title: Adsorption of poly(vinyl formamide-co-vinyl amine) (PVFA-co-PVAm) polymers on zinc, zinc oxide, iron, and iron oxide surfaces.
abstract: The adsorption of poly(vinyl formamide) (PVFA) and the statistic copolymers poly(vinyl formamide-co-vinyl amine) (PVFA-co-PVAm) onto zinc and iron metal particles as well as their oxides was investigated. The adsorbates were characterized by means of XPS, DRIFT spectroscopy, wet chemical analysis, and solvatochromic probes. Dicyano-bis-(1,10-phenanthroline)-iron(II) (1), 3-(4-amino-3-methylphenyl)-7-phenyl-benzo-[1,2-b:4,5-b']difuran-2,6-dione (2), and 4-tert-butyl-2-(dicyano-methylene)-5-[4-(diethylamino)-benzylidene]-Δ(3)-thiazoline (3) as solvatochromic probes were coadsorbed onto zinc oxide to measure various effects of surface polarity. The experimental findings showed that the adsorption mechanism of PVFA and PVFA-co-PVAm strongly depends on the degree of hydrolysis of PVFA and pH values and also on the kind of metal or metal oxide surfaces that were employed as adsorbents. The adsorption mechanism of PVFA/PVFA-co-PVAm onto zinc oxide and iron oxide surfaces is mainly affected by electrostatic interactions. Particularly in the region of pH 5, the adsorption of PVFA/PVFA-co-PVAm onto zinc and iron metal particles is additionally influenced by redox processes, dissolution, and complexation reactions.
authors.affiliation: Department of Polymer Chemistry, University of Technology Chemnitz, D-09107 Chemnitz, Germany.
authors.forename: Susan
authors.initials: S
authors.lastname: Seifert
authors.forename: Frank
authors.initials: F
authors.lastname: Simon
authors.forename: Giesela
authors.initials: G
authors.lastname: Baumann
authors.forename: Michael
authors.initials: M
authors.lastname: Hietschold
authors.forename: Andreas
authors.initials: A
authors.lastname: Seifert
authors.forename: Stefan
authors.initials: S
authors.lastname: Spange
mesh_terms: D000327:Adsorption; D005290:Ferric Compounds / Q000737:chemistry*; D005559:Formamides / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D015394:Molecular Structure; D010316:Particle Size; D013499:Surface Properties; D014753:Vinyl Compounds / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D005290:Ferric Compounds; D005559:Formamides; D014753:Vinyl Compounds; C570813:poly(vinyl formamide-co-vinyl amine); C000499:ferric oxide; D007501:Iron; D015032:Zinc; D015034:Zinc Oxide