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| | Methyltrimethoxysilane Basic information |
| | Methyltrimethoxysilane Chemical Properties |
| Melting point | <-70°C | | Boiling point | 102-104 °C(lit.) | | density | 0.955 g/mL at 25 °C(lit.) | | vapor pressure | 2990 hPa (20 °C) | | refractive index | n20/D 1.371(lit.) | | Fp | 52 °F | | storage temp. | Store below +30°C. | | form | liquid | | Specific Gravity | 0.955 | | color | colorless | | Water Solubility | decomposes | | Sensitive | Moisture Sensitive | | Hydrolytic Sensitivity | 7: reacts slowly with moisture/water | | BRN | 1736151 | | Stability: | Stable, but moisture sensitive. Highly flammable. Incompatible with water, strong acids, strong oxidizing agents. | | InChIKey | BFXIKLCIZHOAAZ-UHFFFAOYSA-N | | LogP | -2.4-0.7 at 20℃ | | CAS DataBase Reference | 1185-55-3(CAS DataBase Reference) | | NIST Chemistry Reference | Silane, trimethoxymethyl-(1185-55-3) | | EPA Substance Registry System | Trimethoxymethylsilane (1185-55-3) |
| Hazard Codes | F,Xi | | Risk Statements | 11-43 | | Safety Statements | 16-24 | | RIDADR | UN 1993 3/PG 2 | | WGK Germany | 3 | | RTECS | VV4650000 | | Autoignition Temperature | 225 °C | | TSCA | Yes | | HazardClass | 3 | | PackingGroup | II | | HS Code | 29310095 | | Toxicity | LD50 orally in Rabbit: 11808 mg/kg LD50 dermal Rabbit > 9600 mg/kg |
| | Methyltrimethoxysilane Usage And Synthesis |
| Description | Trimethoxy (methyl) silane is an organosilicon compound. It can be
used as a crosslinker in the preparation of polysiloxane polymers.
It can also be used as an acid scavenge used in the formation of
substituted azulenes from allenylsilanes and tropyl?ium
tetrafluoroborate. It can also be used as the precursor for
synthesis of flexible silica aerogels. | | Chemical Properties | Colorless clear liquid | | Uses | Methyltrimethoxysilane is a reagent used in they synthesis of electronic materials and organometallic compounds. Used in the coating of carbon-fiber surfaces, as well as in the synthesis of nanocomposites. | | Uses | Methyltrimethoxysilane(MTMS) in combination with iron nitrate altered the pore structure dramatically. As the Crosslinking agent of RTV silicone rubber and glass fiber surface treatment agent and talk to agents outside of reinforced plastic laminated products in order to improve the mechanical strength, heat resistance, moisture resistance.
Methyltrimethoxysilane is used as an acid scavenger, for example in the formation of substituted azulenes from allenylsilanes and tropyl-ium tetrafluoroborate. | | Application | Methyltrimethoxysilane is highly miscible with standard organic solvents, such as alcohols, hydrocarbons and acetone. It is practically insoluble in neutral water and reacts only slowly to form silanols and higher condensation products. Addition of a hydrolytic catalyst (inorganic/organic acids, ammonia or amines) accelerates the hydrolysis of Methyltrimethoxysilane substantially.
As a Filler Modifier, Methyltrimethoxysilane is used mainly to render a wide range of surfaces and materials water repellent (e.g. mineral fillers, pigments, glass, cardboard). It may be used pure or in solution to treat fillers, using suitable mixing equipment. It may be necessary to first pre-treat the substrate with water and/or a catalyst. It is also used in the production of silicone resins and condensation-curing silicone rubber, used as an important component in sol-gel systems.
As one of the most common Alkoxy Crosslinkers, Methyltrimethoxysilane has high reactivity that precedes by nucleophilic substitution usually in the presence of acid or base catalysts. | | Preparation | Methyltrimethoxysilane is usually prepared from methyltrichlorosilane and methanol:
CH3SiCl3 + 3 CH3OH → CH3Si(OCH3)3 + 3 HCl | | General Description | Trimethoxymethylsilane (MTM) is an organosilicon compound widely used as a precursor for the preparation of silica-based materials, which finds the applications in various fields. Particularly in molecular assembly, linking nano building blocks, and selective synthesis oligosiloxane compounds. It can also be utilized as a crosslinker in the synthesis of polysiloxane polymers. | | Flammability and Explosibility | Flammable | | Purification Methods | Methyl trimethoxysilane [1185-55-3] M 136.2, b 102o/760mm, d 4 1.3687, n D 1.3711. Likely impurities are 1,3-dimethyltetramethoxy disiloxane (b 31o/1mm) and cyclic polysiloxanes, see methyl triethoxysilane. [Tamborski & Post J Org Chem 16 1400 1952, Seyferth & Rochow J Org Chem 20 250 1955, Beilstein 4 IV 4203.] | | References | https://en.wikipedia.org/wiki/Methyltrimethoxysilane https://www.alfa.com/zh-cn/catalog/B23594/
Rao, A. V., et al. "Synthesis of flexible silica aerogels using methyltrimethoxysilane (MTMS) precursor." Journal of Colloid & Interface Science 300.1(2006):279-85.
Bhagat, Sharad D., et al. "Methyltrimethoxysilane based monolithic silica aerogels via ambient pressure drying." Microporous & Mesoporous Materials 100.1–3(2007):350-355.
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| | Methyltrimethoxysilane Preparation Products And Raw materials |
| Raw materials | Methyltrichlorosilane-->1,3,5-TRIMETHYLPENTAMETHOXYTRISILOXANE, 95%-->1,1,3,5,7,7-hexamethoxy-1,3,5,7-tetramethyl-tetrasiloxane-->1,3-DIMETHYLTETRAMETHOXYDISILOXANE | | Preparation Products | Dimethoxymethylphenylsilane-->Tetramethyl orthosilicate |
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