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Abstract
The synthesis and the thermotropic behavior of polyesters based on a flexible spacer of eight methylene units and two aromatic ester triads built up with terephthalic acid and hydroquinone or 2-methyl-hydroquinone have been studied. Polymer synthesys took place through the preliminary preparation of the rigid monomers, which display liquid crystal properties inspite of their diphenolic character. A low molecular weight model of appropriate chemical structure was also prepared. The structural influence of the rigid segment on the thermotropic behavior of low and high molecular weight compounds is discussed in terms of onset, nature and thermal stability of the mesophases.