Abstract
The X-ray diffraction data for the copolyesters prepared from p-hydroxybenzoic acid (HBA) and 2-hydroxy-6-naphthoic acid (HNA) give nonperiodic layerlines that indicate a completely random monomer sequence distribution and also provide analytical information on the monomer proportions. Hence, these data provide a unique method to study transesterification between copolyesters with different monomer ratios. Immediately after melt blending, mixtures of the 30/10 and 15/25 copolymers exhibit a single solid-nematic transition at a temperature well below either the transitions of the starting copolymers or those of intermediate compositions. However, the meridional minima for both starting copolymers can be resolved in the fiber diffraction patterns, which indicates the formation of a compatible blend
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