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Polyamic acid: nanoprecipitation and electrophoretic deposition on porous supports
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SYSNO ASEP 0484073 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Polyamic acid: nanoprecipitation and electrophoretic deposition on porous supports Author(s) Brabec, Libor (UFCH-W) RID, ORCID
Sysel, P. (CZ)
Plšek, Jan (UFCH-W) RID, ORCID
Kočiřík, Milan (UFCH-W) RID, ORCID
Dickerson, J.H. (US)Source Title Journal of Coatings Technology and Research. - : Springer - ISSN 1547-0091
Roč. 15, č. 3 (2018), s. 489-496Number of pages 8 s. Language eng - English Country US - United States Keywords Dimethylsulfoxide ; EPD ; Polyimide Subject RIV CF - Physical ; Theoretical Chemistry OECD category Physical chemistry Institutional support UFCH-W - RVO:61388955 UT WOS 000433543100005 EID SCOPUS 85036499873 DOI 10.1007/s11998-017-0004-9 Annotation Polyamic acid (PAA, a precursor of polyimide) was synthesized from 4,4¢-oxydiphthalic anhydride and 4,4¢-oxydianiline. PAA, dissolved in dimethylsulfoxide (DMSO), was precipitated into colloidal particles after its injection into acetone. The resulting particle size distribution was found to depend on aging time of PAA solutions, their concentration, and the manner in which the solutions were mixed with acetone. PAA particles of any size down to 10 nm appeared to be achievable by decreasing the acetone/ DMSO ratio. Particles in DMSO/acetone suspensions were found to have a significant negative zeta potential. Therefore, there was no need to add organic bases
to form PAA anions, in contrast to all previously published studies on the PAA electrodeposition. EPD was performed onto porous stainless-steel or alumina disks, which are suitable supports (reinforcements) for membranes. The slow evaporation of DMSO residue yielded dried polymer layers, comprised of 50-100 nm PAA globules. The outer surface of layers was usually covered with a very thin, continuous PAA skin. Such supported PAA layers-after a simple imidization step via a heat treatment-could be applied as thermally resistant membranes for gas separation.Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2019
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