Octaphenylcyclotetrasiloxane Chemical Properties

Melting point:

196-198 °C(lit.)

Boiling point:

334 °C

Density 

1.185

vapor pressure 

0Pa at 25℃

refractive index 

1.62

Flash point:

200 °C

storage temp. 

Storage temp. 2-8°C

solubility 

very faint turbidity in Toluene

form 

solid

Specific Gravity

1.185

color 

White to Almost white

Water Solubility 

insoluble

Hydrolytic Sensitivity

1: no significant reaction with aqueous systems

BRN 

2320758

LogP

9 at 20℃

CAS DataBase Reference

546-56-5(CAS DataBase Reference)

NIST Chemistry Reference

Octaphenylcyclotetrasiloxane(546-56-5)

EPA Substance Registry System

Cyclotetrasiloxane, octaphenyl- (546-56-5)

Safety Information

Safety Statements 

22-24/25

WGK Germany 

1

RTECS 

GZ4398500

TSCA 

Yes

HS Code 

29319090

MSDS

• Language:English Provider:Octaphenylcyclotetrasiloxane
• Language:English Provider:SigmaAldrich
• Language:English Provider:ACROS
• Language:English Provider:ALFA

Octaphenylcyclotetrasiloxane Usage And Synthesis

Application

Octaphenylcyclotetrasiloxane can be physically blended into antifouling coatings in monomer form to reduce the surface energy of the coating, increase the flexibility of the film, and also act as an antifoaming agent. An example of its application is as follows: A heat-dissipating coating is composed of the following raw material components in parts: 100-150 parts polyvinyl chloride, 78-80 parts polyether polyol, 80-85 parts polymethyl methacrylate, 55-80 parts polytetrafluoroethylene, 65-70 parts polyisoprene, 80-90 parts polypropylene, 6-10 parts alumina, 6-8 parts magnesium oxide, 4-6 parts octaphenylcyclotetrasiloxane, 6-8 parts sodium thiosulfate, and 7-9 parts dodecyl diisocyanate. The composition includes: methylamine acetylacetonate, 4-6 parts yttrium acetylacetonate, 5-8 parts 2-thiophenecarboxyltrifluoroacetone, 6-8 parts methyl methacrylate, 6-8 parts dibutyltin dilaurate, 8-10 parts quartz powder, 8-10 parts silica powder, 8-12 parts silica, 7-9 parts n-butanol, 3-5 parts dimethyl carbonate, 2-4 parts p-phenylenediamine, 3-5 parts stearoylbenzoylmethane, 4-5 parts triethyl phosphite, 8-10 parts titanium dioxide, and 12-15 parts bentonite. This invention's heat-dissipating coating exhibits excellent heat dissipation, good adhesion, strong stability, and is safe and free of toxic side effects.

Chemical Properties

Octaphenylcyclotetrasiloxane (OPCTS) is a white solid. It can be used for synthesizing pharmaceutical intermediates and organic silicone intermediates, especially for high temperature resistant phenyl silicone oil and other polymers.

Preparation

Octaphenylcyclotetrasiloxane is typically produced industrially by one of two processes: 1) the hydrolysis of diphenyldichlorosilane or 2) the hydrolysis of diphenyldialkoxysilanes.
Process the production of octaphenylcyclotetrasiloxane

Flammability and Explosibility

Not classified

Purification Methods

Recrystallise it from AcOH, EtOAc, *C6H6 or *C6H6/EtOH. It forms two stable isomorphs and both forms, as well as the mixture, melt at 200-201o. There is a metastable form which melts at 187-189o. [Burkhard et al. J Am Chem Soc 67 2174 1945, Hyde et al. J Am Chem Soc 69 488 1947, Beilstein 16 IV 1530.]

Octaphenylcyclotetrasiloxane(546-56-5)Related Product Information

• DIPHENYLCYCLOPROPENONE
• 1,1,3,3,5,5-hexamethyl-1,3,5-trisilacyclohexane
• Octamethylcyclotetrasiloxane
• Cyclohexylbenzene
• 1,1,3,3-Tetramethyldisiloxane
• DODECAMETHYLCYCLOHEXASILOXANE
• Hexamethylcyclotrisiloxane
• Bromoxynil octanoate
• 1,8-Octanedinitrile
• Silicone oil
• 1,1,3,3-TETRAMETHYLDISILOXANE
• Diphenylsilanediol
• 1,1,3,3-Tetramethyltetraphenylcyclotetrasiloxane
• Phenylsilane
• heptamethylphenylcyclotetrasiloxane
• 3-PHENYL-1,1,3,5,5-PENTAMETHYLTRISILOXANE
• 2,4,6,8-Tetramethylcyclotetrasiloxane
• 1,1,3,3,5,5-HEXAMETHYLTRISILOXANE