sulphur and peroxide and incorporated with strontium ferrite

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