caa a22 4500 475763416 CHVBK 20180406123558.0 cr unu---uuuuu 170329e20000101xx s 000 0 eng 10.1007/s003960050007 doi (NATIONALLICENCE)springer-10.1007/s003960050007 Controlled synthesis of stable poly(vinyl formamide- co -vinyl amine)/silica hybrid particles by interfacial post-cross-linking reactions [Elektronische Daten] [I. Voigt, F. Simon, H. Komber, H.-J. Jacobasch, S. Spange]  The chemical synthesis and the physicochemical properties of stable poly(vinyl formamide-co-vinyl amine)/silica hybrid particles are presented. Copolymers of poly(vinyl formamide) (PVFA) and poly(vinyl amine) (PVAm) and their protonated forms were adsorbed onto silica from aqueous solutions. The influences of the pH strength and the ion concentration of the aqueous solution as well as the copolymer composition (degree of hydrolyzation of PVFA), and the molecular mass on the adsorption process were investigated by electrokinetic measurements, potentiometric titration, and quantitative elemental analyses. Silica surface-charge neutralization is achieved at a pH strength above 10 for highly hydrolyzed (95%) PVFA polymers. Decreasing the amino content in the PVAm chain shifts successively both the point of zero charge and the isoelectric point to lower pH values. PVFA-co-PVAm layers onto silica are adsorbed weakly. To fix these layers irreversibly, cross-linking reactions with (4,4′-diisocyanate)diphenyl methane were carried out on the surface of solid PVFA-co-PVAm/silica hybrid particles suspended in acetone. The cross-linking reaction, which is connected with the conversion of amino groups, is also a tool to control the surface charge of the PVFA-co-PVAm/silica hybrids. X-ray photoelectron spectroscopy and solid-state 13C cross-polarization magic-angle spinning NMR spectroscopy were used to obtain information on the number of and the structure of the functionalized polyelectrolyte layers on silica. The success of cross-linking was also shown by the results of these spectroscopic methods. Springer-Verlag Berlin Heidelberg, 2000 Key words Polyelectrolyte adsorption nationallicence Silica nationallicence Hybrid materials nationallicence Copolymers from poly(vinyl formamide) and poly(vinyl amine) nationallicence Cross-linking nationallicence Voigt I. Institute of Polymer Research, Hohe Strasse 6, D-01069 Dresden, Germany e-mail: frsimon@ipfdd.de, DE aut Simon F. Institute of Polymer Research, Hohe Strasse 6, D-01069 Dresden, Germany e-mail: frsimon@ipfdd.de, DE aut Komber H. Institute of Polymer Research, Hohe Strasse 6, D-01069 Dresden, Germany e-mail: frsimon@ipfdd.de, DE aut Jacobasch H.-J aut Spange S. Department of Polymer Chemistry Technical University Chemnitz Zwickau Strasse der Nationen 62 D-09101 Chemnitz, Germany e-mail: stefan.spange@chemie.tu-chemnitz.de, DE aut https://doi.org/10.1007/s003960050007 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003960050007 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Voigt I. Institute of Polymer Research, Hohe Strasse 6, D-01069 Dresden, Germany e-mail: frsimon@ipfdd.de, DE aut NATIONALLICENCE 700 1- Simon F. Institute of Polymer Research, Hohe Strasse 6, D-01069 Dresden, Germany e-mail: frsimon@ipfdd.de, DE aut NATIONALLICENCE 700 1- Komber H. Institute of Polymer Research, Hohe Strasse 6, D-01069 Dresden, Germany e-mail: frsimon@ipfdd.de, DE aut NATIONALLICENCE 700 1- Jacobasch H.-J aut NATIONALLICENCE 700 1- Spange S. Department of Polymer Chemistry Technical University Chemnitz Zwickau Strasse der Nationen 62 D-09101 Chemnitz, Germany e-mail: stefan.spange@chemie.tu-chemnitz.de, DE aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer