Cure-on-demand moisture-curable urethane-containing fuel resistant prepolymers and compositions thereof

A composition comprising:

• (a) a moisture-curable urethane-containing prepolymer comprising a moisture-curable urethane-containing prepolymer of Formula (2a), a moisture-curable urethane-containing prepolymer of Formula (2b), or a combination thereof:
• R30—C(═O)—NH—R20—NH—C(═O)—[—R60—C(═O)—NH—R20—NH—C(═O)—]w—R60—C(═O)—NH—R20—NH—C(═O)—R30 (2a)
• B{—V′—S—R50—S—(CH2)2—O—R13—O—[—C(═O)—NH—R20—NH—C(═O)—R60—]w—C(═O)—NH—R20—NH—C(═O)—R30}z (2b)
• wherein,
• w is an integer from 1 to 100;
• each R13 independently comprises C2-10 alkanediyl;
• each R20 independently comprises a core of a diisocyanate;
• each R30 independently is a moiety comprising a terminal polyalkoxysilyl group;
• each R50 independently comprises a core of a sulfur-containing prepolymer, wherein the sulfur-containing prepolymer comprises a polythioether, a polysulfide, a sulfur-containing polyformal, or a combination of any of the foregoing;
• each R60 independently comprises a moiety having the structure of Formula (3):
• —O—R13—O—(CH2)2—S—R50—S—(CH2)2—O—R13—O— (3)
• B represents a core of a z-valent, polyfunctionalizing agent B(—V)z wherein,
• z is an integer from 3 to 6;
• and
• each V is a moiety comprising a terminal group reactive with a thiol group;
• and
• each —V′— is derived from the reaction of —V with a thiol;
• and
• (b) a controlled release moisture cure catalyst.