CAS 18643-08-8

Octadecyldimethylchlorosilane

Description:

Octadecyldimethylchlorosilane, with the CAS number 18643-08-8, is an organosilicon compound characterized by its long hydrophobic alkyl chain and a chlorosilane functional group. This compound typically appears as a colorless to pale yellow liquid and is known for its ability to form self-assembled monolayers on various substrates, making it valuable in surface modification applications. Its hydrophobic nature is attributed to the octadecyl (C18) chain, which enhances water repellency and reduces surface energy. Octadecyldimethylchlorosilane is often utilized in the production of hydrophobic coatings, as well as in the preparation of functionalized silica and other materials for use in electronics, biotechnology, and materials science. Additionally, it can react with moisture to form siloxane bonds, leading to the formation of stable silane networks. Safety precautions are necessary when handling this compound, as it can be irritating to the skin and eyes, and proper storage conditions should be maintained to prevent hydrolysis.

Formula: C₂₀H₄₃ClSi

InChI: InChI=1S/C20H43ClSi/c1-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19-20-22(2,3)21/h4-20H2,1-3H3

InChI key: InChIKey=GZGREZWGCWVAEE-UHFFFAOYSA-N

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

Synonyms:

• Chlorooctadecyldimethylsilane
• Dimethyl(octadecyl)chlorosilane
• Dimethyl(octadecyl)silyl chloride
• Dimethyl(octyldecyl)silyl chloride
• N-octadecyldimethylchlorosilane
• Octadecylchlorodimethylsilane
• Octadecyldimethylchlorosilane
• Silane, chlorodimethyloctadecyl-
• Chlorodimethyloctadecylsilane

Dimethyloctadecylchlorosilane

CAS: 18643-08-8

Formula: C₂₀H₄₃ClSi

Purity: >97.0%(T)

Color and Shape: White to Almost white powder to lump

Molecular weight: 347.10

Ref: 3B-D1560

Chlorodimethyl-n-octadecylsilane, 95%

CAS: 18643-08-8

Preparation of hydrophobic surfaces, chain terminator

Formula: C₂₀H₄₃ClSi

Purity: 95%

Molecular weight: 347.1

Ref: 02-042414

Chlorodimethyloctadecylsilane

CAS: 18643-08-8

Formula: C₂₀H₄₃ClSi

Purity: 95%

Color and Shape: Liquid

Molecular weight: 347.0939

Ref: IN-DA0034LG

Chlorodimethyl(Octadecyl)Silane

CAS: 18643-08-8

Chlorodimethyl(Octadecyl)Silane

Purity: 98%

Molecular weight: 347.09g/mol

Ref: 54-OR1029958

n-OCTADECYLDIMETHYLCHLOROSILANE, 97%

CAS: 18643-08-8

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-Octadecyldimethylchlorosilane; Dimethyl-n-octadecylchlorosilane; Chlorodimethyloctadecylsilane; Chlorodimethylsilyl-n-octadecane
Contains <5% C18 isomersEmployed in bonded HPLC reverse phases

Formula: C₂₀H₄₃ClSi

Purity: 97% including isomers

Color and Shape: Off-White Solid

Molecular weight: 347.1

Ref: 3H-SIO6615.1

n-OCTADECYLDIMETHYLCHLOROSILANE

CAS: 18643-08-8

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-Octadecyldimethylchlorosilane; Dimethyl-n-octadecylchlorosilane; Chlorodimethyloctadecylsilane; Chlorodimethylsilyl-n-octadecane
Contains 5-10% C18 isomersEmployed in bonded HPLC reverse phases

Formula: C₂₀H₄₃ClSi

Purity: 97% including isomers

Color and Shape: Off-White Solid

Molecular weight: 347.1

Ref: 3H-SIO6615.0

n-Octadecyldimethylchlorosilane

CAS: 18643-08-8

Formula: C₂₀H₄₃ClSi

Purity: 95%

Color and Shape: Solid

Molecular weight: 347.1

Ref: 10-S12175

n-OCTADECYLDIMETHYLCHLOROSILANE, 70% in toluene

CAS: 18643-08-8

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-Octadecyldimethylchlorosilane; Dimethyl-n-octadecylchlorosilane; Chlorodimethyloctadecylsilane; Chlorodimethylsilyl-n-octadecane
Contains 5-10% C18 isomers70% in toluene

Formula: C₂₀H₄₃ClSi

Color and Shape: Straw Amber Liquid

Molecular weight: 347.1

Ref: 3H-SIO6615.2