Magnetic and dielectric properties of natural rubber and polyurethane composites filled with cobalt ferrite

Hunyek, Anuchit; Sirisathitkul, Chitnarong; Jantaratana, Pongsakorn

doi:10.1179/1743289812y.0000000003

Cited by 9 publications

(6 citation statements)

References 18 publications

(44 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The coercivity of magnetic polymer composites is reduced by the interactions of magnetic clusters in the polymer matrix, in the case of higher loadings or hard magnetic powders [29]. In addition to distribution of magnetic clusters, the experiment demonstrated varying values of coercivity when cobalt ferrite powders were incorporated into different polymers by different methods with varying mechanical stresses [30].…”

Section: Mnal-c/pla Compositesmentioning

confidence: 90%

Effects of Carbon Doping and Annealing Temperature on Magnetic MnAl Powders and MnAl Polymeric Composites

et al. 2021

View full text Add to dashboard Cite

Process parameters leading to magnetic polymer composites, an essential ingredient in the additive manufacturing of rare-earth-free magnets, are investigated. The induction melting of manganese (Mn) and aluminum (Al), and subsequent annealing at 450, 500, or 550 °C for 20 min, gave rise to ferromagnetic τ–MnAl phase, as well as other phases. The nonmagnetic Al4C3 and oxide phases were then removed by the magnetic separation. Magnetic powders from the magnetic separation were incorporated in polylactic acid (PLA) matrix via a solution route. The remanent magnetization as high as 4.3 emu/g in the powder form was reduced to 2.3–2.6 emu/g in the composites. The reduction in coercivity was minimal, and the largest value of 814 Oe was obtained when the powder annealed at 450 °C was loaded in the composite. The phase composition and hence magnetic properties were even more sensitive to the carbon (C) doping. Interestingly, the addition of 3% C led to coercivity as high as 1445 Oe in MnAl–C powders without further annealing. The enhanced coercivity was attributed to the domain wall pinning by the AlMn3C phase, and magnetizations are likely increased by this phase.

show abstract

Section: Mnal-c/pla Compositesmentioning

confidence: 90%

Effects of Carbon Doping and Annealing Temperature on Magnetic MnAl Powders and MnAl Polymeric Composites

et al. 2021

View full text Add to dashboard Cite

show abstract

“…For PU composites, poly[4,4 0 -methylenebis(phenylisocyanate)-alt-1,4 butanediol/di(propylene glycol)/polycaprolactone] beads (Sigma Aldrich) were turned into sheets by milling for 2 min and the milling continued for 12 min after the addition of CoFe 2 O 4 powders. Electromagnetic properties of these composites, referred to as PP-0…PP-45, PU-0…PU-45, NR-0…NR-45, were reported elsewhere [4,5]. Their thermal properties were characterized by means of differential scanning calorimeter (DSC7 Perkin Elmer) for the temperature ranging from 25 to 300°C with a heating rate of 10°C/min.…”

Section: Methodsmentioning

confidence: 99%

“…Incorporation of magnetic fillers into polymeric matrices leads to unique properties which can be implemented in new specific proposes. Based on its magnetic, magnetostrictive, photomagnetic and catalytic properties, the effects of cobalt ferrite (CoFe 2 O 4 ) loading in polypropylene (PP), polyurethane (PU) and natural rubber (NR) were investigated [4,5]. The coercive field remained rather insensitive to the CoFe 2 O 4 loading but the magnetizations were proportional to the loading.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cobalt Ferrite Loading on Differential Scanning Calorimetry of Magnetic Polymer Composites

Khongtong

Hunyek

Sirisathitkul

2015

Proc. Natl. Acad. Sci., India, Sect. A Phys. Sci.

View full text Add to dashboard Cite

Effects of magnetic cobalt ferrite (CoFe 2 O 4 ) on thermal properties of polypropylene (PP), polyurethane (PU) and natural rubber (NR) matrices were studied by differential scanning calorimetry. The endothermic peak area of PP was reduced with increasing loading of CoFe 2 O 4 from 0 to 45 % and such peak in semicrystalline PU was entirely absent when the CoFe 2 O 4 loading was over 25 part per hundred rubber. The results indicated that magnetic clusters embedded at the interchain spacing inhibited the nucleation of order segments in polymer matrix. The presence of CoFe 2 O 4 particles also had influence on the mobile amorphous portions of PU chains with polar functional group. No endothermic evidence on the thermograms of non-polar amorphous NR was observed.

show abstract

“…Reflection loss measurement using Vector Network Analyzer for polyurethane nanocomposites reinforcement with 20% wt nanofillers of natural zeolite and ferric-oxide ratio of 18:2; 16:4; 14:6; 12:8 and 10:10 as a function of frequency in X-band (8)(9)(10)(11)(12) shows in Fig.5 PU nanocomposites with ratio of natural zeolite and ferric-oxide ratio of 12:8 fillers have the optimum reflection loss of -13.2 dB at 11.1 GHz. The reflection loss of less than -10 dB means the microwave absorption more than 90%.…”

Section: Zeolite To Ferric Oxide Ratiomentioning

confidence: 99%

Preparation and Characterization of Microwave-absorption of Sarulla North Sumatra Zeolite and Ferric Oxide-filled Polyurethane Nanocomposites

et al. 2016

View full text Add to dashboard Cite

Microwave-absorptive polymeric composite materials are becoming important to protect interference of any communication sy stems due to the increase in the use of microwave-inducing devices. In this work, the microwave-absorptive polyurethane composites are prepared using natural zeolites of Sarulla North Sumatra and commercial ferric-oxide as fillers. Weight ratio of the natural zeolite to ferric oxide were varied (18:2; 16:4; 14:6; 12:8 and 10:10) by weight. The fillers are prepared using ball milling technique and characterized using Particle Size Analyzer for particle size distribution. The nanocomposites, prepared using in-situ reaction of polyethylene glycol and toluene diisocyanate, is characterized for physical and mechanical properties using tensile strength, thermal properties with TGA techniques, as well as morphological and chemical properties using scanning electron microscopy. Composition and loading of the nanofillers against polyurethane matrices is 20% by weight. Microwave-absorption properties of the nanocomposites is characterized using 8-12 GHz frequency. Tensile strengths of the natural zeolite-ferric oxides polyurethane nanocomposites shows higher values when matrices filled with lower ferric-oxide, which could be due to the nanozeolites have functioned as reinforcement for the polyurethane matrix through polar-polar interaction between the filler surfaces with the matrices. The microwave absorption properties, which investigated by Vector Network Analyzer, of the nanocomposites filled in polyurethane with the ratio of nanozeolite to ferric oxide filler of 12:8 shows reflection loss of -13.2 dB. This condition was observed at 11.1 GHz.

show abstract

Magnetic and dielectric properties of natural rubber and polyurethane composites filled with cobalt ferrite

Cited by 9 publications

References 18 publications

Effects of Carbon Doping and Annealing Temperature on Magnetic MnAl Powders and MnAl Polymeric Composites

Effects of Carbon Doping and Annealing Temperature on Magnetic MnAl Powders and MnAl Polymeric Composites

Effect of Cobalt Ferrite Loading on Differential Scanning Calorimetry of Magnetic Polymer Composites

Preparation and Characterization of Microwave-absorption of Sarulla North Sumatra Zeolite and Ferric Oxide-filled Polyurethane Nanocomposites

Contact Info

Product

Resources

About