On spinodal decomposition of binary polymer blends under shear flows

He, David Qiwei; Nauman, E. Bruce

doi:10.1016/s0009-2509(96)00432-0

Cited by 19 publications

(6 citation statements)

References 10 publications

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“…Here we restrict ourselves to a comparison of characteristic sizes of produced morphologies. For a detailed investigation of the morphology type and controlling parameters see available literature …”

Section: Comparison Of Modeling and Experimental Resultsmentioning

confidence: 99%

Polystyrene Microstructured Foams Formed by Thermally Induced Phase Separation from Cyclohexanol Solution

Nistor

Vonka

Rygl

et al. 2016

Macromol. React. Eng.

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The thermally induced phase separation can be used to prepare materials of various microstructured morphologies that define their applications. In this work, foams formed from a polystyrene‐cyclohexanol solution are prepared, characterized, and modeled. To obtain a reliable thermodynamic description, cloud points are determined by an in‐house fabricated thermooptical device. The Flory–Huggins lattice model combined with Hansen solubility theory is employed as input to the Cahn–Hilliard model of phase separation dynamics. The previously reported model is extended by incorporating polar interactions. The resulting experimental and predicted morphologies are compared and good prediction capabilities of the model regarding the resulting morphology and its characteristics are obtained. The experimental and modeling work extends the knowledge of the mechanism and the kinetics of foam morphology evolution for thermal and sound insulation applications.

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Section: Comparison Of Modeling and Experimental Resultsmentioning

confidence: 99%

Polystyrene Microstructured Foams Formed by Thermally Induced Phase Separation from Cyclohexanol Solution

Nistor

Vonka

Rygl

et al. 2016

Macromol. React. Eng.

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“…Other field-based simulations have mainly relied on time-dependent Ginzburg Landau models, which have the advantage that one can reach much later stages of demixing. They were used to study demixing processes at equilibrium [126,[260][261][262][263] and under shear [264,265]. Particularly interesting morphologies can be obtained if the dynamics in the two phases is distinctly different, i.e., one component becomes glassy during the demixing process [31] or crystallizes [29,30,266].…”

Section: Homopolymer Blendsmentioning

confidence: 99%

“…They were used to study demixing processes at equilibrium 126,[260][261][262][263] and under shear. 264,265 Particularly interesting morphologies can be obtained if the dynamics in the two phases is distinctly different, i.e., one component becomes glassy during the demixing process 31 or crystallizes. 29,30,266 The particle-based studies mentioned so far have used coarse-grained models of blends that demix explicitly for energetic reasons.…”

Section: Bulk Propertiesmentioning

confidence: 99%

Theory and Simulation of Multiphase Polymer Systems

Schmid

2011

Handbook of Multiphase Polymer Systems

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The theory of multiphase polymer systems has a venerable tradition. The 'classical' theory of polymer demixing, the Flory-Huggins theory, was developed in the 1940s [1,2]. It is still the starting point for most current approaches -be they improved theories for polymer (im)miscibility that take into account the microscopic structure of blends more accurately, or sophisticated field theories that allow to study inhomogeneous multicomponent systems of polymers with arbitrary architectures in arbitrary geometries. In contrast, simulations of multiphase polymer systems are quite young. They are still limited by the fact that one must simulate a large number of large molecules in order to obtain meaningful results. Both powerful computers and smart modeling and simulation approaches are necessary to overcome this problem.In the limited space of this chapter, we can only give a taste of the state-of-the-art in both areas, theory and simulation. Since the theory has reached a fairly mature stage by now, many aspects of it are covered in textbooks on polymer physics [3][4][5][6][7][8][9]. The information on the state-of-the art of simulations is much more scattered. This is why we have put some effort into putting together a representative list of references in this area -which is of course still far from complete.The chapter is organized as follows. In Section II, we briefly introduce some basic concepts of polymer theory. The purpose of this part is to make the chapter accessible to readers who are not very familiar with polymer physics; it can safely be skipped by the others. Section III is devoted to the theory of multiphase polymer systems. We recapitulate the Flory-Huggins theory and introduce in particular the concept of the Flory interaction parameter (the χ parameter), which is a central ingredient in most theoretical descriptions of multicomponent polymer systems. Then we focus on one of the most successful mean-field theories for inhomogeneous (co)polymer blends, the self-consistent field theory. We sketch the main idea, discuss various Handbook of Multiphase Polymer Systems, First Edition. Edited by Abderrahim Boudenne, Laurent Ibos, Yves Candau, and Sabu Thomas.

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“…The concept combined with a Flory‐Huggins approach was applied by Nauman et al , for polymer solutions to investigate diffusion processes. In further works, they also considered the Stokes equation to account for the flow field using a discontinuous and interfacial tension‐dependent expression for the stress tensor , derived an expression for the volumetric forces that arise from concentration gradients , and modeled spinodal decomposition of polymer blends under shear flow , . To minimize the numerical effort, the chemical potentials were linearized, but this linearization led to a vanishing of the phases.…”

Section: Introductionmentioning

confidence: 99%

Fluid Simulation‐Supported Extraction Process Design: An Approach Towards Improving Current Models

Zimmermann

Zeiner

2020

Chemie Ingenieur Technik

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In recent years, computational fluid dynamics (CFD) has become a valuable tool for the design of extraction processes. CFD simulations have been combined with population balances to account for coalescence and breakage. In this work, another approach to account for drop interactions is shown, namely, the incompressible Cahn-Hilliard/Navier-Stokes equations. To apply the Cahn-Hilliard equations, they have to be combined with a thermodynamic model. Here, a Koningsveld-Kleintjens approach is used to account for the mixing gap of the binary mixture. The suggested method was applied to analyze drops in a shear field and to investigate drop coalescence.

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On spinodal decomposition of binary polymer blends under shear flows

Cited by 19 publications

References 10 publications

Polystyrene Microstructured Foams Formed by Thermally Induced Phase Separation from Cyclohexanol Solution

Polystyrene Microstructured Foams Formed by Thermally Induced Phase Separation from Cyclohexanol Solution

Theory and Simulation of Multiphase Polymer Systems

Fluid Simulation‐Supported Extraction Process Design: An Approach Towards Improving Current Models

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