Abstract
Reported here are some results of rapid Ring Opening Metathesis Polymerization (ROMP) of norbornene-functional oligomeric siloxanes using a Ru-based catalytic system. The in situ formation of the active metal carbene catalyst by addition of a diazo compound to norbornene-functional siloxane containing the catalytic system, [(p-cymene)RuCl2]2/PCy3 allowed fast but controlled polymerization of the norbornene functionalities. Thus, in a solventless system, polymerization of a norbornene-functional siloxane, e.g., 1,1,1,2,3,3,3-heptamethyl-2-norbornen-5-yltrisiloxane, at 60°C with low catalyst levels (2 to 200 ppm) led to a colourless monolithic gel in less than 30 seconds. Besides being an efficient cross-linking technology, ROMP of suitable precursors may also be a source of novel silicone-organic materials.
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Chevalier, P.M., MacKinnon, I.A. Ring-Opening Olefin Metathesis Polymerisation (ROMP) as a Potential Cross-Linking Mechanism for Siloxane Polymers. Journal of Inorganic and Organometallic Polymers 9, 151–164 (1999). https://doi.org/10.1023/A:1021607027178
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DOI: https://doi.org/10.1023/A:1021607027178