Viscoelastic Behavior of Disperse Systems with Silicone Oil and Different Fillers

Hadjistamov, Dimiter

doi:10.1515/arh-2002-0017

Cited by 7 publications

(2 citation statements)

References 14 publications

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“…Systems with fumed silica and polydimethylsiloxane rubber are investigated by Southwart [1] and Boonstra et al [2]. There have been a number of publications about systems with fumed silica [3][4][5][6][7][8][9][10], amorphous silica [11], or precipitated silica [12] in polydimethylsiloxane. Recently, the rheological behavior of styrene-butadiene rubber filled with silica particles [13] has been researched.…”

Section: Introductionmentioning

confidence: 99%

Model suspensions with rheological additives: Systems with plastic flow behavior

Hadjistamov¹

2009

Polym Eng Sci

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Model suspensions with different concentrations of the rheological additives Aerosil 380 in silicone oil M20 000 and Bentone 27 in epoxy resin Araldite GY260 were researched. The shear stress and the first normal stress difference were measured simultaneously with shear flow start-up experiments followed by stress relaxation. At higher concentrations, the rheological additives build a strong three-dimensional (3D) structure that leads to systems with plastic flow behavior. It was established that the structure of 7.5% Aerosil 380 in silicone oil M20 000 is strong and stiff due to the big difference between shear stress and normal stress at small shear rates. This solid-like system exhibits only one yield stress region. It was found that the suspensions with a strong 3D structure and comparable values of shear stress and first normal stress difference at small shear rates have a first and a so-called second yield stress regions. In the transition section, between the two yield stress regions, there occurs a break of the distortion and a rearrangement of the structure. The decrease and increase of the first normal stress difference also belongs to the rearrangement of the structure. POLYM. ENG. SCI., 50:811-818, 2010.

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Section: Introductionmentioning

confidence: 99%

Model suspensions with rheological additives: Systems with plastic flow behavior

Hadjistamov¹

2009

Polym Eng Sci

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“…PDMS are utilized as defoaming agent also in the food industry as E900. PDMS are used for breast implants, as a calibration fluid,1 and as matrix fluid for model suspensions in the rheology 2–11. Several authors studied the rheological behavior of polydimethylsiloxane 12–18.…”

Section: Introductionmentioning

confidence: 99%

Determination of the onset of shear thinning of polydimethylsiloxane

Hadjistamov¹

2008

J of Applied Polymer Sci

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ABSTRACT:The shear stress and the first normal stress difference were simultaneously measured in shear flow start-up experiments and a subsequent stress relaxation. The measured polydimethylsiloxane show shear thinning flow behavior with a first Newtonian region up to the shear rate at the onset of shear thinning. We found that the shear stress and the first normal stress difference have an equal shear rate at the onset of shear thinning. The shear stress at the onset of shear thinning does not depend on the molecular weight of the polymer and on temperature. Similar to the viscosity master curve, it is possible to create a normal stress master curve, outgoing from the first normal stress coefficient. The shear rate at the onset of shear thinning is estimated from the viscosity master curve and the shear rate at the onset of normal stress thinning from the normal stress master curve. The shear stress and the first normal stress difference have similar transient behavior with startup stress curves without maximum in stress growth experiments with shear rates from the first Newtonian region. The shear flow start-up experiment with the shear rate at the onset of shear thinning leads to the first indication of an overshoot of the start-up curve. The shear flow start-up experiments with shear rates from the shear thinning region show start-up curves with a maximum for the shear stress and for the first normal stress difference. It was found that the shear rate at the onset of shear thinning and the shear rate at the onset of normal stress thinning, determined by the shear flow start-up measurements, are equal to the values obtained from the master curves.

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Ultrasound directed self-assembly of filler in continuous flow of a viscous medium through an extruder nozzle for additive manufacturing

Felt¹,

Raeymaekers²

2023

Additive Manufacturing Letters

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Viscoelastic Behavior of Disperse Systems with Silicone Oil and Different Fillers

Cited by 7 publications

References 14 publications

Model suspensions with rheological additives: Systems with plastic flow behavior

Model suspensions with rheological additives: Systems with plastic flow behavior

Determination of the onset of shear thinning of polydimethylsiloxane

Ultrasound directed self-assembly of filler in continuous flow of a viscous medium through an extruder nozzle for additive manufacturing

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