AbstractThe mechanical lability of intermolecular hydrogen bonds in stoichiometric mixtures of acidic and basic butadiene copolymers has been studied by both infrared and mechanical methods. Comparison is made between the weight‐averagedE(t) andH(τ) spectra of the parent copolymers and those of the mixed copolymers. The results indicate that the maximum contributions of bond‐interchange relaxation migrate to shorter times as the concentration of bonding groups incre