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Fascinating Silicone™ The Versatile Silicone Toolbox – Silicone Resins: Structure and Properties

Silicone resins – structure and properties

Structure

Silicone resins are heavily crosslinked, three-dimensional networks of highly branched siloxane polymers that generally require curing at elevated temperatures. Unlike elastomers, silicone resins do not usually contain silica fillers.

Silicone resins are very complex three-dimensional structures with complex properties.

Silicone resins are very complex structures with complex properties.

They almost always possess silicone reactivity in the form of silanol (≡SiOH) and may be designed to possess organic reactivity as well.

Properties

In high-performance coatings, silicone resins enhance gloss and color retention, and resistance to corrosion, moisture, weather, and heat. In specialty chemical formulations, silicone resins enhance weatherability, water repellency, physical strength, and release properties.

Silicone resins with high methyl content offer:

  • Flexibility
  • Water repellency
  • Low-temperature flexibility
  • Fast cure
  • Arc resistance
  • Gloss retention
  • Heat/shock resistance
  • UV stability

Silicone resins with high phenyl content offer:

  • Superior thermal stability
  • Oxidation resistance
  • Greater thermoplasticity
  • Toughness
  • Compatibility with organic polymers and pigments

A wide range of performance options

Silicone resins can be tailored to suit many applications by varying the ratio of branched and linear siloxanes in their composition and by attaching different functional groups to the silicon.

Because silicone resins can combine with many different organic polymers, it is very easy to optimize cure characteristics, flexibility, adhesion, weather resistance, and other properties.

 Did you know ... silicone resins resist heat and weather better than carbon-based resins because a Si-O-Si bond is much stronger and harder to break than a C-C bond! 
 

Did you know ... one of the first commercially useful silicone products was a silicone resin developed in the 1930s by
Dr. J. Franklin Hyde for
impregnating and coating
glass cloth!

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