𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Sol–gel formation of heteropolysiloxanes from diethylphosphatoethyltriethoxysilane and tetraethoxysilane

✍ Scribed by Antonio Cardenas; Nadine Hovnanian; Monique Smaihi

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
740 KB
Volume
60
Category
Article
ISSN
0021-8995

No coin nor oath required. For personal study only.

✦ Synopsis

Transparent monolithic gels were prepared from the cohydrolysis of diethylphosphatoethyltriethoxysilane (OC2H5)2P(0)CH2CH2Si(OCzH5)3 (Sip) and tetraethoxysilane Si(OC,H5), (TEOS) in various ratios, under acidic conditions. The hydrolysis and initial polycondensation of Sip were studied by high-resolution "Si-NMR. Based on signal intensities, signals due to the following oligomers were identified R(OH),SiOSi(OH)(R) OSi(OH),, R(OH),SiOSi(OH),, R(OH)(OEt)SiOSi(OH),R, R(OH)(OEt)SiOSi(OH),R, R(OH),SiOSi(OH)(R)OSi(OH),R and [R(OH)SiO-] "Si NMR quantitative analysis was performed on SIP-TEOS mixtures during the hydrolysis-condensation reactions and on the final gels. This provided information on the formation of the gels molecular structure.

📜 SIMILAR VOLUMES

Hybrid sol–gel membranes of polyacryloni
Hybrid sol–gel membranes of polyacrylonitrile–tetraethoxysilane composites for gas permselectivity
✍ Minoru Iwata; Takeharu Adachi; Miwa Tomidokoro; Michiyoshi Ohta; Takaomi Kobayas 📂 Article 📅 2003 🏛 John Wiley and Sons 🌐 English ⚖ 529 KB

## Abstract Sol–gel reaction of tetraethoxysilane (TEOS) with fumed silica–polyacrylonitrile (PAN) membrane was carried out to prepare hybrid gas permeable membranes for oxygen and nitrogen separation. Various amounts of fumed silica microparticles with a few μm diameters were compounded in PAN–dim

Sol state formation and melting of agar
Sol state formation and melting of agar gels rheological study
✍ Kh. Lahrech; A. Safouane; J. Peyrellasse 📂 Article 📅 2005 🏛 Elsevier Science 🌐 English ⚖ 223 KB

The effect of temperature and molecular weight, on the conformational properties of agar aqueous solutions is reported. Equations of the viscosity agar solutions for different concentrations, and molecular weight, are given. The thermoreversible sol gel transition in agar gel is studied by small def

Effect of silica reinforcement on natura
Effect of silica reinforcement on natural rubber and butadiene rubber vulcanizates by a sol–gel reaction with tetraethoxysilane
✍ Kyong-Hwan Chung 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 225 KB 👁 2 views

## Abstract The effect of silica reinforcement was studied for natural rubber (NR) and butadiene rubber (BR) vulcanizates by a sol–gel reaction with tetraethoxysilane at different temperatures. The formation of silica in the rubber vulcanizates was investigated analytically with Fourier transform i