silicones – diverse properties and applications silicones – diverse properties and applications...
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Silicones – Diverse properties and applications
Silicones – Diverse properties and applications
Other applications Fire protection Shock absorbers Restoration/dental prosthetics
Other applications Fire protection Shock absorbers Restoration/dental prosthetics
General properties Adjusted by viscosity Properties unaffected by changes in temperature Biological tolerance High stability to weathering
General properties Adjusted by viscosity Properties unaffected by changes in temperature Biological tolerance High stability to weathering
Contradictory properties Transparency/impermeability to light Electrically insulating/conducting Resistance to high/low temperatures Adhesive/nonstick properties Hydrophobic/hydrophilic Antifoams/foam stabilizers
Contradictory properties Transparency/impermeability to light Electrically insulating/conducting Resistance to high/low temperatures Adhesive/nonstick properties Hydrophobic/hydrophilic Antifoams/foam stabilizers
Silicones –Biological tolerance
Silicones –Biological tolerance
Si-O and Si-C bonds in silicone polymersPhysiologically inert
Medical...(Insulin pump, catheters...)
Medical...(Insulin pump, catheters...)
Pharmacological...(Tablets/capsule coating,
toothpastes)
Pharmacological...(Tablets/capsule coating,
toothpastes)
Cosmetics...(Creams, lipsticks...)
Cosmetics...(Creams, lipsticks...)
Silicones –Resistant to weathering
Silicones –Resistant to weathering
Silicone polymers: resistant to weathering, ozone and UV radiation; Stability of the SiC and SiO bonds and water repellency of silicones
Highly durable facade protectionHighly durable facade protection
Durable, scratch and UV resistant automotive finishes
Durable, scratch and UV resistant automotive finishes
Silicones –Colored or colorless
Silicones –Colored or colorless
SiO
SiO
R R
O
R R
Colorless• Refractive index determined by R (Me, Ph,....)
Colorless• Refractive index determined by R (Me, Ph,....)
Pigmented• Almost any color• Control over properties (Elastic, ceramifying, corrosion protection)
Pigmented• Almost any color• Control over properties (Elastic, ceramifying, corrosion protection)
Silicones – Adhesion promoters
Silicones – Adhesion promoters
Adhesion to inorganic surfaces (glass, metal)• Si-O-M bonds• SiOH HO-M bridges
Adhesion to inorganic surfaces (glass, metal)• Si-O-M bonds• SiOH HO-M bridges
Adhesion to organic surfaces (polymers) • Organic functionality (NH2, C(R)=CH2, )
Adhesion to organic surfaces (polymers) • Organic functionality (NH2, C(R)=CH2, )
O
MO
MO
MO
MO
M
OH O O OH O
Si SiHO
OSi
Me
O
MeO
MeOH
SiO
MeO Si
(CH2)3
HN
NH2
HO
Si
(CH2)3
O
O
NH
H2N
Synthetic resin
Silicone
Substrate
Silicones – Structural glazing
Silicones – Structural glazing
Extremely powerful, flexible combinations of metal and glass make innovative structures possible
Extremely powerful, flexible combinations of metal and glass make innovative structures possible
Silicone release agentsSilicone release agents
SiO Si
OSi O
SiO
SiO
SiO Si
O
Si
CH3CH3
CH3H3C CH3CH3
H3CCH3
H3CCH3
H3CCH3
H3CCH3
H3C CH3
Label paper
Adhesive
Silicone release agent
Substrate paper
Little interaction due to nonpolar “jacket”