| Autor: |
N.A. Mikhaylova, V.N. Tsvetkov, A.B. Raskina, V.B. Novakovskii, A. V. Volokhina |
| Rok vydání: |
1980 |
| Předmět: |
|
| Zdroj: |
Polymer Science U.S.S.R.. 22:149-161 |
| ISSN: |
0032-3950 |
| DOI: |
10.1016/0032-3950(80)90430-x |
| Popis: |
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 A0. 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: A0 = 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 MDη and of [η] on MDη are adduced. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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