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Elyashevich, G. K.; Karpov, E. A.; Kudasheva, O. V.; Rosova, E. Yu.

doi:10.1023/a:1009868416798

Cited by 13 publications

(8 citation statements)

References 8 publications

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“…A thin PANI layer was deposited on the PE membrane tion of microfiltration membranes of low-density polyethylene (PE) involving melt extrusion at a high flow surface from an aqueous dispersion of PANI with particles of about 0.3 micron in size, obtained by polymeriz-velocity with subsequent annealing, drawing, and thermal stabilization. 1,2 The microporous films obtained by ing aniline in an aqueous solution of poly(vinyl alcohol) (PVA). 8 The layer of thickness of 4-7 microns, con-this technique have a mean pore size of 0.045 microns, high permeability, small thickness, and good mechani-sisting of PANI particles embedded in the PVA matrix, revealed high adhesion to the PE membrane surface.…”

Section: Received 25 November 1996; Accepted 26 November 1996mentioning

confidence: 99%

Combined polyethylene-polyaniline membranes

Elyashevich

Козлов

Gospodinova

et al. 1997

J. Appl. Polym. Sci.

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We previously developed a technique for the prepara-and electrolytes) were produced in the following way. A thin PANI layer was deposited on the PE membrane tion of microfiltration membranes of low-density polyethylene (PE) involving melt extrusion at a high flow surface from an aqueous dispersion of PANI with particles of about 0.3 micron in size, obtained by polymeriz-velocity with subsequent annealing, drawing, and thermal stabilization. 1,2 The microporous films obtained by ing aniline in an aqueous solution of poly(vinyl alcohol) (PVA). 8 The layer of thickness of 4-7 microns, con-this technique have a mean pore size of 0.045 microns, high permeability, small thickness, and good mechani-sisting of PANI particles embedded in the PVA matrix, revealed high adhesion to the PE membrane surface. cal properties. Owing to these parameters, the films can be efficiently used as a support for depositing aThe adhesion remained high also upon exposure to solvents such as ethyl alcohol and propylene carbonate, layer of another polymer which is either unable to form film or the film made from it has poor mechanical char-and no peeling of the PANI-containing layer occurred even upon breakdown of the membrane. acteristics but reveals separating (''membranelike'') properties. Such a polymer is polyaniline (PANI), It should be noted that conventional PE films obtained by melt extrusion exhibit low adhesion to the which is able not only to retain or to exchange anions under an applied voltage 3 or without it, 4 but also to majority of polymeric and nonpolymeric materials. Actually, a PANI-containing layer formed by the same separate neutral species (solutes and gases). 5-7 The first case is associated with the change of pK a , and the way as onto PE membranes is readily separated from both as-spun and annealed PE films. On the other hand, second case is connected with the variation of polymer morphology upon changes in the degree of oxidation of a film of neat PVA exhibits poor adhesion not only to the conventional PE films, but also to the surface of PE PANI. The utilization of the useful separating properties of PANI, however, is hindered by the poor process-membranes. These facts allow one to suggest that the reasons of the high adhesion of the PANI-containing ability and poor mechanical properties. Thus, the preparation of combined PE-PANI membranes represents layer are associated to both the highly developed surface of the PE membrane and the peculiarities of the considerable scientific and practical interest. It should be noted that, to the best of our knowledge, no informa-structure of PANI-containing layer. The electrical conductivity of the PANI-containing tion on the preparation of PE-PANI membranes is available at present. layer of combined membranes measured by a conven-In this article, we now report a method for the prepational four-probe technique ( s Å 0.2 S/cm) is equal to ration of combined membranes on the basis of a mithat of a film cast from the initial PANI dispersion. crofiltration PE membrane and PANI. Co...

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Section: Received 25 November 1996; Accepted 26 November 1996mentioning

confidence: 99%

Combined polyethylene-polyaniline membranes

Elyashevich

Козлов

Gospodinova

et al. 1997

J. Appl. Polym. Sci.

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“…[1][2][3][4] Unfortunately, it cannot be used for large volume profiles. There are several orientation types and procedures.…”

Section: Introductionmentioning

confidence: 99%

Structure and morphology of linear polyethylene extrudates induced by elongational flow

Rybnikář

Kaszonyiova

Čermák

et al. 2012

J of Applied Polymer Sci

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This study focuses on the structure, morphology, and properties of linear polyethylene (PE) profiles manufactured by continuous extrusion. High level of chain orientation was achieved using specific flow and processing conditions. An extrusion die with semihyperbolic convergency was used to generate high percentage of elongational flow and chain extension. Simultaneously, high extrusion pressure and relatively low melt temperature led to flow-induced crystallization of PE extended chains. The structure of PE tapes consists of crystal aggregates with different level of orientation and crystallinity.

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“…In addition to all of these applications, they can be used as supports for the preparation of porous ceramic membranes or as templates for the preparation of metal nanotubes. Four common techniques for the preparation of porous polymeric membranes are (1) phase inversion,1–6 (2) extrusion‐stretching,7–12 (3) template‐leaching,13–18 and (4) track‐etching19–24 techniques. These techniques have been developed based on the properties of the raw polymeric materials used and on the targeted applications of the resulting membranes.…”

Section: Introductionmentioning

confidence: 99%

“…Extrusion‐stretching technique,7–12 mainly used to prepare porous polymeric membranes from either filled or unfilled semicrystalline polymers, comprises two consecutive steps. In the first, an oriented film is produced by melt‐extrusion process with a rapid haul‐off speed.…”

Section: Introductionmentioning

confidence: 99%

“…After solidifying, the film is stretched in either parallel or perpendicular direction to the original orientation of the polymer crystallites. For unfilled systems, the second stretching deforms the crystalline structure of the film and produces slit‐like pores with diameters ranging from ∼20 to 50 nm 7, 9, 10. For filled systems, the second stretching results in partial removal of the solid fillers, yielding porous structure 8, 11, 12.…”

Section: Introductionmentioning

confidence: 99%

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Polycarbonate microfilters by nuclear tracking and chemical etching (track‐etching) technique: Preparation and characterization

Makphon

Ratanatongchai²,

Chongkum³

et al. 2006

J of Applied Polymer Sci

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Track-etched polycarbonate (PC) microfilters were successfully prepared by tracking with fission fragments in the Thai Research Reactor-1/Modification-1 nuclear reactor and chemical etching with sodium hydroxide aqueous solutions. The porosity of the as-prepared microfilters can be controlled by varying the exposure time in the nuclear reactor and the average pore diameter by varying the etching conditions. In the present work, the average pore diameter of the as-prepared microfilters ranged from ϳ2.0 to 9.5 m (workable values) and the highest pore density achieved was ϳ150,000 pores cm Ϫ2 . It was found that chemical etching also caused a reduction in the film thickness. Fourier-transform infrared spectroscopy results suggested some modifications in the chemical structure of the PC molecules after both nuclear tracking and chemical etching steps. Lastly, water permeability of the as-prepared, tracketched PC microfilters was found to increase with increasing average pore diameter.

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Cited by 13 publications

References 8 publications

Combined polyethylene-polyaniline membranes

Combined polyethylene-polyaniline membranes

Structure and morphology of linear polyethylene extrudates induced by elongational flow

Polycarbonate microfilters by nuclear tracking and chemical etching (track‐etching) technique: Preparation and characterization

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