1989年1月1日 · Flow birefringence and viscometry have been employed to investigate a series of polyamido acid samples in the MM range from 6 × 10 3 to 120 × 10 3 in dilute solutions in DMAA and in DMAA plus 0·2 m LiCl. The length of the Kuhn segment A for the polyamido acid molecules in DMAA plus LiCl is 141 × 10 −8 cm and in DMAA alone 187 × 10 −8 cm. Increase in chain rigidity with fall in the ...

1986年1月1日 · The length of the Kuhn segment is:A = 40+ 8 A. STUDY of the hydrodynamic properties of poly-m-phenylene isophthalamide (PPA) in solution in DMAA+3 % LiCI showed [1] that the equilibrium rigidity of the PPA molecules in this solvent is characterized by the length of the Kuhn statistical segment ALio=45 A and the hydrodynamic characteristics ...

1976年1月1日 · Assuming that high exponents a and b for PMPIPA in DMAA+3o LiC1 are only due to volumetric effects, the polymer in question is a flexible-chain polymer and its macromolecules have the conformation of a non-streamlined sphere. When calculating unperturbed dimensions of macromolecules the role of volu- metric effects is excluded by extrapolation ...

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