Use of carbon–carbon nuclear spin diffusion for the study of the miscibility of polymer blends

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Abstract
This high-resolution solid-state NMR work explores the usefulness of carbon–carbon nuclear spin diffusion to probe the miscibility of polymer blends. Experiments involving one- and two-dimensional NMR spectra, applied to blends of poly(ethylene terephthalate) (PET) and bisphenol-A polycarbonate (BPAPC), show that spin exchange occurs between carbon-13 nuclei located in monomer units that belong to the two different homopolymers. Carbon spin diffusion, which strongly depends on the internuclear distance, is explored as a possible probe for specific interactions between polar groups of the two polymers. Our results clearly show that the PET/BPAPC blends studied are homogeneously mixed at distances of 4.5 to 6 Å.