CAS 5157-75-5

Octadecylmethyldichlorosilane

Description:

Octadecylmethyldichlorosilane, with the CAS number 5157-75-5, is an organosilicon compound characterized by its long hydrophobic alkyl chain, which consists of 18 carbon atoms. This structure imparts significant hydrophobic properties, making it useful as a surface modifier in various applications, including coatings and adhesives. The presence of dichlorosilane functional groups allows for the formation of siloxane bonds with surfaces, enhancing adhesion and providing water-repellent characteristics. Typically, it appears as a colorless to pale yellow liquid and has a relatively low volatility. Its reactivity is primarily due to the chlorosilane groups, which can hydrolyze in the presence of moisture, leading to the formation of silanol groups and subsequent polymerization. This compound is often utilized in the modification of silica and other inorganic surfaces to improve their compatibility with organic materials. Safety precautions should be taken when handling this substance, as it can be corrosive and may pose health risks if inhaled or in contact with skin.

Formula: C₁₉H₄₀Cl₂Si

InChI: InChI=1S/C19H40Cl2Si/c1-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19-22(2,20)21/h3-19H2,1-2H3

InChI key: InChIKey=GYWBHBXGYTYXRG-UHFFFAOYSA-N

SMILES: C(CCCCCCCCCCCCCCC)CC[Si](C)(Cl)Cl

Synonyms:

• Ai3-60187
• Dichloromethylstearylsilane
• Methyloctadecyldichlorosilane
• N-octadecylmethyldichlorosilane
• NSC 96645
• Octadecyldichloromethylsilane
• Octadecylmethyldichlorosilane
• Silane, dichloromethyloctadecyl-
• Stearylmethyldichlorosilane
• Dichloromethyloctadecylsilane
• Dichloromethyloctadecylsilane

DICHLORO-METHYL-OCTADECYLSILANE

CAS: 5157-75-5

Formula: C₁₉H₄₀Cl₂Si

Purity: %

Molecular weight: 367.5124

Ref: IN-DA003PDT

Dichloro(Methyl)(Octadecyl)Silane

CAS: 5157-75-5

Dichloro(Methyl)(Octadecyl)Silane

Purity: 99%

Molecular weight: 367.51g/mol

Ref: 54-OR1029957

Dichloro(methyl)octadecylsilane

CAS: 5157-75-5

Formula: C₁₉H₄₀Cl₂Si

Purity: >94.0%(GC)

Color and Shape: White or Colorless to Almost white or Almost colorless powder to lump to clear liquid

Molecular weight: 367.51

Ref: 3B-O0264

Methyl-n-octadecyldichlorosilane

CAS: 5157-75-5

Purity: 95%

Color and Shape: Solid, Low Melting Solid

Molecular weight: 367.510009765625

Ref: 10-S11425

n-OCTADECYLMETHYLDICHLOROSILANE

CAS: 5157-75-5

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-Octadecylmethyldichlorosilane; Dichloromethyl-n-octadecylsilane; Methyldichlorosilyloctadecane; Dichloromethylsilyloctadecane
Contains 5-10% C18 isomersViscosity: 7 cSt

Formula: C₁₉H₄₀Cl₂Si

Purity: 97% including isomers

Color and Shape: Straw Liquid

Molecular weight: 367.52

Ref: 3H-SIO6625.0

Dichloro(methyl)octadecylsilane

CAS: 5157-75-5

Dichloro(methyl)octadecylsilane is a liquid that is used to coat the inside of tubes in chromatographic columns. The coating ensures that the stationary phase (the material on which the analyte travels) remains stationary and is not carried away with the mobile phase. It has been shown to be effective at removing hydrogen chloride from water and can be used as a fabricating agent for coatings. Dichloro(methyl)octadecylsilane is used in analytical chemistry, where it has been shown to have a number of uses including being able to remove hydroxy groups from molecules and electron microscopy, where it can be used as a coating for nonpolar solvents.

Purity: Min. 95%

Ref: 3D-FD62732

n-OCTADECYLMETHYLDICHLOROSILANE, 97%

CAS: 5157-75-5

Formula: C₁₉H₄₀Cl₂Si

Purity: 97% including isomers

Color and Shape: Straw Liquid

Molecular weight: 367.52

Ref: 3H-SIO6625.1