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.
Tishchenko
Galina A
GA
Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic. tiscenko@imc.cas.cz
Brus
Jirí
J
Dybal
Jirí
J
Pekárek
Michal
M
Sedláková
Zdenka
Z
Bleha
Miroslav
M
Bastl
Zdenek
Z
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