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The concentration dependence of the sedimentation coefficient of poly(amidobenzimidazole) solutions in the neutralized form in DMAA and in the hydrochloride form in DMAA +0.3% LiCl has been investigated. With the aid of this dependence, the molecular weights Mks and the coefficients (1‐b) in the equation S0 = K = M1–b for these two systems were determined. The values of Mks obtained here agree with those obtained from sedimentation‐viscometric and sedimentation‐diffusion measurements. The macromolecules in both systems show different rigidities.

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