Surface-Deposited Acid/Base on Glass Microfibers in Formation of (3-Aminopropyl)triethoxysilane-[2-(3,4-epoxycyclohexyl)ethyl]heptaisobutyl- octasilsesquioxane Bioverlay

Abstract

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.

Mechanical behaviour and practical adhesion at a bamboo composite interface: Physical adhesion and mechanical interlocking

“…For the case of clean glass fibres, the O/Si and C/Si ratios correspond well with those reported in literature for glass fibres [29]. It can be seen (Table 2) that glass fibres have a higher basic component that bamboo fibres.…”

Assembling strategy to synthesize palladium modified kaolin nanocomposites with different morphologies

“…Moreover, the high-resolution N 1s fitted XPS spectra exhibited a lower binding energy of about 399.7 eV, may be ascribed to amide groups ( Fig. 3d ) 25 29 , which could provide quantitative information about the functional groups based on the peak area. Pd-TK@APTES grafted the highest amount of functional groups than Pd-FK@APTES and Pd-RK@APTES, which was also consistent with the ICP-AES results ( Table 1 ).…”

Recent Developments in the Chemistry of Cubic Polyhedral Oligosilsesquioxanes

“…The use of a variety of other POSS monomers in the preparation of epoxide-derived nanocomposites has also been reported. These include the derivatives T 8 [CH 2 CH(O)CH 2 ] 8 , ,, T 8 [CH 2 CH(O)CH-Ph] 8 , T 8 [OSiMe 2 CH 2 CH(O)CH 2 ] 8 , T 8 [OSiMe 2 (CH 2 ) 4 CH(O)CH 2 ] 8 , ,, T 8 (R) 7 CH 2 CH(O)CH 2 (R = i -Bu or c- C 5 H 9 ), , 189 and 190 (Chart ), ,,, T 8 ( c- C 5 H 9 ) 7 OSiMe 2 (CH 2 ) 3 OCH 2 CH(O)CH 2 , T 8 Ph 7 (CH 2 ) 3 OCH 2 CH(O)CH 2 , ,,,, T 8 (OSiMe 2 C 5 H 11 ) 6 [OSiMe 2 (CH 2 ) 4 CH(O)CH 2 ] 2 , , T 8 [CH(O)CH 2 ] 6 (CHCH 2 ) 2 , and T 8 (OSiMe 2 C 5 H 11 ) 4 [OSiMe 2 (CH 2 ) 4 CH(O)CH 2 ] 4 . , …”