Silicones

PDV-0346: Vinyl Terminated Diphenylsiloxane-Dimethylsiloxane Copolymer (Telechelic Functional Fluid) These fluids are most often employed in 2-part addition cure silicone elastomers where special thermal or optical properties are required. PDV-0346 Properties Viscosity: 60,000 cStMolecular Weight: 78,000 g/molVinyl (eq/kg): 0.017-0.021Refractive Index: 1.420

DMS-V25R: Vinyl Terminated PDMS, Reduced Volatility, 500 cSt (Telechelic Functional Fluid) Vinyl terminated polymers are most often employed in 2-part addition cure silicone elastomers. DMS-V25R Properties Viscosity: 500 cStMolecular Weight: 17,200 g/molWt.% Vinyl: 0.37-0.43Vinyl (eq/kg): 0.11-0.13Total Volatiles, 4 hrs@ 150°C: 0.2% maximum

Siloxane-Based Silane Reducing Agent Organosilanes are hydrocarbon-like and possess the ability to serve as both ionic and free-radical reducing agents. These reagents and their reaction by-products are safer and more easily handled and disposed than many other reducing agents. The metallic nature of silicon and its low electronegativity relative to hydrogen lead to polarization of the Si-H bond yielding a hydridic hydrogen and a milder reducing agent compared to aluminum-, boron-, and other metal-based hydrides. A summary of some key silane reductions are presented in Table 1 of the Silicon-Based Reducing Agents brochure. Pendant Functional Fluid; polyMethylHydrosiloxanes, TMS Terminated MethylHydrosiloxane homopolymers are used as water-proofing agents, reducing agents and as components in some foamed silicone systems. Poly(methylhydrosiloxane); Methyl hydrogen siloxane; Polysiloxanes, methyl hydrogen; Siloxanes and silicones, methyl hydrogen Viscosity: 30-45 cStMolecular Weight: 2,100-2,400 g/molMol% Hydride: 100Reduces lactones to lactolsReduces aldehydes, ketones, esters, lactones, triglycerides and epoxides to alcohols with zinc hydride catalysisWith titanium tetraisopropoxide catalysis carries out reductive amination of ketones and aldehydes and the reduction of acids or esters to 1° alcoholsWith TBAF catalysis selectively reduces aldehydes over ketonesUsed to generate tri-n-butyltin hydride ‘in-situ’ and in a one-pot hydrostannylation/Stille coupling sequenceReduces esters to alcoholsExtensive review of silicon based reducing agents: Larson, G.; Fry, J. L. "Ionic and Organometallic-Catalyzed Organosilane Reductions", Wipf, P., Ed.; Wiley, 2007

Siloxane-Based Silane Reducing Agent Organosilanes are hydrocarbon-like and possess the ability to serve as both ionic and free-radical reducing agents. These reagents and their reaction by-products are safer and more easily handled and disposed than many other reducing agents. The metallic nature of silicon and its low electronegativity relative to hydrogen lead to polarization of the Si-H bond yielding a hydridic hydrogen and a milder reducing agent compared to aluminum-, boron-, and other metal-based hydrides. A summary of some key silane reductions are presented in Table 1 of the Silicon-Based Reducing Agents brochure. Pendant Functional Fluid; MethylHydrosiloxane-Dimethylsiloxane Copolymer, TMS Terminated MethylHydrosiloxane copolymers are the primary cross linkers for 2-part vinyl-addition silicones and intermediates for functional copolymers. Hydrogen dimethicone; Dimethylhydropolysiloxane; Dimethicone/methicone copolymer; Polysiloxanes dimethyl methyl hydrogen, Hydride functional polydimethylsiloxane; Siloxanes and silicones, dimethyl, methyl hydrogen Viscosity: 750-1,000 cStMolecular Weight: 20,000-25,000 g/molMol% Hydride: 4-6Potential reducing agents in the mode of HMS-991 or HMS-994Extensive review of silicon based reducing agents: Larson, G.; Fry, J. L. "Ionic and Organometallic-Catalyzed Organosilane Reductions", Wipf, P., Ed.; Wiley, 2007

Siloxane-Based Silane Reducing Agent Organosilanes are hydrocarbon-like and possess the ability to serve as both ionic and free-radical reducing agents. These reagents and their reaction by-products are safer and more easily handled and disposed than many other reducing agents. The metallic nature of silicon and its low electronegativity relative to hydrogen lead to polarization of the Si-H bond yielding a hydridic hydrogen and a milder reducing agent compared to aluminum-, boron-, and other metal-based hydrides. A summary of some key silane reductions are presented in Table 1 of the Silicon-Based Reducing Agents brochure. Pendant Functional Fluid; MethylHydrosiloxane-Dimethylsiloxane Copolymer, TMS Terminated MethylHydrosiloxane copolymers are the primary cross linkers for 2-part vinyl-addition silicones and intermediates for functional copolymers. Hydrogen dimethicone; Dimethylhydropolysiloxane; Dimethicone/methicone copolymer; Polysiloxanes dimethyl methyl hydrogen, Hydride functional polydimethylsiloxane; Siloxanes and silicones, dimethyl, methyl hydrogen Viscosity: 25-35 cStMolecular Weight: 1,900-2,000 g/molMol% Hydride: 25-35Reduced volatility grade available, HMS-301Potential reducing agents in the mode of HMS-991 or HMS-999Extensive review of silicon based reducing agents: Larson, G.; Fry, J. L. "Ionic and Organometallic-Catalyzed Organosilane Reductions", Wipf, P., Ed.; Wiley, 2007

DMS-H11: Hydride Terminated PDMS, 7-10 cSt (Telechelic Functional Fluid) Hydride terminated silicones are chain extenders for vinyl-addition silicones, enabling low-viscosity, high elongation formulations. They are also intermediates for functionally terminated silicones. DMS-H11 Properties Viscosity: 7-10 cStMolecular Weight: 1,000-1,100 g/molWt.% Hydride: 0.2