Glow discharge polymerization of reactive functional silanes on poly(methyl methacrylate)

Abstract

SynopsisGlow discharge polymerization among such reactive functional silanes as 3-methacryloxypropyltrimethoxysilane (MSL), 3-glycidoxypropyltrimethoxysilane (ESL), and vinyltrimethoxysilane (VSL) on poly (methyl methacrylate) was investigated by means of Fourier transform infrared spectroscopy, ESCA analysis, and contact angle measurement. Flow rate of monomer influenced both polymer deposition rate and polymer elemental composition. Infrared spectra showed differences in chemical structure among the polymers prepared from the different silanes. All of the polymers obtained contained similar chemical groups such as -CH,, -CH,-, Si-0-Si , and Si-0-C . Polymers deposited from MSL and ESL contained highly hydrophilic functional groups like C-OH, Si-OH, and C=O on the uppermost layer while that from VSL contained highly hydrophobic functional groups like -CH, groups. Chemical analysis by ESCA and contact angle measurement gave evidence for the similarity of the polymers prepared from MSL and ESL, in contrast with the differences of the polymers prepared from VSL.

X-Ray Photoelectron Spectroscopy for Characterization of Engineered Elastomer Surfaces

“…The decrease in water CA in [1] was caused by thermooxidation of initially hydrophobic methyl-terminated surface of EPDM. This process was accompanied by an arrangement of polar oxygen functional groups (-C-OH, -C=O) on the outer surface layer [1,2]. In case of frictional surfaces, no oxidation of the elastomer backbone could be found from XPS spectra.…”

“…Properties of elastomer surfaces depend, to a large degree, on the chemical constitution of molecules in the surface layer [2]. Therefore, tailoring polymer surfaces has attracted much interest of researchers in polymer chemistry [3].…”

Dendrimer-Stabilized Ru Nanoparticles Immobilized in Organo-Silica Materials for Hydrogenation of Phenols

“…Herein the sol-gel method allows diffusion limitations to be avoided, inevitable, when bulky dendrimer or dendron is anchored to the surface of ready carrier [64][65][66][67][68][69]. The materials obtained were characterized by infrared spectroscopy (IR), X-ray photoelectron spectroscopy (XPS) and solid-state nuclear magnetic resonance (NMR) spectroscopy, that confirmed the presence in their structures of fragments, inherent in the SiO 2 bulk support [74,75] [76][77][78][79][80].…”

“…Microporous dendr-G3-SiO2 (Figure 2 The materials obtained were characterized by infrared spectroscopy (IR), X-ray photoelectron spectroscopy (XPS) and solid-state nuclear magnetic resonance (NMR) spectroscopy, that confirmed the presence in their structures of fragments, inherent in the SiO2 bulk support [74,75], PPI dendrimers (NCH2CH2CH2N, NCH2CH2CH2NH2, etc.) [76] and modifying groups, that link the former two residues, include epoxide-opening products of the former glycidyl groups (SiCH2CH2CH2O, OCH2CH(OH)CH2NH) [76][77][78][79][80].…”

“…within, appears to be quite rigid, and Ru nanoparticles, when impregnated inside, cannot cause any sufficient changes in it, which may be reflected in the NMR spectrum. As seen from XPS data ( Table 1, Figures S5 and S6), metals in catalysts synthesized are presented in both zero-valent (Ru 0 [89], Ru/RuOx [89]) and oxidized states (RuO2 [90], RuO3 [91], RuCl2 [92], RuCl3 [80]). Herein we suppose interaction of Ru nanoparticles with silica walls is minimal due to the preferential stabilization of the former by numerous aminogroups of PPI dendrimers inside pores, within, appears to be quite rigid, and Ru nanoparticles, when impregnated inside, cannot cause any sufficient changes in it, which may be reflected in the NMR spectrum.…”