Preparation of Polyacrylonitrile Membranes by Vapor Induced Phase Separation

2019 ◽  
Vol 816 ◽  
pp. 174-179
Author(s):  
Alexey A. Yushkin ◽  
D.S. Bakhtin ◽  
M.N. Efimov ◽  
G.P. Karpacheva ◽  
A.V. Volkov
Keyword(s):  
Phase Separation ◽  
Porous Structure ◽  
Membrane Permeability ◽  
Exposure Time ◽  
Porous Membranes ◽  
Blue Dextran ◽  
Water Vapors ◽  
Water Permeance

The porous membranes made of polyacrylonitrile (PAN) were developed by vapor induced phase separation (VIPS) technique. The effect of vapor exposure time on membrane permeability and a porous structure was investigated. All membranes exposed in water vapors have a sponge-like structure in contrast to the finger-like structure of PAN membrane obtained by non-solvent induced phase separation (NIPS) method. The obtained membranes demonstrated water permeance up to 405 kg/m2•h•bar and the retention of Blue Dextran (MW 70 kDa) on the level of 52-83%.

Phase separation, porous structure, and cure kinetics in aliphatic epoxy resin containing hyperbranched polyester

2006 ◽  
Vol 44 (6) ◽  
pp. 889-899 ◽  
Author(s):  
Qipeng Guo ◽  
Alexia Habrard ◽  
Yoosup Park ◽  
Peter J. Halley ◽  
George P. Simon
Keyword(s):  
Phase Separation ◽  
Porous Structure ◽  
Epoxy Resin ◽  
Cure Kinetics ◽  
Hyperbranched Polyester

Preparation of porous structure in the system of PEEK/PPS/diphenyl ketone via thermally induced phase separation

2007 ◽  
Vol 104 (3) ◽  
pp. 1523-1530 ◽  
Author(s):  
Huaiyu Ding ◽  
Qiang Zhang ◽  
Ye Tian ◽  
Yanqiao Shi ◽  
Biqian Liu
Keyword(s):  
Phase Separation ◽  
Porous Structure ◽  
Thermally Induced Phase Separation ◽  
Thermally Induced

scholarly journals Durability and Recoverability of Soft Lithographically Patterned Hydrogel Molds for the Formation of Phase Separation Membranes

Micromachines ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 108
Author(s):  
Asad Asad ◽  
Masoud Rastgar ◽  
Hadi Nazaripoor ◽  
Mohtada Sadrzadeh ◽  
Dan Sameoto
Keyword(s):  
Phase Separation ◽  
Solvent Extraction ◽  
Cold Treatment ◽  
Porous Membranes ◽  
Separation Processes ◽  
Separation Membranes ◽  
Membrane Fabrication ◽  
Phase Separation Process ◽  
Continuous Use ◽  
Recovery Result

Hydrogel-facilitated phase separation (HFPS) has recently been applied to make microstructured porous membranes by modified phase separation processes. In HFPS, a soft lithographically patterned hydrogel mold is used as a water content source that initiates the phase separation process in membrane fabrication. However, after each membrane casting, the hydrogel content changes due to the diffusion of organic solvent into the hydrogel from the original membrane solution. The absorption of solvent into the hydrogel mold limits the continuous use of the mold in repeated membrane casts. In this study, we investigated a simple treatment process for hydrogel mold recovery, consisting of warm and cold treatment steps to provide solvent extraction without changing the hydrogel mold integrity. The best recovery result was 96%, which was obtained by placing the hydrogel in a warm water bath (50 °C) for 10 min followed by immersing in a cold bath (23 °C) for 4 min and finally 4 min drying in air. This recovery was attributed to nearly complete solvent extraction without any deformation of the hydrogel structure. The reusability of hydrogel can assist in the development of a continuous membrane fabrication process using HFPS.

Thermally Induced Phase Separation in Semicrystalline Polymer Solutions: How Does the Porous Structure Actually Arise?

2021 ◽  
pp. 102558
Author(s):  
Konstantin V. Pochivalov ◽  
Andrey V. Basko ◽  
Tatiana N. Lebedeva ◽  
Anna N. Ilyasova ◽  
Mikhail Yu. Yurov ◽  
...  
Keyword(s):  
Phase Separation ◽  
Porous Structure ◽  
Polymer Solutions ◽  
Semicrystalline Polymer ◽  
Thermally Induced Phase Separation ◽  
Thermally Induced

Meso- and Macroporous Ceramics by Phase Separation and Reactive Sintering Methods

MRS Bulletin ◽  
2009 ◽  
Vol 34 (8) ◽  
pp. 587-591 ◽  
Author(s):  
Yoshikazu Suzuki ◽  
Peter E.D. Morgan
Keyword(s):  
Phase Separation ◽  
Porous Structure ◽  
Borosilicate Glass ◽  
Selective Etching ◽  
Separation Method ◽  
Reactive Sintering ◽  
Synthesis Technique ◽  
Recent Developments ◽  
New Applications ◽  
Sintering Method

AbstractControlled pore glasses are formed through selective etching of one phase of a spinodally decomposed borosilicate glass, an old technique that is the basis of the porous Vycor synthesis technique developed in the 1920s. This technique is receiving renewed attention as these glasses find new applications as substrates for biosensing, bioreactors, precise filtration, and chromatography. Analogous techniques are being applied to crystalline ceramics, such as directed cooling of ZrO2/MgO and MgAl2O4/Al2O3 eutectics to drive phase separation with the subsequent dissolution of one phase. Pyrolytic reactive sintering is a combination of the phase separation method and the reactive sintering method to obtain a 3D porous structure network. For example, dolomite (CaMg[CO3]2) and ZrO2 yield a uniformly porous CaZrO3/MgO composite that utilizes evolved CO2 as a “pore-forming agent.” This article gives an overview of recent developments on meso- and macroporous ceramics based on phase separation and reactive sintering technologies.

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