Hydrolytically stable self-healing elastomer

A self-healing elastomer comprising polymeric chains comprising units of formula (A1)

• wherein
• R is a polybutadiene-containing aliphatic polyurethane;
• R1 and R1′ are independently selected from the group consisting of:
• —H, (C1-C2)alkyl, (C5-C14)aryl, —OR4, —(CO)R5, —O(CO)R6, —(SO)R7, CO—R8, —COOR9, —NO2, and halogen;
• R2, R2′, R3 and R3′ are independently selected from the group consisting of:
• —H, (C1- C20)alkyl and (C5-C14)aryl;
• R4 to R9 are the same or different, and are independently selected from the group consisting of:
• —H, (C1-C20)alkyl, and (C5-C14)aryl;
• m is 4;
• wherein the polymeric chains are linear, the linear polymeric chains comprising (a) from about 5 to about 100 units of formula (A1) per chain, and (b) a molar ratio of the polybutadiene-containing aliphatic polyurethane polymer to the aromatic disulfide of formula (A1) ranges from 0.7 to 1.3, wherein the elastomer is dynamically crosslinked by aromatic disulfide metathesis, and wherein the elastomer has a water contact angle of above 100°.