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Name: 1,1,3,3-Tetraethoxy-1,3-dimethyldisiloxane   

CAS NO: 18001-60-0

Purity: 97% min

MF: C10H26O5Si2

MW:282.481

BP:227.4±23.0 °C at 760 mmHg

Density:1.0±0.1 g/cm3

MP: N/A

EINECS:241-915-7

Appearance: Colorless Transparent Liquid

Package: 25g, 100g, 500g, bulk package

Application:Organic Synthesis intermediate

Other name:

[diethoxy(methyl)silyl]oxy-diethoxy-methylsilane;

1,2-Dimethyl-1,1,2,2-tetraethoxydisiloxan;

Disiloxane, 1,1,3,3-tetraethoxy-1,3-dimethyl-;

Hybrid silica membranes were prepared using 1,1,3,3-tetraethoxy-1,3-dimethyldisiloxane (TEDMDS) CAS NO: 18001-60-0  as a silica precursor. Hybrid silica sol was synthesized by the acetic acid catalyzed hydrolysis and condensation of TEDMDS ,CAS NO: 18001-60-0  in ethanol as a solvent with different water molar ratio. Porous silica membranes were fabricated by coating the TEDMDS-derived hybrid silica sol, followed by drying and firing at 300°C or 450°C in nitrogen atmosphere. Single gas permeation characteristic of He, H2,N2, and SF6 through TEDMDS CAS NO: 18001-60-0  derived silica membranes were measured at 200°C. It was found that TEDMDS-derived silica membranes had loose amorphous structure than TEOS-derived silica membranes. TEDMDS CAS NO: 18001-60-0  derived silica membrane fired at 300°C using TEDMDS/H2O = 1/20 sol showed H2 permeance of 2.05 x 10?6 m3 m?2 s?1 kPa?1 with H2/SF6 selectivity of 260°C at 200°C. The water contact angles of TEDMDS-derived silica film were constant even after kept in humid atmosphere (60 RH%,40°C) for about 35 d, suggesting a hydrophobic property due to the presence of CH3 groups.

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