The present invention relates to a composition comprising a plurality of molecules of a polymer A and a plurality of molecules of a polymer B, wherein polymer A carries two or more diene groups bound to the polymer structure as pendant reactive groups for a Diels-Alder reaction with polymer B polymer B carries two or more dienophile groups bound to the polymer structure as pendant reactive groups for a Diels-Alder reaction with polymer A and wherein at least one of polymer A and polymer B is a temperature-responsive polymer.
