The flow birefringence and conformation properties of poly- p-phenylenoxadiazole molecules in solutions

The flow birefringence (FBR) of sulphuric acid solutions of poly- p-phenyleneoxadiazole (PPOD) samples having various mol.wt. has been determined. The characteristic angles of orientation [χ/g] increase with the mol.wt. M as a linear function of M[η]([η]-intrinsic viscosity). The proportionality fac...

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Bibliographic Details
Published in:Polymer science USSR 1980, Vol.22 (5), p.1133-1143
Main Authors: Tsvetkov, V.B., Mikhailova, N.A., Novakovskii, V.B., Volokhina, A.V., Raskina, A.B.
Format: Article
Language:English
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Summary:The flow birefringence (FBR) of sulphuric acid solutions of poly- p-phenyleneoxadiazole (PPOD) samples having various mol.wt. has been determined. The characteristic angles of orientation [χ/g] increase with the mol.wt. M as a linear function of M[η]([η]-intrinsic viscosity). The proportionality factor is slightly larger than the theoretical value for rigid kinetic molecular chains; this can be explained by some polydispersity in the samples. The given FBR [n]/[η] changes with the M in accordance with the theory for kinetically rigid coiled chains. The analysis of this dependence gave the length of the Kuhn segment as A ≈ A ̊ which is twice that got earlier from the hydrodynamic data. Barrier σ to internal rotation inthe PPOD chains is about 1·5 according to FBR, which is close to that got earlier for aromatic polyamides but much lower than that typical for flexible-chain polymers.
ISSN:0032-3950
1878-268X
DOI:10.1016/0032-3950(80)90212-9