Silicones

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: 10-15 cStMolecular Weight: 900-1,200 g/molMol% Hydride: 45-55Potential reducing agents in the mode of HMS-991 or HMS-992Extensive review of silicon based reducing agents: Larson, G.; Fry, J. L. "Ionic and Organometallic-Catalyzed Organosilane Reductions", Wipf, P., Ed.; Wiley, 2007

DMS-S51: Silanol Terminated PDMS, 90,000-150,000 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-S51 Properties Viscosity: 90,000-150,000 cStMolecular Weight: 139,000 g/molWt.% OH: 0.02OH (eq/kg): 0.010-0.015

DMS-H25: Hydride Terminated PDMS, 500 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-H25 Properties Viscosity: 500 cStMolecular Weight: 17,200 g/molWt.% Hydride: 0.01

DMS-V00: Vinyl Terminated PDMS, 0.7 cSt (Telechelic Functional Fluid) Vinyl terminated polymers are most often employed in 2-part addition cure silicone elastomers. DMS-V00 Properties Viscosity: 0.7 cStMolecular Weight: 186 g/molWt.% Vinyl: 29Vinyl (eq/kg): 10.9

DMS-H03: Hydride Terminated PDMS, 2-3 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-H03 Properties Viscosity: 2-3 cStMolecular Weight: 400-500 g/molWt.% Hydride: 0.5

PDV-1641: 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-1641 Properties Viscosity: 10,000 cStMolecular Weight: 55,000 g/molVinyl (eq/kg): 0.033-0.040Refractive Index: 1.465

DMS-S15: Silanol Terminated PDMS, 45-85 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-S15 Properties Viscosity: 45-85 cStMolecular Weight: 2,000-3,500 g/molWt.% OH: 0.9-1.2OH (eq/kg): 0.53-0.70

DMS-V46: Vinyl Terminated PDMS, 60,000 cSt (Telechelic Functional Fluid) Vinyl terminated polymers are most often employed in 2-part addition cure silicone elastomers. DMS-V46 Properties Viscosity: 60,000 cStMolecular Weight: 117,000 g/molWt.% Vinyl: 0.04-0.06Vinyl (eq/kg): 0.018-0.020

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: 6,000-9,000 cStMolecular Weight: 50,000-60,000 g/molMol% Hydride: 4-8Potential reducing agents in the mode of HMS-991 or HMS-995Extensive review of silicon based reducing agents: Larson, G.; Fry, J. L. "Ionic and Organometallic-Catalyzed Organosilane Reductions", Wipf, P., Ed.; Wiley, 2007

Pendant Functional Fluid; Methyl Hydrosiloxane-Dimethylsiloxane Copolymer MethylHydrosiloxane copolymers are the primary cross linkers for 2-part vinyl-addition silicones and intermediates for functional copolymers. 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. Hydrogen dimethicone; Dimethylhydropolysiloxane; Dimethicone/methicone copolymer; Polysiloxanes dimethyl methyl hydrogen; Hydride functional polydimethylsiloxane; Siloxanes and silicones, dimethyl, methyl hydrogen Viscosity: 5,000-8,000 cStMolecular Weight: 45,000-60,000 g/molMol% Hydride: 0.5-1.5High molecular weight silane reducing agentReduced volatility grade available, HMS-013RExtensive review of silicon based reducing agents: Larson, G.; Fry, J. L. "Ionic and Organometallic-Catalyzed Organosilane Reductions", Wipf, P., Ed.; Wiley, 2007

DMS-S35: Silanol Terminated PDMS, 5,000 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-S35 Properties Viscosity: 5,000 cStMolecular Weight: 49,000 g/molWt.% OH: 0.07OH (eq/kg): 0.039-0.043

PDV-0325: 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-0325 Properties Viscosity: 500cStMolecular Weight: 15,500 g/molVinyl (eq/kg): 0.10-0.16Refractive Index: 1.420

