Rheological properties of suspensions of TiO2 particles in polymer solutions. 1. Shear viscosity

Harzallah, Omar; Dupuis, Dominique

doi:10.1007/s00397-002-0250-2

Cited by 40 publications

(22 citation statements)

References 26 publications

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“…It is confirmed experimentally that while keeping con stant solid volume fraction and shear rate imposed, the viscosity of suspension increases with the increase of the clusters size [18][19][20]. Direct microscopic observa tions of clusters performed in [21] during the viscosity measurements also confirmed this tendency.…”

Section: Clustering and Viscosity Of Concentrated Suspensionssupporting

confidence: 54%

“…Thus the thixotropic behaviour should be expected for floccu lated suspensions [9]. Indeed, thyxotropy has been observed in experimental studies on rheology of floc culated suspensions [18,20].…”

Section: Clustering and Viscosity Of Concentrated Suspensionsmentioning

confidence: 88%

“…That is why the Dougherty-Krieger equation (3) can be applied to fit experimental data on the viscosity of flocculated suspensions with γ being now the effective solid volume fraction [7,22]. Otherwise the concept of the effective maximum solid volume fraction can be used [18,19].…”

Section: Clustering and Viscosity Of Concentrated Suspensionsmentioning

confidence: 99%

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Aggregation in colloidal suspensions and its influence on the suspension viscosity

et al. 2010

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Section: Clustering and Viscosity Of Concentrated Suspensionssupporting

confidence: 54%

Section: Clustering and Viscosity Of Concentrated Suspensionsmentioning

confidence: 88%

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Aggregation in colloidal suspensions and its influence on the suspension viscosity

et al. 2010

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“…The reduction of the filler size down to nanometric scale can produce substantial differences in the rheology and dynamic of filled polymer in comparison to micron sized particles [2][3][4][5][6][7]. In fact, polymer composites reinforced with submicron fillers generally show significant enhancements in the viscoelastic properties compared to microcomposites at similar filler contents, associated to the appearance of a secondary plateau for the dynamic storage modulus (G′) in the low frequency regime [3,[6][7][8][9][10].…”

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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“…Reduction of the filler size to the order of nanometers can lead to substantial differences in rheology and dynamics of filled polymer liquids compared to complex fluids, reinforced with micron sized particles [14][15][16][17][18][19]. In particular, polymer composites reinforced with sub-micron fillers, often referred to as polymer nanocomposites, exhibit a significant enhancement in viscoelastic properties compared to microcomposites, at similar filler volume fractions.…”

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confidence: 99%

Macro, Micro and Nano Mechanics of Multiphase Polymer Systems

Sarvestani

Jabbari

2011

Handbook of Multiphase Polymer Systems

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Flow behavior of colloidal suspensions in complex fluids has been the subject of intense research [1][2][3][4][5][6][7][8][9][10]. The widespread use of suspensions in industry has for a long time provided motivation for these investigations. Early theoretical research was based on hydrodynamic models. For example, the low shear rate viscosity of a suspension with low volume fraction, , of solid spherical particles can be estimated by the often-quoted Einstein equation [11] where η m represents the linear viscosity of the matrix. Underlying these theoretical models is the assumption of continuum viscoelasticity; i.e. the colloidal particle is saturated by the dispersing medium and is large enough such that the non-hydrodynamic contributions such as Brownian motion, surface forces, and van der Waals interactions between particles are negligible. As a result, models derived from hydrodynamic theories are inherently independent from the size of filler particles and the nature of interfacial bonding. It is therefore not surprising that these equations appear to explain only the results of micron-sized particles [5,12,13]. They are indeed entirely inadequate to elucidate the results obtained from the reinforcing fillers of colloidal and sub-colloidal size such as silica and graphitized carbon black in non-Newtonian fluids [12,14,15].

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Rheological properties of suspensions of TiO2 particles in polymer solutions. 1. Shear viscosity

Cited by 40 publications

References 26 publications

Aggregation in colloidal suspensions and its influence on the suspension viscosity

Aggregation in colloidal suspensions and its influence on the suspension viscosity

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

Macro, Micro and Nano Mechanics of Multiphase Polymer Systems

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