Silicone resins

Outstanding properties such as thermal stability, weathering resi­stance, low temperature flexibility, low surface tension, hydropho — bicity and surface activity of silicone resins and their combinations with other resins made them a commercially important category of binders for high performance coatings.

Table 2.9: Typical monomers for silicones

Monomer

Functionality*

Effect in final structure of silicone

Symbol

SiX4**

4

Forms special structure (branching)

Q (quad)

RSIX3

3

Forms special structure (branching)

T (tri)

R2SiX2

2

Forms linear structure (chains)

D (di)

R.,six

1

Chain termination

M (mono)

R = methyl or phenyl, X = halogen (most commonly Cl)

* With respect to hydrolyzable groups

** Though used in silicones, it is not an organosiloxane

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