Ethylene vinyl acetate copolymer (EVA)/multiwalled carbon nanotube (MWCNT) nanocomposite foams

Park, Keun-Wan; Kim, Gue‐Hyun

doi:10.1002/app.29736

Cited by 43 publications

(28 citation statements)

References 28 publications

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“…For EVA copolymer as a thermoplastic matrix, the crosslinking of polymer chains is the best way to increase the melt strength. Therefore, in this study the crosslinking and foaming process of solid nanocomposites were completed in two separate steps, different from other investigations [35][36][37]. First, the chemical crosslinking of EVA copolymer macromolecules was carried out in the compression molding process.…”

Section: Effects Of Eva Crosslinkingmentioning

confidence: 99%

Assisted heterogeneous multinucleation and bubble growth in semicrystalline ethylene-vinyl acetate copolymer/expanded graphite nanocomposite foams: Control of morphology and viscoelastic properties

Yousefzade¹,

Hemmati²,

Garmabi³

et al. 2015

Express Polym. Lett.

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Abstract. Nanocomposite foams of ethylene-vinyl acetate copolymer (EVA) reinforced by expanded graphite (EG) were prepared using supercritical nitrogen in batch foaming process. Effects of EG particle size, crosslinking of EVA chains and foaming temperature on the cell morphology and foam viscoelastic properties were investigated. EG sheet surface interestingly provide multiple heterogeneous nucleation sites for bubbles. This role is considerably intensified by incorporating lower loadings of EG with higher aspect ratio. The amorphous and non-crosslinked domains of EVA matrix constitute denser bubble areas. Higher void fraction and more uniform cell structure is achieved for non-crosslinked EVA/EG nanocomposites foamed at higher temperatures. With regard to the structural variation, the void fraction of foam samples decreases with increasing the EG content. Storage and loss moduli were analyzed to study the viscoelastic properties of nanocomposite foams. Surprisingly, the foaming process of EVA results in a drastic reduction in loss and storage moduli regardless of whether the thermoplastic matrix contains EG nanofiller or not. For the EVA/EG foams with the same composition, the nanocomposite having higher void fraction shows relatively lower loss modulus and more restricted molecular movements. The study findings have verified that the dynamics of polymer chains varies after foaming EVA matrix in the presence of EG.

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Section: Effects Of Eva Crosslinkingmentioning

confidence: 99%

Assisted heterogeneous multinucleation and bubble growth in semicrystalline ethylene-vinyl acetate copolymer/expanded graphite nanocomposite foams: Control of morphology and viscoelastic properties

Yousefzade¹,

Hemmati²,

Garmabi³

et al. 2015

Express Polym. Lett.

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“…[1][2][3] The physical and chemical properties of nanocomposites are different from their bulk counterparts because of the nanometerscale dispersion of reinforcement filler and the high surface to volume ratio. [4][5][6] Poly(ethylene-co-vinyl acetate) polymers have a large commercial impact because of their broad spectrum of practical applications in different fields. The polymer is extensively used in many engineering and industrial areas because of its toughness, and biological inertness, waterproofing, corrosion protection, and packaging of components.…”

Section: Introductionmentioning

confidence: 99%

Fabrication, characterization, and properties of poly(ethylene‐co‐vinyl acetate)/magnetite nanocomposites

Ramesan

2013

J of Applied Polymer Sci

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Poly(ethylene-co-vinyl acetate) (EVA)/magnetite (Fe 3 O 4 ) nanocomposite was prepared with different loading of Fe 3 O 4 nanoparticles. The mixing and compounding were carried out on a two-roll mixing mill and the sheets were prepared in a compressionmolding machine. The effect of loading of nanoparticles in EVA was investigated thoroughly by different characterization technique such as transmission electron microscopy (TEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), limiting oxygen index (LOI), and technological properties. TEM analysis showed the uniform dispersion of filler in the polymer matrix and the dispersion of filler decreased with increase in filler content. XRD of the nanocomposite revealed the more ordered structure of the polymer chain. An appreciable increase in glass transition temperature was observed owing to the restricted mobility of Fe 3 O 4 -filled EVA nanocomposite. TGA and flame resistance studies indicated that the composites attain better thermal and flame resistance than EVA owing to the interaction of filler and polymer segments. Mechanical properties such as tensile strength, tear resistance, and modulus were increased for composites up to 7 phr of filler, which is presumably owing to aggregation of Fe 3 O 4 nanoparticle at higher loading. The presence of Fe 3 O 4 nanoparticles in the polymer matrix reduced the elongation at break and impact strength while improved hardness of the composite than unfilled EVA. The change in technological properties had been correlated with the variation of polymer-filler interaction estimated from the swelling behavior.

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“…The incorporation of nanoparticles in polymeric foams is an effective way to alter the morphology and enhance the properties of foams . Currently, a variety of nanoparticles have been adopted for polymer nanocomposite foams, e.g., clay 9,10, carbon nanofibers (CNFs) 11,12, and multi‐walled carbon nanotubes 13,14. The results showed significant improvement on the performance of the foam materials such as mechanical properties, thermal stability, and others.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of waterborne polyurethane/silver nanocomposite foams

et al. 2018

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Nowadays the waterborne polyurethane (WPU) is a newly developed polymer foam material as a replacement for conventional organic solvent‐based polyurethane (PU). Nevertheless, the WPU foams exhibit some drawbacks such as inferior mechanical strength, low thermal and dimensional stability, which inhibits its large‐scale application at present. So a series of novel WPU/silver nanocomposite foams was successfully prepared by mechanical foaming method. The effect of silver nanoparticles (nano Ag) content on the morphology, thermal behavior, air permeability, water vapor transmission rate (WVT), mechanical, and antibacterial properties of WPU/Ag nanocomposite foams were systematically investigated. The results revealed that the nano Ag were uniformly dispersed in WPU matrix and facilitated cell growth, leading to enhanced mean pore size, thermal stability, air permeability, and WVT value of nanocomposite foams. About 122% improvement in the air permeability and 28% improvement in the WVT value were obtained when the nano Ag content extended from 0 to 4 wt%. It was found that the nano Ag content had great influence on tensile strength and elongation at break. When nano Ag content was 2 wt%, the nanocomposite foam exhibited the maximum tensile strength value of 1.26 MPa. Moreover, because of the addition of nano Ag, the nanocomposite foam showed bacteriostatic rate of 98.23% and 97.38% against Escherichia coli and Staphylococcus aureus, respectively. POLYM. COMPOS., 40:1492–1498, 2019. © 2018 Society of Plastics Engineers

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Ethylene vinyl acetate copolymer (EVA)/multiwalled carbon nanotube (MWCNT) nanocomposite foams

Cited by 43 publications

References 28 publications

Assisted heterogeneous multinucleation and bubble growth in semicrystalline ethylene-vinyl acetate copolymer/expanded graphite nanocomposite foams: Control of morphology and viscoelastic properties

Assisted heterogeneous multinucleation and bubble growth in semicrystalline ethylene-vinyl acetate copolymer/expanded graphite nanocomposite foams: Control of morphology and viscoelastic properties

Fabrication, characterization, and properties of poly(ethylene‐co‐vinyl acetate)/magnetite nanocomposites

Fabrication and characterization of waterborne polyurethane/silver nanocomposite foams

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