Fällungsstrukturen aus Polymerlösungen für Trennmaterialien

Dautzenberg, H.; Gensrich, H.‐J.; Gröbe, V.; Hicke, Hans‐Georg; Paul, D. R.

doi:10.1002/actp.1989.010400305

Cited by 3 publications

(1 citation statement)

References 11 publications

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“…In the present work, we discuss a different procedure to produce polyHIPE from premade homopolymers and block copolymers, whose emulsification based on selective solvent casting does not require any polymerization process. Although a wide range of morphologies can be obtained by solvent casting, − we will show that only a specific selection of solvents, copolymers, and homopolymer molecular weights leads to the production of polyHIPE blends. In particular, it will be demonstrated that a suitable emulsion process leads to metastable polyHIPE morphologies in which the high internal phase volume ratio is well beyond that of close packing of spherical domains of the discrete phase.…”

Section: Introductionmentioning

confidence: 87%

Tailoring Morphologies in Polymeric High Internal Phase Emulsions by Selective Solvent Casting

2003

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A wide range of different morphologies have been obtained by solvent casting of mixtures of polystyrene (PS) and poly(2-vinylpyridine) homopolymers (PVP) with PS-PVP block copolymer. The curvature of the PS-PVP interface has been investigated as a function of polymer molecular weights, solvent quality, and blend composition. For blends with highly asymmetric composition at equilibrium, simulations based on self-consistent-field theory (SCF) predicted a curvature of the interface toward the minority phase. Casting PS/PVP blends from a common solvent for both PS and PVP resulted in morphologies that were in qualitative agreement with SCF simulations. These morphologies nucleated and grew from an initially fully homogeneous solution. Quite different morphologies resulted when mixtures of separate solutions of PS and PVP in selective solvents were cast, if PS-PVP of the appropriate asymmetry was added to either the PS or PVP solution. Polymeric high internal phase emulsions (polyHIPE) were formed in which the majority phase was dispersed in the continuous minority phase. A requirement for successful polyHIPE formation is that the selective solvent for the homopolymer and majority block of the block copolymer (continuous phase of the polyHIPE) has to be a sufficiently poor solvent for the minority block, thus inducing a strong segregation of the block copolymer at the interface between the two solution phases. A simple way to ensure that this condition is satisfied is to verify that the PS-PVP block copolymers form micelles in the selective solvents. The formation of such micelles was detected using dynamic light scattering.

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Section: Introductionmentioning

confidence: 87%

Tailoring Morphologies in Polymeric High Internal Phase Emulsions by Selective Solvent Casting

2003

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Separation properties and surface morphology of polyacrylonitrile membranes

Paul¹,

Kamusewitz²,

Hicke³

et al. 1992

Acta Polymerica

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Membrane TV1 TV2 TV3 TVIIT TV21T TV3lT 1900 480 250 2000 500 250 21 17 15 20The formation of polyacrylonitrile membranes by phase inversion has been studied. The surface morphology, as investigated by atomic force microscopy, and the separation performance in ultrafiltration were correlated with the concentration of the polymer in the casting solution and a post-treatment by annealing. Trenneigenschaften und Oberflachenmorphologie von Polyaciylnitril-MembranenPolyacrylnitril-Membranen, hergestellt aus GieRIosungen mit unterschiedlicher Polymerkonzentration und thermisch nachbehandelt, zeigen eine Korrelation zwischen Herstellungsbedingungen und der mit Hilfe der Atom-Kraftfeld-Mikroskopie abgebildeten Oberflachenmorphologie beziehungsweise den Trenneigenschaften bei der Ultrafiltration.

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Developments in Membrane Research: from Material via Process Design to Industrial Application

et al. 2006

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The aim of this review paper is to give an overview of the research activities of GKSS in the field of polymer based membranes. After summarizing the historic development of membrane science at GKSS, it describes different classes of polymeric materials for membranes, and the characterization of membranes. The design of membrane‐based separation processes followed by examples of applications will also be presented. In the last chapter we will try to give an outlook for the future activities in membrane research.

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Fällungsstrukturen aus Polymerlösungen für Trennmaterialien

Cited by 3 publications

References 11 publications

Tailoring Morphologies in Polymeric High Internal Phase Emulsions by Selective Solvent Casting

Tailoring Morphologies in Polymeric High Internal Phase Emulsions by Selective Solvent Casting

Separation properties and surface morphology of polyacrylonitrile membranes

Developments in Membrane Research: from Material via Process Design to Industrial Application

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