AbstractMost binary mixtures of polymers are not miscible on the molecular level in the absence of specific intermolecular interactions. Solid‐state13C and 2D13C,1H NMR has been used to study miscible polymer blends in an attempt to identify the interacting groups and gain a molecular level understanding of the forces that drive irascibility. Selective polarization transfer methods, either solid‐state nuclear Overhauser effects or windowless isotropic mixing, were used to study these interactions, and the interacting groups in several strongly and weakly interacting polymer blends were identif