COMPATIBILITY OF TPD POLYCARBONATE BLENDS BY C-13-H-1 HETCOR IN THE SOLID-STATE

Two-dimensional heteronuclear C-13-H-1 NMR measurements in the solid state have been used to investigate the compatibility of a solvent cast blend of an aromatic diamine, N,N'-diphenyl-N,N'-bis(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine (TPD) in Bisphenol A polycarbonate. Measurements of carbon-proton correlations as a function of proton spin diffusion time, inserted between the proton evolution and cross-polarization periods, are interpreted in terms of an initial fast response from both inter- and intramolecular dipolar couplings and a slower response only from intermolecular couplings. The 2-D technique is capable of observing spin diffusion between domains even though there are no resolved peaks from the individual components in the H-1 dimension. Distinction between domains is based upon the differences in aliphatic and aromatic proton populations of the individual components or on differences in proton projection line shapes for unique carbon resonances from each component. From these results it is shown that, although there is a distribution of separations of the small molecule amine from the polymer binder, inter- and intramolecular spin diffusion occur at similar rates, indicative of intimate mixing at the molecular level.