Cross-polarization magic angle spinning amorphous solids

Another, perhaps clearer indication for isostructural character is given by solid-state,, 3C cross-polarization magic angle-spinning (CPMAS) NMR. A comparison of the high-field spectra revealed strong similarities for the decaphenylgermanium and tin compounds (the amorphous lead complex produced broader lines) (120). 

Chemical shifts in the C-NMR spectra can provide evidence of specific interaction between dissimilar components of the blend. A method termed cross-polarization, magic angle spinning (CPMAS- CNMR) has shown promise in identification of the environment of carbon nuclei in blends along with an assessment of the degree of homogeneity. Xe-NMR has been employed to determine structural order in amorphous blends. Xenon as a probe molecule will show separate resonances for a phase separated blend, but singular values for miscible blends. Examples where NMR techniques have been utilized for polymer blends will be briefly noted in this section. Reviews on the use of solid-state NMR to study the miscibility and characteristics of polymer blends include [223,224]. 

---