This research investigates the influence of monomer composition on the thermal transitions, microstructure, and viscoelastic properties of thermotropic liquid crystalline polymers LCPs) based on 1, 4-hydroxy-benzoic acid B) and 2,6-hydroxy-naphthoic acid N). Compositions B-N of 1:1, 1:3, 3:1, and 2:1 mol% were studied. The solid-to-nematic transition T-s -> n was greatly influenced by the monomer composition, ranging from 230 to 280 degrees C. However, the decomposition temperature T-dec was independent of composition, all the materials degrading at T-dec = 509 degrees C. Polarized optical microscopy showed a threaded texture in the nematic phase. Fiber X-ray diffraction showed aperiodic meridional maxima for all LCPs, the number of maxima depended on composition. B-N 3:1 and 1:3 mol% favor the orthorhombic crystallographic phase whereas the 1:1 and 2:1 mol% crystallized in a pseudohexagonal phase. Dynamic time sweeps showed that the nematic phases are stable at the temperatures studied. Strain sweeps showed the existence of a linear viscoelastic LVE) regime. The LVE properties ranged from predominantly viscous (G' < G '') for the 1:1 mol% composition to predominantly elastic (G' > G '') and with a well-defined rubber-like regime for the 1:3 mol% composition, resembling the rheology of flexible polymer melts. The persistence length q appears to be the parameter driving the rheological behavior.