Abstract: C-13 CP/MAS spectra of nylon 6 were obtained on MSL-400 spectrometer. It was found that the ω carbon
α β γ δ ω-[CO-CH₂-CH₂-CH₂-CH₂-CH₂-NH]-_n, nylon 6,shows two peaks in the solid state. They are designated as ω₁ and ω₂ which originate from different crystalline components. The two peaks coalesced in solution spectrum of the same sample. It gives the evidence of coexistence of different crystalline regions in solid nylon 6. In the solid state the ω₂ peak is 2.2 ppm upfield from the ω₁ peak.
A series of CP/MAS spectra of nylon 6 was measured by varying the contact time to investigate the dynamic behavior. A SIMPLEX nonlinear least square optimization algorithm was applied to calculate the cross-polarization rates T_IS and T_1P^H. The dynamic parameters of solid nylon 6 were calculated according to Ngai formalism.

Key words: Solid-State NMR, Dynamics, Nylon 6