NMR Analysis of Polyimides
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Nuclear magnetic resonance (NMR) spectroscopy is an established technique used by chemists for structure determinations. It can be used to obtain formation of the bulk chemical structure and chain dynamics of polyimides and other nitrogen-containing polymers. One of the primary nuclei of interest has been carbon-13 (13C). Unfortunately 13C spectra of polyimides or, in fact, any nitrogen-containing polymer are not well resolved, especially peaks for carbons attached to nitrogen, due to the quadrupole moment of nitrogen-14 (14N). With poor resolution, it becomes very difficult to obtain detailed information on the chemical structure and chain dynamics of a polymer. This problem might be overcome by using a nitrogen-15 (15N)-enriched (99% atom enrichment) polyimide or other polymer for the solid-state NMR studies.