Abstract: The present invention refers to a polymer blend comprising (i) between 10 wt % and 99.9 wt %, with respect to the total weight of the blend, of a thermoplastic host polymer, provided it is not a polyborosiloxane; and (ii) between 0.1 wt % and 90 wt %, with respect to the total weight of the blend, of a disulfide-containing self-healing polymer comprising a first polymeric chain fragment comprising one or more disulfide moieties and at least one moiety selected from the group consisting of —N(R1)—C(?O)—N(R2)—, —N(R1)—C(?O)—O— and —N(R1)—C(?O)—S—, wherein each R1 and R2 is independently selected from the group consisting of hydrogen, C1-C24-alkyl and C6-C15-aryl. The invention also refers to use of said blends, for example as cable sheaths.