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Poly(methylhydrosiloxane)

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Poly(methylhydrosiloxane) Basic information

Product Name:
Poly(methylhydrosiloxane)
Synonyms:
  • DOW CORNING 1107 WATER REPELLENT AND POWDER TREATMENT
  • Poly(methylhydrosiloxane)
  • POLYMETHYLHYDROSILOXANE, TRIMETHYLSILYL TERMINATED, 15-25cs
  • POLYMETHYLHYDROSILOXANE, TRIMETHYLSILYL TERMINATED, 25-35cs
  • POLYMETHYLHYDROSILOXANE, TRIMETHYLSILYL TERMINATED, 35-45cs
  • Hydrosilicone oil
  • Methylhydrogensiloxane polymer, PMHS
  • Poly(methylhydrosiloxane-co-dimethylsiloxane)
CAS:
63148-57-2
MF:
C7H22O2Si3
MW:
222.5
EINECS:
613-152-3
Product Categories:
  • Silicone Series
  • Silane series
  • PDMS Elastomers/ResinsPolymer Science
  • Polysiloxanes
  • Self Assembly&Contact Printing
  • Silicones
  • Stamps for Nanoprint Lithography&Microcontact Printing
Mol File:
63148-57-2.mol
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Poly(methylhydrosiloxane) Chemical Properties

Melting point:
<-60°C
Boiling point:
142 °C(lit.)
Density 
1.006 g/mL at 25 °C (lit.)
vapor pressure 
38 hPa (20 °C)
refractive index 
n20/D 1.382(lit.)
Flash point:
204 °C
storage temp. 
Store below +30°C.
solubility 
Soluble in most ethereal, chlorinated, or hydrocarbon solvents as well as EtOH, i-PrOH, warm DMF, and warm NMP; insoluble in MeOH, DMSO, acetonitrile, and water
Specific Gravity
0.98
PH
7 (H2O)
Water Solubility 
Not miscible or difficult to mix in water.
CAS DataBase Reference
63148-57-2
EPA Substance Registry System
Siloxanes and Silicones, Me hydrogen (63148-57-2)
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Safety Information

Hazard Codes 
Xi
Risk Statements 
10-36/37/38
Safety Statements 
26-36-24/25-23-16
WGK Germany 
3
10-21
TSCA 
Yes
HS Code 
39100000

MSDS

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Poly(methylhydrosiloxane) Usage And Synthesis

Handing storage

Stable to air and moisture; incompatible with strong acids, bases, or oxidants (forms hydrogen upon decomposition); generally considered non-toxic, however thorough toxicity studies have not been performed; skin/eye contact and inhalation should be avoided.

Description

Poly(methylhydrosiloxane) is a reducing agent. For example, it can be used for the reduction of esters to alcohols as well as the reduction of aldehydes and ketone. It can also be used for the reduction of phosphine oxides to phosphine. Recent study has also used it for conjugate reduction of α, β-Unsaturated Carbonyl and Carboxyl Compounds. Finally, it is also used in greener amine synthesis mediated by reductive amination which is an alternative to borohydrides.

Chemical Properties

Colorless liquid

Uses

Polymethylhydrosiloxane(PMHS) is an easily handled,inexpensive,non-toxic,and mild reducing agent. PMHS is attractive as a substitute for more expensive or hazardous silanes or siloxanes and as the stoichiometric reductant in catalytic organotin-mediated processes. It can be cross linked by metal catalyst at low temperature to form waterproof membrane. It is used as waterproof agent of textile, glass, pottery, paper, leather, metal, cement and marble etc, especially in textile waterproof. It is used as insulator and cross linker of paper. Poly(methylhydrosiloxane) is used in the reduction of esters to alcohols, catalyzed by a combination of titanocene dichloride and either n-BuLi or EtMgBr. It is a safer alternative to triethoxysilane, B22063, for reduction of phosphine oxides to phosphines, catalyzed by Ti(O-i-Pr)4. It is also used in greener amine synthesis by reductive amination as an alternative to borohydrides.

Preparation

Poly(methylhydrosiloxane) is prepared by hydrolysis of methyldichlorosilane followed by heating (60–150℃) the resultant mixture of cyclic silanes in the presence of hexamethyldisiloxane generates the linear polysiloxane.

General Description

We are committed to bringing you Greener Alternative Products, which adhere to one or more of The 12 Principles of Greener Chemistry. This product is an environmentally benign reducing agent and has been enhanced for catalytic efficiency. Click here for more information.
Harnessing the reactivity of poly(methylhydrosiloxane) for the reduction and cyclization of biomass to high-value products

Synthesis

Poly(methylhydrosiloxane)(PMHS) is synthesized by the controlled hydrolysis of MeSiHCl2[1]

Advantages

PMHS is synthesized by the controlled hydrolysis of MeSiHCl2, a byproduct in producing Me2SiCl2, a feedstock for the silicone industry. As a byproduct of the silicone industry, it is a cheap, easy to handle, and environmentally friendly reducing agent. PMHS is more air and moisture-stable than other silanes and can be stored for long periods of time without loss of activity. In addition to being synthesized from a waste product, PMHS is cheap, stable to air and moisture, and is considered nontoxic[2].

References

[1] HEIN N M, SEO Y, LEE S J, et al. Harnessing the reactivity of poly(methylhydrosiloxane) for the reduction and cyclization of biomass to high-value products?[J]. Green Chemistry, 2019, 10: 2662-2669. DOI:10.1039/C9GC00705A.
[2] Hein, Nicholas M. et al. “Harnessing the reactivity of poly(methylhydrosiloxane) for the reduction and cyclization of biomass to high-value products?.” Green Chemistry 10 (2019): 2662–2669.

Poly(methylhydrosiloxane) Preparation Products And Raw materials

Preparation Products

Poly(methylhydrosiloxane)Supplier

Jinan Longcheng Silicone Co., Ltd Gold
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15688582836
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