Thermal behavior and electrical conductivity of ethylene vinyl acetate copolymer/expanded graphite nanocomposites: Effects of nanofiller size and loading

Yousefzade, Omid; Hemmati, Farkhondeh; Garmabi, Hamid; Mahdavi, Mina

doi:10.1002/vnl.21428

Cited by 28 publications

(35 citation statements)

References 27 publications

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“…The observed morphologies for the prepared nanocomposites have been delaminated and intercalated. Intercalation of graphite stacks has been completely obvious in the micrographs of nanocomposites having different loadings of EX100 and EX1500 graphites (refer to [30] for more information). A commercial grade of ethylene vinyl acetate copolymer with 19 wt% vinyl acetate comonomer (VAc) content (Seetec VS430) was purchased from Hyundai Co. (Sosan-gun, South Korea).…”

Section: Experimental Section 21 Materialsmentioning

confidence: 99%

“…Details of solid nanocomposite preparation were presented in our previous study [30]. The aforementioned EGs with different sizes were used to obtain the nanocomposites.…”

Section: Sample Preparationmentioning

confidence: 99%

“…In our previous study [30], the effect of two-step melt mixing process on the dispersion of EG particles in EVA copolymer matrix was investigated. As mentioned, better dispersion state of nanofiller in polymer matrix changes the foam morphology significantly and leads to higher cell density and narrower cell size distribution.…”

Section: Effects Of Eg Particle Sizementioning

confidence: 99%

“…Therefore, larger cells are evident in the samples foamed at higher temperature (Figure 4c and 4d). Details about the melting and crystallization behavior of EVA copolymer in the presence of expanded graphite are presented in a previous study [30].…”

Section: Effects Of Foaming Temperaturementioning

confidence: 99%

“…In addition, dynamic mechanical thermal analysis (DMTA) has emerged as one of the most powerful tools available for viscoelastic property study of plastic materials. Since all polymers are viscoelastic in nature, this analytical method suits perfectly to evaluate the complex phenomena presented by polymeric materials including the main chain and side-groups motions and, in particular, different relaxations of polymer chains [30]. As a result, this turns it into a powerful technique for characterizing different polymer structures such as plastic foams.…”

Section: Introductionmentioning

confidence: 99%

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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: Experimental Section 21 Materialsmentioning

confidence: 99%

“…Details of solid nanocomposite preparation were presented in our previous study [30]. The aforementioned EGs with different sizes were used to obtain the nanocomposites.…”

Section: Sample Preparationmentioning

confidence: 99%

Section: Effects Of Eg Particle Sizementioning

confidence: 99%

Section: Effects Of Foaming Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Compatibilized low‐density polyethylene/linear low‐density polyethylene/nanoclay nanocomposites: II. Opposing effects of nanofiller on quiescent and shear‐induced crystallization

2016

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Isothermal and non-isothermal crystallization processes of polyolefin nanocomposites based on low-density polyethylene/linear low-density polyethylene/nanoclay have been investigated, and the effects of nanoclay loading and dispersion state have been studied. Moreover, the isothermal crystallization of polyethylene chains has been evaluated in the quiescent and shear-induced conditions. In quiescent crystallization, adding 1 wt% nanofiller improves the crystallization rate, whereas an increment in the organoclay loading retards the crystallization process. However, an opposing effect of nanoparticles is observed in the shear-induced crystallization. The findings show that the incorporation of 5 wt% nanoclay in good dispersion state considerably accelerates the shear-induced crystallization process. This influence is found even for very weak shear flow fields. The synergistic effects of nanoclay addition and shear field presence on the crystallization process are of major significance particularly for polyolefin products, which are commonly manufactured by using melt processing methods. K E Y W O R D Sblend, crystallization, nanocomposite, polyethylene, shear

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A correlation between morphology and mechanical performance of injected‐molded PE/EVA/clay nanocomposites: Insight into phase miscibility and interfacial phenomena

Hosseiny

Jafari

Khonakdar

et al. 2020

J of Applied Polymer Sci

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In this study, the correlations between the mechanical performance and structural properties of injected‐molded polyethylene (PE)/ethylene‐vinyl acetate copolymer (EVA)/nanoclay (NC) nanocomposites are investigated by revisiting the interfacial phenomena and miscibility state of the component pairs. The effects of different parameters including the injection molding temperature, mixing sequence in melt‐compounding process, blend composition, and nanoclay loading are studied. A great complexity arises in the filling and cooling process of the injected‐molded parts owing to the phase behavior of the polyolefin blend, crystallization, and morphological changes. The injection molding temperature positively influences the elastic modulus, tensile strength and impact strength of PE/EVA/NC systems through the improvements in the PE/EVA partial miscibility, mutual solubility, and interfacial interactions of PE/clay and PE/EVA pairs. By applying a two‐step mixing process before the injection molding, more nanoclay stacks with smaller thicknesses and larger clay interlayer spacing are formed. The stronger pinning effect of nanoparticles in the second mixing sequence retards the phase separation phenomenon of PE/EVA blend during the cooling stage. As a result of improved mutual PE/EVA solubility, the elastic modulus and tensile strength decrease and the impact resistance increases in the PE‐rich systems. On the other hand, an opposite trend for these properties is found for the EVA‐rich systems.

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Thermal behavior and electrical conductivity of ethylene vinyl acetate copolymer/expanded graphite nanocomposites: Effects of nanofiller size and loading

Cited by 28 publications

References 27 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

Compatibilized low‐density polyethylene/linear low‐density polyethylene/nanoclay nanocomposites: II. Opposing effects of nanofiller on quiescent and shear‐induced crystallization

A correlation between morphology and mechanical performance of injected‐molded PE/EVA/clay nanocomposites: Insight into phase miscibility and interfacial phenomena

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