CAS 107-51-7 Poly(dimethylsiloxane) - Materials / Alfa Chemistry

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Poly(dimethylsiloxane)

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Catalog Number

ACM107517-1

CAS Number

107-51-7

Product Name

Poly(dimethylsiloxane)

Category

Salt; Bioelectronic Materials

Synonyms

Octamethyltrisiloxane

Description

Poly(dimethylsiloxane) (PDMS), also known as dimethicone, is an organosilicon compound that is widely used as a siloxane based elastomer. It is a hydrophobic material with attractive physical and chemical properties such as elasticity, optical transparency, tunable surface chemistry, and low electrical conductivity.

IUPAC Name

dimethyl-bis(trimethylsilyloxy)silane

Molecular Weight

236.53

Molecular Formula

[(CH3)3SiO]2Si(CH3)2

Canonical SMILES

C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C

InChI

1S/C8H24O2Si3/c1-11(2,3)9-13(7,8)10-12(4,5)6/h1-8H3

InChI Key

CXQXSVUQTKDNFP-UHFFFAOYSA-N

Boiling Point

153 °C (lit.)

Melting Point

-82 °C (lit.)

Density

0.82 g/mL at 25 °C (lit.)

Solubility

1.44e-07 M;Immiscible with water;Immiscible with alcohol;Miscible with chloroform; soluble in chlorinated hydrocarbons, benzene, toluene, xylene, n-hexane, petroleum spirits, ether, amyl acetate; very slightly soluble in isopropyl alcohol; insoluble in methanol, acetone

Application

Poly(dimethylsiloxane) serves as a versatile compound with a wide range of applications due to its unique chemical properties. It is most commonly used as an antifoaming agent in various industrial processes and consumer products. In the food industry, it effectively prevents foaming and spattering in heated oils and minimizes foam formation during the production of wine, refined sugar, gelatin, and chewing gum. Its role in medical applications is also significant, being used extensively in prostheses like breast implants because of its low toxicity profile, as demonstrated by animal testing. Additionally, when combined with silica gel to form simethicone, it alleviates bloating by reducing gas bubble surface tension in the digestive system, making it a common ingredient in antacids and treatments for infant colic. Overall, poly(dimethylsiloxane) exemplifies the valuable characteristics of silicones, providing practical solutions across various sectors.

Color/Form

Colorless oil;Clear colorless liquids

Complexity

149

Covalently-Bonded Unit Count

EC Number

203-497-4;613-156-5;618-433-4

Exact Mass

236.10841g/mol

Formal Charge

Heavy Atom Count

Log P

6.6 (LogP)

MeSH Entry Terms

dimethicone;dimethyl polysiloxane;dimeticone

Monoisotopic Mass

236.10841g/mol

Other Experimental

Silcone oil consisting of dimethylsiloxane polymers range in viscosities from 0.65-1,000,000 centistokes at room temp;Low surface tension, inert /Silicones/;Index of refraction: 1.4013 to 1.4053 at 35 °C; viscosity at 25 °C: 350 cSt; density: 0.965-0.973 /Dimethicone 350/;Viscosity: 41 cSt at 37.8 °C /Silicone fluid with 10 mm sq/S viscosity/;DIMETHYLPOLYSILOXANES ARE PRACTICALLY INERT POLYMERS

Packaging

50 mL in glass bottle

Refractive Index

n20/D 1.384 (lit.)

Rotatable Bond Count

Stability

Stable to heat and ... resistant to most chemical substances, although they are affected by strong acids.

UNII

9G1ZW13R0G

Vapor Density

Pour point -73 °C; Electric Strength 1.4 KV/um; Electric Constant 2.60; Thermal conductivity at 65 °C = 1.3 W/(m.k). /Silicone fluid with 10 mm sq/5 viscosity/

Vapor Pressure

3.34 mmHg

Viscosity

1.0 cSt(25 °C)

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