Flie�verhalten von dispersen Systemen, die Thixotropiemittel enthalten

Hadjistamov, Dimiter; Degen, K.

doi:10.1007/bf01515700

Cited by 8 publications

(9 citation statements)

References 4 publications

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“…The addition of colloidal silica to the suspensions leads to a frac-tion particle structure and the systems with a yield stress [14]. Silica increases the viscosity and, at higher concentration, changes the flow behavior of systems with epoxy resins [15,16].…”

Section: Introductionmentioning

confidence: 99%

“…At smaller concentrations, the effect can only be an increase in the viscosity of the suspension. Higher Bentone 27 concentrations can lead to the formation of a 3D structure and consequently to a system with plastic flow behavior [25]. The main feature of the systems with plastic flow behavior is the existence of a yield stress s y or a yield stress region.…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

confidence: 99%

Model suspensions with rheological additives: Systems with plastic flow behavior

Hadjistamov¹

2009

Polym Eng Sci

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“…Wir charakterisieren die pastSsen Formulierungen durch zwei Faktoren (14): Dutch den Verdickungs{aktor und den FlieBverhal-tens{aktor. Die beiden Faktoren werden gleich nach der Herstellung (3-5 h) der Formulierung bestimmt.…”

Section: Sedimentations-endzustandunclassified

“…Der Verdickungsfaktor wurde als VerMhnis der Viskosit/iten der Formulierung mit Thixotropiemittel zu derselben ohne Thixotropiemittel bei D =1 sec-: definiert (14). Er-wartungsgem~iB nimmt der Verdickungsfaktor mit der Thixotropiemittel-Konzentration zu, wobei die Formulierungen mit /7 21 immer hfhere Werte zeigen als diese mit C 100.29 (siehe Abb.…”

Section: Verdickungsfaktor Vfunclassified

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Quantitative Erfassung des Sedimentationsvorganges von Füllstoffen in pastösen Formulierungen, die Thixotropiemittel enthalten

Hadjistamov

Degen

1978

Colloid Polymer Sci

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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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Flie�verhalten von dispersen Systemen, die Thixotropiemittel enthalten

Cited by 8 publications

References 4 publications

Model suspensions with rheological additives: Systems with plastic flow behavior

Model suspensions with rheological additives: Systems with plastic flow behavior

Quantitative Erfassung des Sedimentationsvorganges von Füllstoffen in pastösen Formulierungen, die Thixotropiemittel enthalten

Determination of the onset of shear thinning of polydimethylsiloxane

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