Silicones

VDT-954: 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-954 Properties Viscosity: 300,000-500,000 cStMolecular Weight: 225,000 g/molVinyl (eq/kg): 1.1-1.4

DMS-V31: Vinyl Terminated PDMS, 1,000 cSt (Telechelic Functional Fluid) Vinyl terminated polymers are most often employed in 2-part addition cure silicone elastomers. DMS-V31 Properties Viscosity: 1,000 cStMolecular Weight: 28,000 g/molWt.% Vinyl: 0.18-0.26Vinyl (eq/kg): 0.07-0.10

DMS-S32: Silanol Terminated PDMS, 2,000 cSt (Telechelic Functional Fluid) Terminal silanol groups render polydimethylsiloxanes susceptible to condensation under both mild acid and base conditions. They are intermediates for most room temperature vulcanizeable (RTV) condensation cure silicones. The reactivity of silanol fluids is utilized in applications other than RTVs. Low viscosity silanol fluids are employed as filler treatments and structure control additives in silicone rubber compounding. Intermediate viscosity (1,000-10,000 cSt) fluids can be applied to textiles as durable fabric softeners. High viscosity silanol terminated fluids form the matrix component in tackifiers and pressure sensitive adhesives. DMS-S32 Properties Viscosity: 2,000 cStMolecular Weight: 36,000 g/molWt.% OH: 0.9OH (eq/kg): 0.050-0.055

PDV-0525: 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-0525 Properties Viscosity: 500 cStMolecular Weight: 14,000 g/molVinyl (eq/kg): 0.12-0.16Refractive Index: 1.430

DMS-S27: Silanol Terminated PDMS, 700-800 cSt (Telechelic Functional Fluid) Terminal silanol groups render polydimethylsiloxanes susceptible to condensation under both mild acid and base conditions. They are intermediates for most room temperature vulcanizeable (RTV) condensation cure silicones. The reactivity of silanol fluids is utilized in applications other than RTVs. Low viscosity silanol fluids are employed as filler treatments and structure control additives in silicone rubber compounding. Intermediate viscosity (1,000-10,000 cSt) fluids can be applied to textiles as durable fabric softeners. High viscosity silanol terminated fluids form the matrix component in tackifiers and pressure sensitive adhesives. DMS-S27 Properties Viscosity: 700-800 StMolecular Weight: 18,000 g/molWt.% OH: 0.2OH (eq/kg): 0.11-0.13

MCR-V41: monoVinyl Terminated Polydimethylsiloxane (Monofunctional Fluid) Mono-vinyl functional PDMS macromers are monodisperse (low PDI) fluids that can be used as components in silicone gels and modifiers in release coatings. MCR-V41 Properties Viscosity: 8,000-12,000 cStMolecular Weight: 55,000-65,000 g/molRefractive Index: 1.404

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: 6-7Potential reducing agents in the mode of HMS-991 or HMS-996Extensive review of silicon based reducing agents: Larson, G.; Fry, J. L. "Ionic and Organometallic-Catalyzed Organosilane Reductions", Wipf, P., Ed.; Wiley, 2007

DMS-S21: Silanol Terminated PDMS, 90-120 cSt (Telechelic Functional Fluid) Terminal silanol groups render polydimethylsiloxanes susceptible to condensation under both mild acid and base conditions. They are intermediates for most room temperature vulcanizeable (RTV) condensation cure silicones. The reactivity of silanol fluids is utilized in applications other than RTVs. Low viscosity silanol fluids are employed as filler treatments and structure control additives in silicone rubber compounding. Intermediate viscosity (1,000-10,000 cSt) fluids can be applied to textiles as durable fabric softeners. High viscosity silanol terminated fluids form the matrix component in tackifiers and pressure sensitive adhesives. DMS-S21 Properties Viscosity: 90-120 cStMolecular Weight: 4,200 g/molWt.% OH: 0.8-0.9OH (eq/kg): 0.47-0.53

DMS-V25: Vinyl Terminated PDMS, 500 cSt (Telechelic Functional Fluid) Vinyl terminated polymers are most often employed in 2-part addition cure silicone elastomers. DMS-V25 Properties Viscosity: 500 cStMolecular Weight: 17,200 g/molWt.% Vinyl: 0.37-0.43Vinyl (eq/kg): 0.11-0.13

