Preparation and characterization of flexible polyurethane foam nanocomposites reinforced by magnetic core-shell Fe3O4@APTS nanoparticles

Nikje, Mir Mohammad Alavi; Moghaddam, Sahebeh Tamaddoni; Noruzian, Maede; Nejad, Mohammad Amin Farahmand; Shabani, Keyvan; Haghshenas, Moslem; Shakhesi, Saeed

doi:10.1007/s00396-013-3099-2

Cited by 24 publications

(20 citation statements)

References 19 publications

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“…Espumas de PU podem ser classificadas como rígidas ou flexíveis, ou ainda, espumas de células abertas, quando as paredes de suas células são rompidas permitindo sua interligação por meio de poros, ou células fechadas, quando não há comunicação entre as células e o gás formado para expansão fica aprisionado em seu interior [1,4] . Entre as aplicações mais comuns de espumas flexíveis de PU, destacam-se: bancos de automóveis, colchões, travesseiros, móveis, embalagens, calçados, etc., por possuírem boa capacidade de amortecimento de impacto, flexibilidade, durabilidade e facilidade de moldagem entre outros [5][6][7][8][9] .…”

Section: Introductionunclassified

Obtenção de espumas flexíveis de poliuretano com celulose de Pinus elliottii

et al. 2017

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ResumoNeste trabalho foram desenvolvidas espumas flexíveis de poliuretano com a adição de celulose de Pinus nas concentrações de 0,5; 1 e 2% (m/m). A celulose foi submetida ao processo de fibrilação mecânica e posterior secagem por aspersão (spray dry) sendo caracterizada quanto a sua morfologia por MEV e MET. As espumas foram produzidas pelo método de batelada (one-shot) com a adição e mistura da fibra junto ao poliol. As espumas foram caracterizadas por MEV, densidade aparente e resistência à compressão. Os principais resultados indicam que a fibrilação mecânica promove a obtenção de fibras em escala nanométrica, porém durante a secagem, ocorre aglomeração ocasionando aumento para escala micrométrica. As propriedades mecânicas da espuma obtiveram acréscimos de 40 e 50% na resistência à compressão com a adição de 0,5 e 1% de celulose, respectivamente, evidenciando seu potencial como aditivo alternativo para o desenvolvimento de espumas de poliuretano. Palavras-chave: celulose, espuma, fibrilação, poliuretano, spray dry. AbstractIn this work, flexible polyurethane foams were developed with the addition of Pinus cellulose at concentrations of 0.5; 1 and 2 wt%. The cellulose was subjected to mechanical fibrillation process and subsequent dried by spray dry process. It was characterized morphologically by SEM and TEM. The foams were produced by one-shot method by adding and mixing the fiber with the polyol. The foams were characterized by SEM, apparent density and compression strength. The main results indicate that the mechanical fibrillation promotes the obtainment of nanoscale fibers, but during the drying process, agglomeration occurs causing an increase reaching the micrometer scale. The mechanical properties of the foam increased by 40 and 50% in compressive strength with the addition of 0.5% and 1% of cellulose, respectively, showing its potential as an alternative additive for the development of polyurethane foams.

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Section: Introductionunclassified

Obtenção de espumas flexíveis de poliuretano com celulose de Pinus elliottii

et al. 2017

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“…Figure , shows ATR results of pure pristine PU and its magnetic nanocomposites with different amount of core‐shell nanoparticles. As shown in the figure, the stretching vibration at 1096 cm −1 are belonging to the CO bond . The absorption band at 1540 cm −1 is due to NH deformation vibration and CN bond.…”

Section: Resultsmentioning

confidence: 91%

“…In the other words, cell density is controlled by the competitive process between the cell nucleation, its growth, and coalescence (Table ). In addition, MNPs act as nucleation site to aid the bubble nucleation process during cell formation …”

Section: Resultsmentioning

confidence: 99%

“…Nanoparticulated polyol was hand mixed with MDI in 400 mL paper cup at 10:6 polyol/MDI weight ratios based on the mass of the components. Finally the samples were kept in at room temperature for 24 h for curing and future testing . The scheme of the formation of PU flexible foam nanocomposites is shown in Scheme .…”

Section: Methodsmentioning

confidence: 99%

“…This finding has other potential applications such as thermal and acoustic insulation, etc . Surface modification of pristine MNPs is employed to enhance the performance of nanoparticles and increase the interaction between MNPs and PU matrix . Recently, Mohammadi et al prepared magnetic PU rigid elastomer nanocomposites by incorporating pure‐ and thiodiglycolic acid (TDGA) surface modified Fe 3 O 4 NPs into a PU rigid matrix by in situ polymerization method.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Novel Magnetic Polyurethane Flexible Foam Nanocomposites

Moghaddam

Naimi-Jamal

2017

Macromolecular Symposia

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Novel magnetic polyurethane flexible foam nanocomposites were synthesized by incorporation of modified magnetic iron oxide nanoparticles into polyurethane flexible foam. Core shell magnetic nanoparticles (MNPs) Fe3O4@SiO2 were synthesized via co‐precipitation and sol‐gel methods and incorporated in the structure of the composites by in‐situ polymerization of monomers in the presence of MNPs. The magnetic core‐shell NPs were used up to 3.0% in the foam formulation and the optimum percentage was defined. The prepared nanocomposites were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT‐IR), vibrating sample magnetometery (VSM), thermo‐mechanical analysis (TMA), and thermogravimetric analysis (TGA). The thermogravimetric analysis results showed an increased thermal stability of the polyurethane flexible foam nanocomposites by incorporation of magnetic core shell nanoparticles.

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Magnetic foams from polyurethane and magnetite applied as attenuators of electromagnetic radiation in X band

Silva

Pereira

Silva

et al. 2020

J of Applied Polymer Sci

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In this work, electromagnetic radiation absorbent materials (ERAM) were prepared from expanded polyurethane and nano-Fe3O4. The effect of porosity and charge content on the attenuation of incident radiation was investigated using helium gas pycnometry and the waveguide technique in the frequency range of 8 to 12 GHz (X-band). ERAM were also characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and vibration sample magnetometer (VSM). Pure polyurethane absorbed 93.6% of the incident radiation at 11.8GHz. This result was attributed to its porous structure and low porosity. Although the

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Preparation and characterization of flexible polyurethane foam nanocomposites reinforced by magnetic core-shell Fe3O4@APTS nanoparticles

Cited by 24 publications

References 19 publications

Obtenção de espumas flexíveis de poliuretano com celulose de Pinus elliottii

Obtenção de espumas flexíveis de poliuretano com celulose de Pinus elliottii

Preparation of Novel Magnetic Polyurethane Flexible Foam Nanocomposites

Magnetic foams from polyurethane and magnetite applied as attenuators of electromagnetic radiation in X band

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