Natural abundance NMR methods were employed to analyze static and dynamic properties of poly(p-benzamide), the parent compound of the aramide family of polymers, dissolved in absolute sulfuric acid. Quantitative determinations of order in the liquid crystal phases arising in these systems were carried out with the aid of bidimensional C-13 NMR data collected in the solid phase and of total line shape simulations, and the parameters thus obtained were monitored as a function of temperature, concentration, and polymer molecular weight. These measurements revealed that by contrast to what had been inferred from previous macroscopic order determinations, the alignment of polymer molecules in their nematic domains is essentially independent of temperature. Existing measurements can still be explained in terms of a temperature-dependent isotropic reversible arrow nematic equilibrium, whose presence and thermodynamics were unambiguously characterized by NMR. Dynamic aspects of this interphase equilibrium as well as of the intraphase molecular diffusion in the nematic region were explored by bidimensional and pulsed-gradient NMR methods. Spectroscopic results were analyzed in terms of thermal and athermal theories predicting the appearance of nematic phases in rigid anisometric polymers and compared with recent NMR observation on other lyotropic aramide solutions.