Dynamo-optical properties of poly(naphthylene oxadiazole)s in sulphuric acid

Diffusion and Flow Birefringence of Poly(naphthoyleneimide benzimidazole) in Concentrated Sulfuric Acid

“…Researching the synthesis of new polyheteroarylenes has provided a wide field for the experimental treatment of the macromolecule conformation by methods of molecular hydrodynamics and dynamo-optics. − Investigation of poly(amide benzimidazole) (PABI) molecular properties has shown 3,4 that the conformation of the PABI molecules is determined by peculiarities of the repeat chain unit chemical structure, which are the cause of the macromolecule chain coiling in solution and may be classified as some kind of molecule flexibility mechanism. Three such mechanisms for the PABI chain may be distinguished.…”

“…Researching the synthesis of new polyheteroarylenes has provided a wide field for the experimental treatment of the macromolecule conformation by methods of molecular hydrodynamics and dynamo-optics. [1][2][3][4][5][6] Investigation of poly(amide benzimidazole) (PABI) molecular properties has shown 3,4 that the conformation of the PABI molecules is determined by peculiarities of the repeat chain unit chemical structure, which are the cause of the macromolecule chain coiling in solution and may be classified as some kind of molecule flexibility mechanism. Three such mechanisms for the PABI chain may be distinguished.…”

“…With this aim, hydrodynamic and dynamo-optical properties were analyzed over a wide range of molecular weight from 6.7 × 10 3 to 2.5 × 10. 5 The M dependence of the translational diffusion coefficient, D, the shear optical coefficient, ∆n/∆τ, the intrinsic orientation of the macromolecules in the flow, [ /g], and the intrinsic viscosity, [η], were established as well as the macromolecule conformation. Results thus obtained indicate the rigid-chain behavior of the PNI molecules.…”

“… The effect of changes in chemical structure on the equilibrium and kinetic behavior is examined for fully cyclic poly(naphthoyleneimide benzimidazole) (PNI) molecules in dilute solution in 96% sulfuric acid. With this aim, hydrodynamic and dynamo-optical properties were analyzed over a wide range of molecular weight from 6.7 × 10 3 to 2.5 × 10 . The M dependence of the translational diffusion coefficient, D , the shear optical coefficient, Δ n /Δτ, the intrinsic orientation of the macromolecules in the flow, [χ/ g ], and the intrinsic viscosity, [η], were established as well as the macromolecule conformation.…”