ETHYLTRICHLOROSILANE

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.

Viscosity: 0.48 cSt

ΔH_comb: -2,696 kJ/mol

ΔH_form: -84 kJ/mol

ΔH_vap: 37.7 kJ/mol

ΔH_fus: 7.0 kJ/mol

Dipole moment: 2.1

Vapor pressure, 20 °C: 26 mm

Vapor pressure, 30.4 °C: 66 mm

Critical temperature: 287 °C

Coefficient of thermal expansion: 1.5 x 10^-3

Employed in the cobalt-catalyzed Diels-Alder approach to 1,3-disubstituted and 1,2,3-trisubstituted benzenes