3D-FO45367 - octamethylcyclotetrasiloxane | 556-67-2

S12400 - Octamethylcyclotetrasiloxane

Applications Octamethylcyclotetrasiloxane, is an organometallic reagent , that can be used for the preparation of siloxane polymers, with high surface-hydrophobicity restoration.
Not a dangerous good if item is equal to or less than 1g/ml and there is less than 100g/ml in the package
References Fritz, O., et al.: MRS Online Proceedings Library, 1535 (2012); Vanossi, A., et al.: Condensed Matter (2013);

Octamethylcyclotetrasiloxane, 98%

ALD Material
Atomic layer deposition (ALD) is a chemically self-limiting deposition technique that is based on the sequential use of a gaseous chemical process. A thin film (as fine as -0.1 Å per cycle) results from repeating the deposition sequence as many times as needed to reach a certain thickness. The major characteristic of the films is the resulting conformality and the controlled deposition manner. Precursor selection is key in ALD processes, namely finding molecules which will have enough reactivity to produce the desired films yet are stable enough to be handled and safely delivered to the reaction chamber.
Octamethylcyclotetrasiloxane; D4; Cyclic tetramer; Cyclomethicone; Cyclohexasiloxane; Cyclotetrasiloxane; OMCTS
Viscosity: 2.3 cStΔHfus: 18.4 kJ/molΔHvap: 45.6 kJ/molDipole moment: 1.09 debyeVapor pressure, 23 °C: 1 mmDielectric constant: 2.39Ring strain: 1.00 kJ/molSurface tension, 20 °C: 17.9 mN/mCritical temperature: 314 °CCritical pressure: 1.03 mPaSpecific heat: 502 J/g/°Coefficient of thermal expansion: 0.8 x 10-3Cryoscopic constant: 11.2Henry’s law constant, Hc: 3.4 ± 1.7Ea, polym: 79 kJ/molOctanol/water partition coefficient, log Kow: 5.1Basic building block for silicones by ring-opening polymerizationSolubility, water: 50 ?g/l

VDT-731: Vinylmethylsiloxane-Dimethylsiloxane Copolymer, TMS Terminated (Pendant Functional Fluid)
Vinyl containing copolymers are used as crosslinkers in Pt and peroxide 2-part addition cure elastomers.
VDT-731 Properties
Viscosity: 800-1,200 cStMolecular Weight: 28,000 g/molVinyl (eq/kg): 0.9-1.1