group showed that the reverse reaction at elevated temperatures
results in the depolymerization of linear polyurethanes and in
easy processability, provided that the molecular weights are
not too high [12e14]. Nitroso dimerization [15], the reaction
of azlactones with phenols [16] and the reaction of carboxylic
acids with vinyl ethers [17] have also been applied to obtain
thermoreversible polymer networks. Finally, the reactions of