235695

Octamethylcyclotetrasiloxane

98%

• Sinonimo/i: 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
• Formula condensata: [-Si(CH₃)₂O-]₄
• Numero CAS: 556-67-2
• Peso molecolare: 296.62
• Beilstein: 1787074
• Numero CE: 209-136-7
• Numero MDL: MFCD00003269
• Codice UNSPSC: 12352103
• ID PubChem: 24853994
• NACRES: NA.23

Proprietà

• Densità del vapore: 1 (vs air)
• Saggio: 98%
• Forma fisica: liquid
• Indice di rifrazione: n20/D 1.396 (lit.)
• P. eboll.: 175-176 °C (lit.)
• Punto di fusione: 17-18 °C (lit.)
• Densità: 0.956 g/mL at 25 °C (lit.)
• Stringa SMILE: 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; HMMGMWAXVFQUOA-UHFFFAOYSA-N

Descrizione

Descrizione generale

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.

Applicazioni

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.

Informazioni sulla sicurezza

• Pittogrammi: GHS02,GHS08,GHS09
• Avvertenze: Warning
• Indicazioni di pericolo: H226,H361f,H410
• Consigli di prudenza: P202 - P210 - P233 - P240 - P273 - P308 + P313
• Classi di pericolo: Aquatic Acute 1 - Aquatic Chronic 1 - Flam. Liq. 3 - Repr. 2
• Codice della classe di stoccaggio: 3 - Flammable liquids
• Classe di pericolosità dell'acqua (WGK): WGK 3
• Punto d’infiammabilità (°F): 123.8 °F - closed cup
• Punto d’infiammabilità (°C): 51 °C - closed cup
• Dispositivi di protezione individuale: Eyeshields, Gloves, type ABEK (EN14387) respirator filter