The molecular level characterization of polymer blends remains
one of the important goals in polymer science, and we present
a new method involving the DUMBO-1 multiple-pulse selection
and 2D 1He13C HETCOR techniques to identify the specific intermolecular
interactions in glassy polymer blends. These advanced
NMR techniques are simple to perform and useful for the characterization
of a wide variety of rigid polymer materials. The observation
of the HETCOR cross peaks between the OCH3 protons of
PMMA and the phenolic OH protons as well as the aromatic ring
protons of PVPh is strong evidence of miscibility in the solid state.
The results indicate that an intermolecular hydrogen-bonding
interaction causes the blends to be miscible.