Abstract
AbstractA Series of chains of different molecular weight of the fully aromatic polyamide poly(2,5‐pyrimidinediylterephthalamide)IUPAC name: poly(2,5‐pyrimidinediyliminoterephthaloylimino). (PPYMT) in the solvents 96 wt.‐% sulfuric acid and methanesulfonic acid have been characterized by means of static and dynamic light scattering, dilute solution viscosimetry and measurements of the critical polymer volume fraction for the onset of a nematic phase. The experimental results are in good agreement with a model of stiff worm‐like chains for the solution conformation of PPYMT, and the persistence length is estimated to be ca. 150 Å (lower limit: 50–100 Å).
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