Polyamic acid : nanoprecipitation and electrophoretic deposition on porous supports / Libor Brabec in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 3 (05/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 3 (05/2018) . - p. 489-496 Titre : Polyamic acid : nanoprecipitation and electrophoretic deposition on porous supports Type de document : texte imprimé Auteurs : Libor Brabec, Auteur ; Petr Sysel, Auteur ; Jan Plsek, Auteur ; Milan Kocirik, Auteur ; James H. Dickerson, Auteur Année de publication : 2018 Article en page(s) : p. 489-496 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dépôt électrophorétique Diméthylsulfoxyde Matériaux poreux Polyimides Polymères -- Synthèse Potentiel zeta Précipitation (chimie) Index. décimale : 667.9 Revêtements et enduits Résumé : 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. Note de contenu : - EXPERIMENTAL : Chemicals - Synthesis of PAA - Imidization of PAA layers - Precipitation of PAA - PAA particles characterization - Porous supports - EPD cell and parameters - RESULTS AND DISCUSSION : Precipitation - fresh and aged PAA solutions - Precipitation of PAA and PAA-APTES under various mixing conditions - Zeta potential of precipitated particles - PAA layers formed by EPD - Layers deposited on porous stainless-steel disks - Layers deposited on porous alumina disks DOI : 10.1007/s11998-017-0004-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0004-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30745 [article]

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