Shear and extensional rheology of EVA/layered silicate-nanocomposites

Gupta, Rahul; Pasanovic-Zujo, V.; Bhattacharya, S. N.

doi:10.1016/j.jnnfm.2005.05.002

Cited by 92 publications

(63 citation statements)

References 28 publications

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“…The rheological behaviour of molten bio-nanocomposites complements XRD and TEM information on the degree of exfoliation of clay platelets in a polymer matrix [30]. Fig.…”

Section: Composites Characterizationmentioning

confidence: 91%

“…The high viscosity at low shear rates points to strong interactions between the delaminated clay platelets and the polymer chains or, alternatively, the formation of network structures by clay particle interactions. Pronounced shear thinning indicates extensive clay exfoliation in a given system [30][31][32]. The nanocomposites internal structure is retained at low shear rates but at high shear rates the clay network structures break down and the platelets tend to orient in the flow direction.…”

Section: Composites Characterizationmentioning

confidence: 99%

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Surfactant-free dimer fatty acid polyamide/montmorillonite bio-nanocomposites

Macheca

Gnanasekaran²,

Focke³

2013

Colloid Polym Sci

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Polyamide bio-nanocomposites were successfully prepared using a surfactant-free approach. The clay morphology was fixed by dispersing the ammonium ion-exchanged clay in acetic acid. This was mixed wi th an aceti c aci d sol uti on of the polyamide and the composite was recovered by precipitation with water. The composites featured a mixed morphology containing some exfoliated clay sheets together with nano-sized clay tactoids.Bio-nanocomposites containing as much as 27.5 wt.% clay were obtained. At this filler level, and depending on the temperature, the modulus was up to nine times higher than that of the parent polymer. Addition of clay also increased the glass transition temperature by as much as 5°C. This indicates that the high interfacial surface area, presented by the clay platelets dispersed in the matrix, significantly impaired the polymer chain mobility.

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“…The rheological behaviour of molten bio-nanocomposites complements XRD and TEM information on the degree of exfoliation of clay platelets in a polymer matrix [30]. Fig.…”

Section: Composites Characterizationmentioning

confidence: 91%

Section: Composites Characterizationmentioning

confidence: 99%

Surfactant-free dimer fatty acid polyamide/montmorillonite bio-nanocomposites

Macheca

Gnanasekaran²,

Focke³

2013

Colloid Polym Sci

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“…On the other hand, when polymer-filler interaction is the driving factor, the viscoelasticity of the melt is controlled by the dynamics of the stick-slip motion of the polymer chains around the filler surface [17][18][19][20][21][22]. During the past few years, the linear viscoelastic behaviour in the molten state of polymer nanocomposites filled with organically modified clays has been widely investigated [23][24][25][26][27][28][29][30][31], and the subject has been reviewed by Krishnamoorti and Yurekli [26]. Studying the rheological response of polystyrene/clay nanocomposites, Zhao et al [30] found that the level of dispersion was markedly correlated with the rheological response.…”

Section: Introductionmentioning

confidence: 99%

“…Studying the rheological response of polystyrene/clay nanocomposites, Zhao et al [30] found that the level of dispersion was markedly correlated with the rheological response. Gupta et al [25] prepared a series of ethylene-vinyl acetate/ clay nanocomposites, finding a marked shear thinning behaviour with respect to the unfilled sample at filler loadings higher than 2.5 wt%. Wu et al [29] prepared polylactide/clay nanocomposites by melt mixing, revealing the formation of a solid-like behaviour for clay loadings higher than 4 wt%, taken as the percolation threshold for the formation of a physical network.…”

Section: Introductionmentioning

confidence: 99%

Linear low-density polyethylene/silica micro- and nanocomposites: dynamic rheological measurements and modelling

Dorigato¹,

Pegoretti²,

Penati³

2010

Express Polym. Lett.

106

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Abstract. Linear low-density polyethylene (LLDPE) based composites were prepared by melt compounding with 1, 2, 3 and 4 vol% of various kinds of amorphous silicon dioxide (SiO2) micro-and nanoparticles. Dynamic rheological tests in parallel plate configuration were conducted in order to detect the role of the filler morphology on the rheological behaviour of the resulting micro-and nanocomposites. A strong dependence of the rheological parameters from the filler surface area was highlighted, with a remarkable enhancement of the storage shear modulus (G′) and of the viscosity (η) in fumed silica nanocomposites and in precipitated silica microcomposites, while glass microbeads only marginally affected the rheological properties of the LLDPE matrix. This result was explained considering the formation of a network structure arising from particle-particle interactions due to hydrogen bonding between silanol groups. A detailed analysis of the solid like behaviour for the filled samples at low frequencies was conducted by fitting viscosity data with a new model, based on a modification of the original De Kee-Turcotte expression performed in order to reach a better modelling of the high-frequency region.

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“…Previous studies have indicated that the melt-state linear rheology in polymer nanocomposites is dominated by the mesoscale dispersion of the nanoparticles and the strength of the interactions between the nanoparticles and the polymer matrix. [4][5][6][7][8] For the case of the single endfunctionalized polymers, bridging between nanoparticles via long-lived physisorbed configurations is not possible for weakly interacting polymers, such as polyolefins, and at best entanglement induced bridging interactions might occur. 4,9,10 The PP-g-MA based nanocomposites differ qualitatively from nanocomposites based on polymers that exhibit strong interactions with the nanoparticles, such as end-tethered polyamide-6/montmorillonite nanocomposites 4,[9][10][11][12] and poly(vinyl alcohol)/ montmorillonite nanocomposites; 13 in these latter hybrids, each monomer repeat-unit along the polymer has strong attractive interactions with the nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Tailored Nanocomposites of Polypropylene with Layered Silicates

Nakajima

Manias

et al. 2009

Macromolecules

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The melt rheological properties of layered silicate nanocomposites with maleic anhydride (MA) functionalized polypropylene are contrasted to those based on ammonium-terminated polypropylene. While the MA functionalized PP based nanocomposites exhibit solid-like linear viscoelastic behavior, consistent with the formation of a long-lived percolated nanoparticle network, the single-end ammonium functionalized PP based nanocomposites demonstrated liquid-like behavior at comparable montmorillonite concentrations. The differences in the linear viscoelasticity are attributed to the presence of bridging interactions in MA functionalized nanocomposites. Further, the transient shear stress of the MA functionalized nanocomposites in start-up of steady shear is a function of the shear strain alone, and the steady shear response is consistent with that of non-Brownian systems. The weak dependence of the steady first normal stress difference on the steady shear stress suggests that the polymer chain mediated silicate network contributes to such unique flow behavior.

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Shear and extensional rheology of EVA/layered silicate-nanocomposites

Cited by 92 publications

References 28 publications

Surfactant-free dimer fatty acid polyamide/montmorillonite bio-nanocomposites

Surfactant-free dimer fatty acid polyamide/montmorillonite bio-nanocomposites

Linear low-density polyethylene/silica micro- and nanocomposites: dynamic rheological measurements and modelling

Tailored Nanocomposites of Polypropylene with Layered Silicates

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