235695

Octamethylcyclotetrasiloxan

98%

• Synonym(e): 2,2,4,4,6,6,8,8-Octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane, octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane
• Lineare Formel: [-Si(CH₃)₂O-]₄
• CAS-Nummer: 556-67-2
• Molekulargewicht: 296.62
• Beilstein: 1787074
• EG-Nummer: 209-136-7
• MDL-Nummer: MFCD00003269
• UNSPSC-Code: 12352103
• PubChem Substanz-ID: 24853994
• NACRES: NA.23

Eigenschaften

• Dampfdichte: 1 (vs air)
• Assay: 98%
• Form: liquid
• Brechungsindex: n20/D 1.396 (lit.)
• bp: 175-176 °C (lit.)
• mp (Schmelzpunkt): 17-18 °C (lit.)
• Dichte: 0.956 g/mL at 25 °C (lit.)
• SMILES String: C[Si]1(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O1
• InChI: 1S/C8H24O4Si4/c1-13(2)9-14(3,4)11-16(7,8)12-15(5,6)10-13/h1-8H3
• InChIKey: HMMGMWAXVFQUOA-UHFFFAOYSA-N

Beschreibung

Allgemeine Beschreibung

Octamethylcyclotetrasiloxane (D4) is a volatile methylsiloxane (VMS) with a relatively low molecular weight. This silicone fluid has a silicon-oxygen bond in a cyclic arrangement and methyl groups are attached to the silicon atom. D4 can be used in the manufacture of silicone based polymers for use in medical devices and personal care products.

Anwendung

D4 can be polymerized through ring opening mechanism with a rare earth solid super acid as a catalyst for potential usage in the synthesis of vinyl coated polydimethylsiloxane (PDMS). It may also be used as a probe liquid for nuclear magnetic resonance cryoporometry (NMRC) to analyze the pore size distribution (PSD) of oil-bearing tight sandstone. Chemical vapor deposition (CVD) of D4 may be utilized for the preparation of siloxane based thin films.

Sicherheitshinweise

• Piktogramme: GHS02,GHS08,GHS09
• Signalwort: Warning
• H-Sätze: H226,H361f,H410
• P-Sätze: P202 - P210 - P233 - P240 - P273 - P308 + P313
• Gefahreneinstufungen: Aquatic Acute 1 - Aquatic Chronic 1 - Flam. Liq. 3 - Repr. 2
• Lagerklassenschlüssel: 3 - Flammable liquids
• WGK: WGK 3
• Flammpunkt (°F): 123.8 °F - closed cup
• Flammpunkt (°C): 51 °C - closed cup
• Persönliche Schutzausrüstung: Eyeshields, Gloves, type ABEK (EN14387) respirator filter