1020-84-4

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1,1,3,3,5,5,7,7-OCTAMETHYLCYCLOTETRASILAZANE

Product Code: SIO6698.0

Cas No: 1020-84-4

R&D quantities:

100 g
$162.00
25 g
$50.00
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.

1,1,3,3,5,5,7,7-Octamethylcyclotetrasilazane; OMCTS; 2,2,4,4,6,6,8,8-Octamethylcyclotetrasilazane
  • ΔHform: 787 kJ/mol
  • Forms α-Si3N4 by ammonia thermal synthesis
  • Boiling Point: 225°

    EINECS Number: 213-817-4

    Melting Point: 97°

    Molecular Weight: 292.68

    Alternative Name: OCTAMETHYLSILANETETRAMINE

    Specific Gravity: 0.950

    Flashpoint: 66°C (151°F)

    HMIS Key: 3-2-1-X

    Hydrolytic Sensitivity: 7: reacts slowly with moisture/water

    Formula: C8H28N4Si4

    Refractive Index: 1.458

    TSCA: TSCA

    Application: Forms ?-Si3N4 by ammonia thermal synthesis.1

    Reference: 1. Schaible, S. et al. Applied Organomet. Chem. 1993, 7, 53.

    Additional Properties: ?Hform: 188 kcal/mole