Dynamo-optical and electro-optical properties of solutions of diphenyl-substituted poly-p-phenyleneterephthalate in polar and nonpolar solvents
✍ Scribed by V.N. Tsvetkov; L.N. Andreeva; A.P. Filippov; E.V. Belyaeva; A.Ju. Bilibin; A.R. Stepanova
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 392 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0014-3057
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✦ Synopsis
Flow and electric birefringence have been investigated for solutions of a number of fractions of a para-aromatic polyester using dioxane and dichloroacetic acid as solvents. It was found that, on passing from a nonpolar (dioxane) to a polar solvent, the optical and hydrodynamic properties of the chain do not alter whereas electro-optical characteristics undergo drastic changes.
It was shown that in dioxane the hydrodynamic and dynamo-optical characteristics of the polyester under investigation correspond to those of a rigid-chain polymer, whereas the electro-optical correspond to those of a flexible-chain polymer. This unique combination of properties is due to the specific features of the dipole structure of the monomer unit and a considerable difference in the longitudinal and transverse dipole rigidities of the chain of this polyester.