Effects of shear flow on a polymeric bicontinuous microemulsion: Equilibrium and steady state behavior

Krishnan, Kasiraman; Chapman, Bryan; Bates, Frank S.; Lodge, Timothy P.; Almdal, Kristoffer; Burghardt, Wesley R.

doi:10.1122/1.1446883

Cited by 38 publications

(73 citation statements)

References 56 publications

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“…At low temperatures, the behavior of the BmE approaches that of the diblock (and PCHE homopolymer), consistent with a morphology of two 3-dimensional interpenetrating networks of well-segregated domains enriched with each homopolymer (Fig. [43][44][45]48 Similarities in the frequency dependence of the linear viscoelastic properties of the BmE and the pure disordered PCHE-PE-14 diblock, evident in the time-temperature superposed master plots (Fig. However, with increasing temperature the opposite trend is evident, where at the highest measurement temperatures the viscosity of the BmE more closely resembles that of the PE homopolymer.…”

Section: Dynamicssupporting

confidence: 57%

“…[43][44][45][46][47][48][49][50][51] Linear viscoelastic studies have shown that the BmE morphology has ''excess'' viscosity and elasticity arising from the structured nature of the fluid, similar to the behavior of sponge phases, 52,53 liquid crystal based blue phases, 54,55 and worm-like micelles. [43][44][45][46][47][48][49][50][51] Linear viscoelastic studies have shown that the BmE morphology has ''excess'' viscosity and elasticity arising from the structured nature of the fluid, similar to the behavior of sponge phases, 52,53 liquid crystal based blue phases, 54,55 and worm-like micelles.…”

Section: Introductionmentioning

confidence: 99%

“…43,46,47 Interestingly, bicontinuous morphologies and membrane structures derived from surfactants also exhibit multiple relaxation times, similar to polymeric systems. [43][44][45][46][47][48] The structural and dynamical features of the BmE were probed using SANS, SAXS, dynamic mechanical spectroscopy (DMS), and transmission electron microscopy (TEM). This work builds upon previous reports related to other BmE systems.…”

Section: Introductionmentioning

confidence: 99%

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Structure, viscoelasticity, and interfacial dynamics of a model polymeric bicontinuous microemulsion

et al. 2016

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We have systematically studied the equilibrium structure and dynamics of a polymeric bicontinuous microemulsion (BμE) composed of poly(cyclohexylethylene) (PCHE), poly(ethylene) (PE), and a volumetrically symmetric PCHE-PE diblock copolymer, using dynamic mechanical spectroscopy, small angle X-ray and neutron scattering, and transmission electron microscopy. The BμE was investigated over an 80 °C temperature range, revealing a structural evolution and a rheological response not previously recognized in such systems. As the temperature is reduced below the point associated with the lamellar-disorder transition at compositions adjacent to the microemulsion channel, the interfacial area per chain of the BμE approaches that of the neat (undiluted) lamellar diblock copolymer. With increasing temperature, the diblock-rich interface swells through homopolymer infiltration. Time-temperature-superposed linear dynamic data obtained as a function of frequency show that the viscoelastic response of the BμE is strikingly similar to that of the fluctuating pure diblock copolymer in the disordered state, which we associate with membrane undulations and the breaking and reforming of interfaces. This work provides new insights into the structure and dynamics that characterize thermodynamically stable BμEs in the limits of relatively weak and strong segregation.

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Section: Dynamicssupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structure, viscoelasticity, and interfacial dynamics of a model polymeric bicontinuous microemulsion

et al. 2016

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“…Actually, the rather simple principle of Couette flow provides a tremendous range of applications, e.g., in lubricants in sleeve bearings, for blood dialysis in medical science [1][2][3], emulsion polymerization [34], polymerization of blends [39] etc. For experimental investigations of effects of shear flow on polymeric solutions and bicontinuous microemulsions we refer to [37]. The observations specified therein nicely represent our simulation results.…”

Section: Couette Flowsupporting

confidence: 66%

A variational approach to the decomposition of unstable viscous fluids and its consistent numerical approximation

Anders

Weinberg

2011

Z Angew Math Mech

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The mixing and de-mixing properties of highly viscous fluids can be described as a diffusive system driven by an external velocity field. In order to analyze the micro-morphological evolution with a diffusion theory of heterogeneous mixtures we apply a Cahn-Hilliard phase-field model, which is here extended by a convective term. As the model is based on an energetic variational formulation, we state the underlying energy minimizing principles. For consistent finite element analysis we provide a piecewise smooth and globally C 1 -continuous approximation by means of rational B-spline basis functions. Numerical examples exhibit the physical properties of the model. Simulations of phase decomposition and coarsening controlled by diffusion and by convection show the robustness and the versatility of our approach.

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“…The blends of narrow molecular weight distribution ( w / n 1.1) poly(ethyl ethylene) (PEE) with poly(dimethylsiloxane) (PDMS) were compatibilized with their diblock copolymer: PEE/PDMS/PEE-PDMS; the polymer molecular weight of the was: 1.71, 2.13, and 10.4 (w PEE 0.52) kg mol 1 , respectively [252,253]. The dynamic and steady shearing tests were carried out at 15-30 C -the -superposition principle was not obeyed.…”

Section: Influence Of Rheology On Thermodynamicsmentioning

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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Effects of shear flow on a polymeric bicontinuous microemulsion: Equilibrium and steady state behavior

Cited by 38 publications

References 56 publications

Structure, viscoelasticity, and interfacial dynamics of a model polymeric bicontinuous microemulsion

Structure, viscoelasticity, and interfacial dynamics of a model polymeric bicontinuous microemulsion

A variational approach to the decomposition of unstable viscous fluids and its consistent numerical approximation

Rheology of Polymer Blends

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