Rheology of filled polymers

Malkin, A. Ya.

doi:10.1007/3-540-52791-5_2

Cited by 77 publications

(29 citation statements)

References 36 publications

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“…Early work on polymer solutions by Highgate and Whorlow [39] first suggested that relative fluidities of suspensions could be collapsed on to that of the suspending fluid with simple shift factors over a wide range of particle fractions. Additional authors [40][41][42][43][44][45][46][47] investigated other types of viscoelastic suspending fluids and observed similar behavior. Using an effective shear rate concept, Ohl and Gleissle [48] formalized a general shifting procedure to collapse suspension data on to that of the suspending medium at a constant shear stress…”

Section: Introductionmentioning

confidence: 76%

Rheology of non-Brownian particles suspended in concentrated colloidal dispersions at low particle Reynolds number

Cwalina¹,

Wagner²

2016

Journal of Rheology

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The shear flow of non-Brownian glass spheres suspended in a concentrated colloidal dispersion that exhibits non-Newtonian rheology is investigated. At low volume fractions, the addition of non-Brownian spherical particles to the colloidal dispersion leads to an increase in the steady shear viscosity as well as the dynamic moduli. The flow curves of these suspensions are qualitatively similar to the suspending colloidal dispersion medium, and as such, in this semidilute regime, the suspension data can be shifted on to that of the colloidal dispersion medium at constant shear stress with shift factors comparable to those predicted for spherical particles in a Newtonian fluid. At higher volume fractions of non-Brownian spheres, the shear thickening power law exponent increases with the addition of non-Brownian particles. This increase in the shear thickening power law exponent is shown to be consistent with the effects of confinement on the shear thickening colloidal dispersion by the larger non-Brownian particles. V

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Section: Introductionmentioning

confidence: 76%

Rheology of non-Brownian particles suspended in concentrated colloidal dispersions at low particle Reynolds number

Cwalina¹,

Wagner²

2016

Journal of Rheology

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“…Ref. [1]. As predicted by these models, the reduced hydrodynamic properties P p Pw=P0 (such as the apparent shear viscosity, shear moduli, etc.…”

Section: Introductionmentioning

confidence: 85%

Viscoelasticity and flow behavior of irradiation grafted nano-inorganic particle filled polypropylene composites in the melt state

Privalko

Shumsky

Привалко

et al. 2002

Science and Technology of Advanced Materials

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“…To account for shear thinning, and the difference in the viscosity of the matrices, the relative viscosity (77, = q / v 0 , where qo is the viscosity of the pure matrix) was calculated and plotted, as a function of shear rate, for the four filled systems in Figs. 1 1 to 14. We suggest that the largest agglomerates in this study are formed in the composite containing 20% DVl3-PS particles in the lower molecular weight PMMA matrix; in fact, a network of particles is formed, with chains of particles connecting large agglomerates, as observed in SEM photographs of fracture surfaces of such composites. The formation of a network results in very high viscosities and highly non-Newtonian behavior.…”

Section: Effect Of Molecular Weight Of the Matrixmentioning

confidence: 99%

Model filled polymers. XV: The effects of chemical interactions and matrix molecular weight on rheology

Agarwal

Salovey

1995

Polymer Engineering & Sci

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In order to explore the effects of chemical composition on the rheological behavior o filled polymeric systems, we prepared polystyrene (9PS) and poly(methyl methacrylate) (PMMA) particles crosslinked with either ethylene glycol dimethacrylate (EGDMA) or divinyl benzene (DVB), and mixed these particles in a PMMA matrix. PS particles crosslinked with 10% EGDMA are better dispersed in a PMMA matrix, compared to PS particles, crosslinked with 10% DVB, due to the compatibilizing effect of EGDMA. For PMMA particles crosslinked with DVB, particle‐matrix interactions in a PMMA matrix are smaller than in EGDMA‐PMMA filled PMMA. Therefore, particles tend to agglomerate in PMMA composites filled with DVB‐PMMA particles, especially in a low molecular weight matrix. We compared PMMA matrices of molecular weights 35,000 and 75,000. Higher particle‐matrix interaction in the higher molecular weight matrix resulted in lower relative viscosities for DVB‐PS filled systems, due to better dispersion of the particles. Composites filled with EGDMA‐PS particles behave similarly to those filled with DVB‐PS particles. PMMA composites filled with DVB‐PMMA particles have a lower relative viscosity in the higher molecular weight PMMA matrix at low shear rates, due to better dispersion in the higher molecular weight matrix. However at high shear rates, particles are well dispersed in both PMMA matrices and, then, the relative viscosity is higher due to better bonding in the higher molecular weight matrix.

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Rheology of filled polymers

Cited by 77 publications

References 36 publications

Rheology of non-Brownian particles suspended in concentrated colloidal dispersions at low particle Reynolds number

Rheology of non-Brownian particles suspended in concentrated colloidal dispersions at low particle Reynolds number

Viscoelasticity and flow behavior of irradiation grafted nano-inorganic particle filled polypropylene composites in the melt state

Model filled polymers. XV: The effects of chemical interactions and matrix molecular weight on rheology

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