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High resoluton NMR can be used for polymer characterization both in solution and in the solid state. The power of NMR as a method arises from the observation of individual carbon and proton atoms along the main chain and side chains of polymers. This makes it possible to charaterize in detail the microstructure, the conformation, and the molecular organization in the solid. NMR experiments with more than one frequency dimension (2D and 3D NMR) have revolutionized materials characterization, mainly owing to the increase in resolution and the ability to visualize interactions that were previously obscured by peak overlap. It is possible not only to assign many peaks in the spectra, but also to explore interactions between polymer chains to understand at a molecular level the formation of compatible blends. NMR experiments in two and three dimensions can be combined to determine polymer chain conformation and chain packing. The goal of these studies is to understand the relationship between the polymer properties on a molecular level and the behaviour of bulk materials.

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