Cyclosiloxanes, dimethyl, polymers with 1,3-divinyl-1,3-dimethyl-1,3-diphenyldisiloxane
CAS: 68037-52-5
Category: Organic Intermediates
| Purity | Industrial Grade (Vinyl content specified); High-Purity Silicone Grade; Electronic Grade (low volati |
| Molecular Formula | Polymer (variable composition) |
| Molecular Weight | Variable |
| Appearance | Colorless to pale yellow transparent viscous liquid |
| Packaging | 100 mL, 500 mL amber glass bottles; 5 kg, 20 kg polyethylene pails; 200 kg lined steel drums |
| Testing Indicators | Appearance — Visual inspection; Viscosity — Brookfield viscometer (ASTM D2196); Density — ASTM D4052; Refractive index — ASTM D1218; Vinyl content — 1H NMR or iodine titration; Molecular weight distribution — Gel Permeation Chromatography (GPC); Functional group identification — FTIR spectroscopy (vinyl and Si-O-Si absorption); Volatile content — ASTM D2369 or thermogravimetric analysis (TGA); Moisture — Karl Fischer titration; Thermal stability — TGA/DSC; Residual cyclic siloxanes (D3/D4/D5) — GC-FID or GC-MS. |
| Storage Notes | Store in tightly sealed original containers in a cool, dry, well-ventilated warehouse at 5–30°C. Protect from moisture, direct sunlight and excessive heat. Avoid contamination with platinum catalysts, peroxides, strong oxidizing agents and strong acids or bases. Prevent prolonged exposure to air to minimize viscosity changes. |
| Lead Time | 10 days |
A vinyl-functional silicone copolymer widely used as a reactive silicone intermediate for addition-cure (hydrosilylation) silicone elastomers, silicone release coatings, electronic encapsulants, thermal interface materials, optical-grade silicone formulations, pressure-sensitive adhesives, and specialty silicone resins. The incorporated diphenylsiloxane units improve low-temperature flexibility, thermal stability, UV resistance and optical transparency.