PDV-1625: 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-1625 Properties Viscosity: 500 cStMolecular Weight: 9,500 g/molVinyl (eq/kg): 0.19-0.23Refractive Index: 1.465

FMV-4035: Vinyl Terminated TrifluoropropylMethylsiloxane-Dimethylsiloxane Copolymer (Telechelic Functional Fluid) Vinyl functional fluorosilicones offer greater solvent resistance (lower hydrocarbon solubility) and lower refractive index than analogous dimethylsiloxane homopolymers. FMV-4035 Properties Viscosity: 4,000-6,000 cStMolecular Weight: 6,000-9,000 g/molRefractive Index: 1.388

PDV-1631: 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-1631 Properties Viscosity: 1,000 cStMolecular Weight: 19,000 g/molVinyl (eq/kg): 0.09-0.12Refractive Index: 1.465

DMS-S14: Silanol Terminated PDMS, 35-45 cSt (Telechelic Functional Fluid) Terminal silanol groups render polydimethylsiloxanes susceptible to condensation under both mild acid and base conditions. They are intermediates for most room temperature vulcanizeable (RTV) condensation cure silicones. The reactivity of silanol fluids is utilized in applications other than RTVs. Low viscosity silanol fluids are employed as filler treatments and structure control additives in silicone rubber compounding. Intermediate viscosity (1,000-10,000 cSt) fluids can be applied to textiles as durable fabric softeners. High viscosity silanol terminated fluids form the matrix component in tackifiers and pressure sensitive adhesives. DMS-S14 Properties Viscosity: 35-45 cStMolecular Weight: 700-1,500 g/molWt.% OH: 30.-4.0OH (eq/kg): 1.7-2.3

DMS-V51: Vinyl Terminated PDMS, 100,000 cSt (Telechelic Functional Fluid) Vinyl terminated polymers are most often employed in 2-part addition cure silicone elastomers. DMS-V51 Properties Viscosity: 100,000 cStMolecular Weight: 140,000 g/molWt.% Vinyl: 0.03-0.05Vinyl (eq/kg): 0.016-0.018

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: 20-35 cStMolecular Weight: 1,800-2,100 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

FMV-4042: Vinyl Terminated TrifluoropropylMethylsiloxane-Dimethylsiloxane Copolymer (Telechelic Functional Fluid) Vinyl functional fluorosilicones offer greater solvent resistance (lower hydrocarbon solubility) and lower refractive index than analogous dimethylsiloxane homopolymers. FMV-4042 Properties Viscosity: 14,000-18,000 cStMolecular Weight: 25,000-25,000 g/molRefractive Index: 1.388

VDT-163: 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-163 Properties Viscosity: 2,000,000-4,000,000 cStMolecular Weight: 425,000 g/molVinyl (eq/kg): 0.04-0.08

DMS-R22: Methacryloxypropyl Terminated PDMS, 125-250 cSt (Telechelic Functional Fluid) Methacrylate and Acrylate functional siloxanes undergo the same reactions generally associated with methacrylates and acrylates, the most conspicuous being radical induced polymerization. Unlike vinylsiloxanes which are sluggish compared to their organic counterparts, methacrylate and acrylate siloxanes have similar reactivity to their organic counterparts. The principal applications of methacrylate functional siloxanes are as modifiers to organic systems. Upon radical induced polymerization, methacryloxypropyl terminated siloxanes by themselves only increase in viscosity. Copolymers with greater than 5 mole % methacrylate substitution crosslink to give non-flowable resins. Acrylate functional siloxanes cure greater than ten times as fast methacrylate functional siloxanes on exposure to UV in the presence of a photoinitiator such as ethylbenzoin. Oxygen is an inhibitor for methacrylate polymerization in general. The high oxygen permeability of siloxanes usually makes it necessary to blanket these materials with nitrogen or argon in order to obtain reasonable cures. DMS-R22 Properties Viscosity: 125-250 cStMolecular Weight: 10,000 g/molRefractive Index: 1.405