Reversible CO₂fixation via self-assembled siloxanes

摘要

Methods are provided for synthesizing novel types of self-assembled siloxanes, such as polysiloxanes, with a sufficiently high density of amine functional groups to be useful for CO2 capture and release processes. Additionally, it has been unexpectedly found that some self-assembled polysiloxanes can be used for high temperature adsorption of CO2.

主权项

1. A polysiloxane composition comprising one or more crosslinking monomers and one or more non-crosslinking monomers, a molar ratio of crosslinking monomers to non-crosslinking monomers being about 5:1 or less, the crosslinking monomers having the structure
—(—O—Si(R3,R4)—)—,where R3 is an aminoalkyl moiety comprising one or more amine groups and 12 carbon atoms or less, and where R4 is an oxyalkyl moiety having 1 to 8 carbons or a silyl ether crosslink to another siloxane monomer, and the non-crosslinking monomers having the structure
—(—O—Si(R1,R2)—)—,where R1 is a C1-C4 alkyl moiety, and where R2 is independently a C1-C4 alkyl moiety or an aminoalkyl moiety comprising one or more amine groups and up to 12 carbon atoms,
wherein, in at least a portion of the non-crosslinking monomers, R2 is an aminoalkyl moiety comprising one or more amine groups and up to 12 carbon atoms.