Surface-deposited acid/base on glass microfibers in formation of (3-aminopropyl)triethoxysilane-[2-(3,4-epoxycyclohexyl)ethyl]heptaisobutyloctasilsesquioxane bioverlay.
Silanization of macroporous glass microfiber filters with (3-aminopropyl)triethoxysilane (APTES) and subsequent binding of [2-(3,4-epoxycyclohexyl)ethyl]heptaisobutyloctasilsesquioxane (E-POSS) to the amine-terminated surface of microfibers was studied. Prior to the silanization, minute quantities of concentrated aqueous solutions of hydrochloric acid or ammonia were adsorbed in the filters while attachment of E-POSS molecules to APTES overlay was not specially catalyzed. Analysis of DRIFT, XPS, and 13C CP/MAS NMR spectra has shown that the formation of APTES overlay is affected differently by the surface-deposited acid or base. It was proved by XPS that microfibers with the adsorbed acid take up higher amounts of covalently attached APTES by 42% and, subsequently, of E-POSS by 65% than microfibers with the adsorbed ammonia. The molecular mechanics model calculations, which were made using silica as a template, have shown that approximately two-layered APTES coating can be built on the model surface if complete hydrolysis of ethoxy groups and vertical condensation of APTES species are assumed.
Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic. tiscenko@imc.cas.cz
Galina A
GA
Tishchenko
Jirí
J
Brus
Jirí
J
Dybal
Michal
M
Pekárek
Zdenka
Z
Sedláková
Miroslav
M
Bleha
Zdenek
Z
Bastl
D002627:Chemistry, Physical / Q000379:methods; D005583:Fourier Analysis; D005898:Glass / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008855:Microscopy, Electron, Scanning; D008956:Models, Chemical; D008968:Molecular Conformation; D015394:Molecular Structure; D017646:Organosilicon Compounds / Q000737:chemistry*; D011437:Propylamines; D012821:Silanes / Q000737:chemistry*; D012984:Software; D013052:Spectrometry, X-Ray Emission / Q000379:methods; D013053:Spectrophotometry / Q000379:methods; D013499:Surface Properties
C520953:(2-(3,4-epoxycyclohexyl)ethyl)heptaisobutyloctasilsesquioxane; D017646:Organosilicon Compounds; D011437:Propylamines; D012821:Silanes; C477625:amino-propyl-triethoxysilane