CAS 3069-42-9

Octadecyltrimethoxysilane

Description:

Octadecyltrimethoxysilane, with the CAS number 3069-42-9, is an organosilane compound characterized by its long hydrophobic alkyl chain and three methoxy groups attached to a silicon atom. This structure imparts unique properties, making it an effective silane coupling agent and surface modifier. It is typically a colorless to pale yellow liquid with a relatively low viscosity. The presence of the long octadecyl chain enhances its hydrophobicity, allowing it to form self-assembled monolayers on various substrates, which can improve surface properties such as water repellency and chemical resistance. Octadecyltrimethoxysilane is commonly used in applications such as coatings, adhesives, and sealants, as well as in the modification of silica and other inorganic materials to enhance compatibility with organic polymers. Additionally, it can facilitate the bonding of organic materials to inorganic surfaces, making it valuable in various industrial and research applications. Proper handling and storage are essential, as it can react with moisture, leading to the release of methanol.

Formula: C₂₁H₄₆O₃Si

InChI: InChI=1S/C21H46O3Si/c1-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19-20-21-25(22-2,23-3)24-4/h5-21H2,1-4H3

InChI key: InChIKey=SLYCYWCVSGPDFR-UHFFFAOYSA-N

SMILES: [Si](CCCCCCCCCCCCCCCCCC)(OC)(OC)OC

Synonyms:

• Ay 43-218Mc
• Dynasylan 9118
• Kh 311
• Lsx 6817
• M 1 (silane)
• O 0256
• Octadecyltrimethoxysilane
• Silane, trimethoxyoctadecyl-
• Stearyltrimethoxysilane
• Tsl 8185
• Tsl 8186
• n-Octadecyltrimethoxysilane
• Trimethoxyoctadecylsilane

Octadecyltrimethoxysilane

CAS: 3069-42-9

Formula: C₂₁H₄₆O₃Si

Purity: >85.0%(GC)

Color and Shape: White or Colorless to Light yellow powder to lump to clear liquid

Molecular weight: 374.68

Ref: 3B-O0256

Octadecyltrimethoxysilane

CAS: 3069-42-9

Formula: C₂₁H₄₆O₃Si

Purity: 90%

Color and Shape: Liquid

Molecular weight: 374.6736

Ref: IN-DA003V33

Trimethoxy(octadecyl)silane

CAS: 3069-42-9

Trimethoxy(octadecyl)silane

Formula: C₂₁H₄₆O₃Si

Purity: tech

Color and Shape: clear. almost colourless low melting solid or liquid

Molecular weight: 374.67364g/mol

Ref: 54-OR55171

Octadecyltrimethoxysilane (High Purity)

CAS: 3069-42-9

Formula: C₂₁H₄₆O₃Si

Purity: >99.0%(GC)

Color and Shape: Colorless to Light yellow clear liquid

Molecular weight: 374.68

Ref: 3B-O0708

Octadecyltrimethoxysilane (>85%)

Controlled Product

CAS: 3069-42-9

Applications OCTADECYLTRIMETHOXYSILANE (cas# 3069-42-9) is a useful research chemical.

Formula: C₂₁H₄₆O₃Si

Purity: >85%

Color and Shape: Neat

Molecular weight: 374.67

Ref: TR-O148538

n-OCTADECYLTRIMETHOXYSILANE

CAS: 3069-42-9

Alkyl Silane - Conventional Surface Bonding
Aliphatic, fluorinated aliphatic or substituted aromatic hydrocarbon substituents are the hydrophobic entities which enable silanes to induce surface hydrophobicity. The organic substitution of the silane must be non-polar. The hydrophobic effect of the organic substitution can be related to the free energy of transfer of hydrocarbon molecules from an aqueous phase to a homogeneous hydrocarbon phase. A successful hydrophobic coating must eliminate or mitigate hydrogen bonding and shield polar surfaces from interaction with water by creating a non-polar interphase. Although silane and silicone derived coatings are in general the most hydrophobic, they maintain a high degree of permeability to water vapor. This allows coatings to breathe and reduce deterioration at the coating interface associated with entrapped water. Since ions are not transported through non-polar silane and silicone coatings, they offer protection to composite structures ranging from pigmented coatings to rebar reinforced concrete. A selection guide for hydrophobic silanes can be found on pages 22-31 of the Hydrophobicity, Hydrophilicity and Silane Surface Modification brochure.
n-Octadecyltrimethoxysilane; Trimethoxyoctadecylsilane; Trimethoxysilyloctadecane
Contains 5-10% C18 isomersMelting point: 13-17 °C (55-63 °F)Forms hydrophobic, oleophilic coatingsForms clear, ordered films with tetramethoxysilaneUndergoes oscillatory adsorption to form SAMsTrialkxoy silane

Formula: C₂₁H₄₆O₃Si

Purity: 92% including isomers

Color and Shape: Straw Liquid

Molecular weight: 374.68

Ref: 3H-SIO6645.0

n-Octadecyltrimethoxysilane, includes up to 5-10% C18 Isomers

CAS: 3069-42-9

S12325 - n-Octadecyltrimethoxysilane, includes up to 5-10% C18 Isomers

Formula: C₂₁H₄₆O₃Si

Purity: 95%

Color and Shape: Clear to straw liquid

Molecular weight: 374.681

Ref: 10-S12325