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”