An Experimental Study of the Dynamic Viscosity of Emulsions with Small Droplets in the kHZ Region

Oosterbroek, M.; Lopulissa, J.S.; Mellema, J.

doi:10.1007/978-1-4684-3743-0_112

Cited by 3 publications

(3 citation statements)

References 10 publications

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“…[33] of Ref. (1) it is clear that the larger relaxation time is then a function of 3K + 2/x. In the fits we took ~ = 0, but any linear combination of/z and K can be used.…”

Section: Resultsmentioning

confidence: 99%

Linear viscoelasticity of emulsions

Oosterbroek

Mellema

Lopulissa

1981

Journal of Colloid and Interface Science

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Linear viscoelasticity of emulsions in shear deformation in the kilohertz range is demonstrated experimentally. In order to avoid complications due to inertia effects, emulsions with small droplet sizes are studied. The preliminary measurements are interpreted as being the result of droplet deformations. If this interpretation is correct, measurements of the dynamic viscosity of emulsions may be used to obtain information about the mechanical properties of the interfacial layer between droplets and the continuous phase. In particular, the evaluation of the interfacial tension of emulsion droplets from bulk properties might be possible using this technique.

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“…[33] of Ref. (1) it is clear that the larger relaxation time is then a function of 3K + 2/x. In the fits we took ~ = 0, but any linear combination of/z and K can be used.…”

Section: Resultsmentioning

confidence: 99%

Linear viscoelasticity of emulsions

Oosterbroek

Mellema

Lopulissa

1981

Journal of Colloid and Interface Science

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“…As a result, they are non-applicable to ternary systems, such as reactively compatibilized or nanoparticle filled blends or blends with nanoparticles. It is worth recalling that the properties of the interphase were taken into account in the early classical derivations by Oldroyd [111,112] or by the group from Twente University [178][179][180][181].…”

Section: Discussionmentioning

confidence: 99%

“…The theory was verified experimentally. Semi-concentrated emulsions were examined theoretically and experimentally only within the linear viscoelastic region [178][179][180][181]. Recognizing that the interphase has a final thickness (sometimes the total volume of interphase exceeds that of the dispersed phase) the authors postulated that it might have two interfacial coefficients, n and n , facing the two principal polymer domains.…”

Section: Theoretical Treatment Of Polymer Blendsmentioning

confidence: 99%

Rheology of Polymer Blends

Utracki

2011

Encyclopedia of Polymer Blends

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The first polymer blend was patented in 1846 and since then blends have became ubiquitous. Blending may provide a full set of material properties, improving processability and/or specific properties. With the advancement of technology there is the notorious growth of complexity -while in the beginning blending involved two polymers, initially without a compatibilizer, more recent commercial alloys have up to five polymers, three compatibilizers, and frequently are reinforced with macro-or nanoparticles [1].Blends are classified as either thermodynamically miscible or immiscible, with the latter dominating. However, imposition of a flow affects the thermodynamic equi librium and it may enhance the miscibility of immiscible blends or vice-versa -there is an interrelation between rheology and thermodynamics. Similarly, flow affects the degree of deformation of the dispersed phase, thus in immiscible blends there are other interrelations between rheology and morphology, which affect the blend performance. To the complexity of polymer alloys and blends (PAB) behavior one must add the incorporation of solids, either in the form of filler and nanofiller particles or by simple fact of blending two components with widely different transition temperatures.Since the flow of PAB is complex, it is useful to revert to simple models, for example, for miscible blends to solutions or mixtures of polymer fractions, for immiscible blends to emulsions or suspensions, and for compatibilized blends to block copolymers (Table 2.1). It is also advisable to study flow behavior of multiphase systems at constant stress (not at constant deformation rate) [2,3].For miscible blends, the free volume theory predicts a positive deviation from the log-additivity rule (PDB, positively deviating blend). However, depending on the system and method of preparation, these blends may show a positive deviation, negative deviation, or additivity [4]. Upon mixing, the presence of specific interac tions may change the free volume and degree of entanglement, which in turn affect the flow behavior [5,6]. For immiscible blends the flow is similarly affected, but in addition there are at least three contributing phases: of the polymeric matrix, of the First Edition. Edited by Avraam I. Isayev.

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The Rheology of Two-Phase Flows

Utracki

1993

Rheological Measurement

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An Experimental Study of the Dynamic Viscosity of Emulsions with Small Droplets in the kHZ Region

Cited by 3 publications

References 10 publications

Linear viscoelasticity of emulsions

Linear viscoelasticity of emulsions

Rheology of Polymer Blends

The Rheology of Two-Phase Flows

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