The hydrodynamic and conformational properties of poly- p-phenyleneoxadiazole in solutions

• Published in: Polymer science USSR 1980, Vol.22 (1), p.149-161
• Main Authors: Tsvetkov, V.N., Novakovskii, V.B., Mikhaylova, N.A., Volokhina, A.V., Raskina, A.B.
• Format: Article
• Language: English
• ISSN: 0032-3950; 1878-268X
• DOI: 10.1016/0032-3950(80)90430-X

The diffusion coefficients D and intrinsis viscosities [η] have been measured for 23 poly- p-phenyleneoxadiazole specimens in sulphuric acid. Molecular weights of the specimens have been calculated from the experimental values of D and [η] for different theoretically possible values of the hydrodynamic parameter A 0. It is shown that the experimental data agree well with theories of translational friction and intrinsic viscosity of vermicular chains when values of the molecular parameters are as follows: A 0 = 3·6 × 10 −10 erg/deg, monomer unit length ψ = 7·2 A ̊ , Kuhn segment length A ≈ 100 A ̊ , hydrodynamic diameter of the molecular chain d ≈ 6 A ̊ . Relationships determining the dependence of D on M D η and of [η] on M D η are adduced.