A novel sliding graft copolymer'' (SGC), in which many linear poly-epsilon-caprolactone (PCL) side chains are bound to cyclodextrin rings of a polyrotaxane, was prepared by ring-opening polymerization of epsilon-caprolactone initiated by hydroxyl groups of the polyrotaxane. An amorphous, flexible, and sufficiently tough elastomer film was prepared by crosslinking the obtained SGC-a supramolecule possessing a number of mobile side chains-with hexamethylene diisocyanate (HMDI).
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