Michael addition curing chemistries for sulfur-containing polymer compositions employing bis(sulfonyl)alkanols

摘要

Compositions useful in aerospace sealant applications comprise sulfur-containing polymers such as polythioethers and polysulfides and are cured using Michael addition reactions. Compositions employing Michael addition curing chemistries include sulfur-containing adducts comprising terminal Michael acceptor groups. In particular, the sulfur-containing adducts include terminal 1-(ethylenesulfonyl)-n-(vinylsulfonyl)alkanol groups.

主权项

1. A polythioether Michael acceptor adduct comprising a polythioether Michael acceptor adduct of Formula (3), a polythioether Michael acceptor adduct of Formula (3a), or a combination thereof:
R6—S—R1—[—S—(CH2)p—O—(R2—O)m—(CH2)2—S—R1—]n—S—R6   (3) {R6—S—R1—[—S—(CH2)p—O—(R2—O)m—(CH2)2—S—R1—]n—S—V′—}zB   (3a) wherein:
Rl is —(CH2)2—O—(CH2)2—O—(CH2)2—;p is 2;R2 is —(CH2)2—;m is 2;n is an integer from 1 to 60;B represents a core of a z-valent, vinyl-terminated polyfunctionalizing agent B(—V)z wherein:
z is an integer from 3 to 6; andeach V is a group comprising a group reactive with thiol groups; andeach —V′— is derived from the reaction of —V with a thiol; andeach R6 is independently a moiety comprising a terminal 1-(ethylenesulfonyl)-n-(vinylsulfonyl)alkanol group.