DMS-V22: Vinyl Terminated PDMS, 200 cSt (Telechelic Functional Fluid) Vinyl terminated polymers are most often employed in 2-part addition cure silicone elastomers. DMS-V22 Properties Viscosity: 200 cStMolecular Weight: 9,400 g/molWt.% Vinyl: 0.4-0.6Vinyl (eq/kg): 0.21-0.24

DMS-R11: Methacryloxypropyl Terminated PDMS, 8-14 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-R11 Properties Viscosity: 8-14 cStMolecular Weight: 900-1,200 g/molRefractive Index: 1.422

DMS-V03: Vinyl Terminated PDMS, 2-3 cSt (Telechelic Functional Fluid) Vinyl terminated polymers are most often employed in 2-part addition cure silicone elastomers. DMS-V03 Properties Viscosity: 2-3 cStMolecular Weight: 500 g/molWt.% Vinyl: 10-12Vinyl (eq/kg): 3.6-4.3

DMS-R18: Methacryloxypropyl Terminated PDMS, 50-90 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-R18 Properties Viscosity: 50-90 cStMolecular Weight: 4,500-5,500 g/molRefractive Index: 1.409

DMS-S12: Silanol Terminated PDMS, 16-32 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-S12 Porperties Viscosity: 16-32 cStMolecular Weight: 400-700 g/molWt.% OH: 4.5-7.5OH (eq/kg): 2.3-3.5

VDT-123: 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-123 Properties Viscosity: 250-350 cStMolecular Weight: 12,000 g/molVinyl (eq/kg): 0.11-0.15

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

Applications A silicon based compound that can be used to create potentially biocompatible materials. Used as a monomer in the synthesis of long chain polysiloxane structures. Used in the methylation of mercury(II) salts. 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 Radeva, E. et al.: J. Optoelec. Adv. Mat., 11, 1432 (2009); Gandhiraman, R.P. et al.: Plama Proc. Polym., 11, 1432 (2009); Watanabe, N. et al.: Ecotoxic. Env. Safety, 11, 174 (1986);

PDV-0331: 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-0331 Properties Viscosity: 1,000 cStMolecular Weight: 27,000 g/molVinyl (eq/kg): 0.065-0.011Refractive Index: 1.420

DMS-V35R: Vinyl Terminated PDMS, Reduced Volatility, 5,000 cSt (Telechelic Functional Fluid) Vinyl terminated polymers are most often employed in 2-part addition cure silicone elastomers. DMS-V35R Properties Viscosity: 5,000 cStMolecular Weight: 49,500 g/molWt.% Vinyl: 0.10-0.13Vinyl (eq/kg): 0.04-0.05Total Volatiles, 4 hrs@ 150°C: 0.2% maximum

VDT-131: 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-131 Properties Viscosity: 800-1,200 cStMolecular Weight: 28,000 g/molVinyl (eq/kg): 0.11-0.15

DMS-V21: Vinyl Terminated PDMS, 100 cSt (Telechelic Functional Fluid) Vinyl terminated polymers are most often employed in 2-part addition cure silicone elastomers. DMS-V21 Properties Viscosity: 100 cStMolecular Weight: 6,000 g/molWt.% Vinyl: 0.8-1.2 Vinyl (eq/kg): 0.33-0.37

DMS-V05: Vinyl Terminated PDMS, 4-8 cSt (Telechelic Functional Fluid) Vinyl terminated polymers are most often employed in 2-part addition cure silicone elastomers. DMS-V05 Properties Viscosity: 4-8 cStMolecular Weight: 800 g/molWt.% Vinyl: 7-9Vinyl (eq/kg): 2.4-2.9

DMS-V42: Vinyl Terminated PDMS, 20,000 cSt (Telechelic Functional Fluid) Vinyl terminated polymers are most often employed in 2-part addition cure silicone elastomers. DMS-V42 Properties Viscosity: 20,000 cStMolecular Weight: 72,000 g/molWt.% Vinyl:0.07-0.09Vinyl (eq/kg): 0.025-0.030

MCR-V21: 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-V21 Properties Viscosity: 80-120 cStMolecular Weight: 5,500-6,500 g/molRefractive Index: 1.403