High-Resolution Carbon-13 NMR of Polymers in the Solid State
by J. R. Lyerla, C. S. Yannoni
This paper reviews the salient features of the methods used for resolution and sensitivity enhancement in 13C NMR spectra of solids. Performance characteristics of the unique variable-temperature cross-polarization magic angle spinning (VT-CPMAS) apparatus developed in our laboratory are given. We present results of structural studies on fluoropolymers using this technique, and discuss the issue of intensities in cross-polarized spectra. In addition, results of an ongoing VT-CPMAS study of polypropylene dynamics are given.