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US 7,071,277 B2Granted
Poly(cyclosiloxane) composition and synthesis
AssigneeThe University of Akron
InventorsJoseph P. Kennedy, Pious Kurian
Life of this patent
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Abstract
A poly(cyclosiloxane) is synthesized by oxidation with water in the presence of a Pt catalyst, followed immediately by polycondensation of the Si—OH groups to form Si—O—Si linkages. Thus, pentamethylcyclopentasiloxane can be polymerized into poly(pentamethycyclopentasiloxane).
Claims13
A poly(cyclosiloxane) network composition comprising:
- repeating cyclosiloxane moieties having the formula
- wherein each R is the same or different for each cyclosiloxane moiety and is selected from the group consisting of a hydrogen, an alkyl group, an aryl group, and a cycloalkyl group, and wherein n is an integer from 3 to 8;
- wherein each R2 is either hydrogen or oxygen provided that when R2 is an oxygen it is bonded to another cyclosiloxane moiety;
- and wherein each cyclosiloxane moiety is bound to at least three other cyclosiloxane moieties via Si—O—Si functionalities.
1 more element
A poly(cyclosiloxane) network composition comprising:
- the polymerization reaction product of a plurality of cyclosiloxane moieties having the formula
- wherein each R is the same or different for each cyclosiloxane moiety and is selected from the group consisting of a hydrogen, an alkyl group, an aryl group, and a cycloalkyl group, wherein n is an integer from 3 to 8 and wherein each cyclosiloxane moiety is bound after polymerization to at least two other cyclosiloxane moieties via Si—O—Si functionalities.
A process for the preparation of a poly(cyclosiloxane) network composition comprising providing cyclosiloxane moieties having the formula
- wherein each R is the same or different for each cyclosiloxane moiety and is selected from the group consisting of a hydrogen, an alkyl group, an aryl group, and a cycloalkyl group, and wherein n is an integer from 3 to 8;
- oxidizing each cyclosiloxane moiety with water in the presence of a Pt catalyst to form at least two Si—OH groups from the Si—H groups present on each ring and immediately thereafter condensing the cyclic rings such that the SIOH groups on each ring react to provide Si—O—Si linkages between the cyclosiloxane moieties to farm a poly(cyclosiloxane) network composition.
Dependencies are inferred from the claim text.