Viscoelasticity and microstructure of non-ionic microemulsions

Eshuis, A.; Mellema, J.

doi:10.1007/bf01417549

Cited by 10 publications

(8 citation statements)

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“…For a certain overall composition and temperature the mixture becomes a dispersion of tiny oil droplets in water. It turned out [7] that for a particular microemulsion the amount of water can be changed without change of structure if a certain ratio of oil-surfactant is kept constant. In figure 3 such a dilution series, with volume fractions ~b = 0.203, 0.175, 0.146, 0.118, is shown for a mixture of n-hexane, water and NNP7 (polyoxyethylated (7)-nonylphenolether) with a constant wt/wt ratio of 1.2 for NNP7/hexane.…”

Section: Discussion Of the Emulsion Resultsmentioning

confidence: 99%

“…In the mean time adequate apparatus development [6] enhanced the possibilities for the investigation of emulsions. As well for emulsions with small radius [5] as for microemulsions [7,8] corroborations could be given for the notion of linear viscoelastic behaviour of emulsions due to interfacial tension effects. A striking feature of some microemulsion results in particular [7] was that the complex modulus showed more than two relaxation times which could not be accounted for by Oldroyd's theories.…”

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confidence: 97%

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Simple linear viscoelastic models of dilute solutions of polymer molecules and emulsion droplets

1987

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Abstract:The complex viscosity of microemulsions shows relaxation processes of which the largest relaxation time is about 10 -5 s or less. This time can be attributed to relaxation of stresses in the surface of emulsion droplets pertaining to interfacial tension. Superimposed on a spherical droplet surface shape fluctuations can occur due to thermal energies. Our aim is to show the influence of thermal shape fluctuations on the complex viscosity of emulsions. The method used in the derivation has also been applied to inflexible rods to demonstrate its feasibility by showing the formal rheological equivalence of in length thermally fluctuating rods and Rouse's simple model of polymers. The emulsion results have been applied to a dilution series of a non-ionic microemulsion.

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Section: Discussion Of the Emulsion Resultsmentioning

confidence: 99%

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confidence: 97%

Simple linear viscoelastic models of dilute solutions of polymer molecules and emulsion droplets

1987

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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%

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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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