Silicone resin
Silicone resins are a type of
When R is methyl, the four possible functional siloxane monomeric units are described as follows:[2]
- "M" stands for trimethylsilanol, Me3SiO;
- "D" for Me2SiO2;
- "T" for MeSiO3;
- "Q" for SiO4.
Note that a network of only Q groups becomes fused quartz.
The most abundant silicone resins are built of D and T units (DT resins) or from M and Q units (MQ resins), however many other combinations (MDT, MTQ, QDT) are also used in industry.
Silicone resins represent a broad range of products. Materials of molecular weight in the range of 1000–10,000 are very useful in pressure-sensitive adhesives, silicone rubbers, coatings and additives.[3][4] Polysiloxane polymers with reactive side group functionality such as vinyl, acrylate, epoxy, mercaptan or amine, are used to create thermoset polymer matrix composites, coatings and adhesives.[5]
Silicone resins are prepared by
Microbial deterioration
The algae Stichococcus bacillaris, and certain fungal species have been seen to colonize silicone resins used at archaeological sites.[6]
See also
- Water glass (Sodium silicate, .e.g Na2SiO3 etc.)
- Silicon rubber
References
- ^ a b S.J. Clarson, J.A. Semlyen, Siloxane Polymers, Prentice Hall, New Jersey (1993).
- ^ Dow Corning nomenclature of silicon resins
- ^ List of silicone resins produced by Dow Corning
- ^ Database of silicon resins produced by Momentive Performance Materials (formerly GE Silicones)
- ISBN 978-1-4020-0348-6
- PMID 18065627.
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