-Polarized and depolarized absolute intensity light scattering, photon correlation light scattering and viscometry studies are reported on solutions in methane sulfonic acid, MSA, poly(1,4-phenylene-2,6-benzobisthiazole), PBT, and copolymers of PBT containing a bipyridyl moiety in place of some of the phenylene residues. It is found that addition of the potassium salt of MSA to the solutions reduces the second virial coefficient and causes pronounced increase in the depolarized scattering, with accompanying changes in other properties studied. The photon correlation light scattering is analyzed in terms of pseudo-components comprising aggregates with substantial orientational correlation among the rodlike chain elements. This behavior may be in accord with predicted behavior for the phase equilibria for rodlike chains.
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