@article{LavrenkoStrelinaSchulz1997,
  author    = {Lavrenko, Peter N. and Strelina, Irina A. and Schulz, Burkhard},
  title     = {Dynamo-optical properties of poly(naphthylene oxadiazole)s in sulfuric acid},
  year      = {1997},
  abstract  = {Flow birefringence induced in dilute solutions of poly[(1,4-naphthylene)-2,5-diyl-1,3,4-oxadiazole] and poly[2,6-naphthylene)-2,5-diyl-1,3,4-oxadiazole] in conc. sulphuric acid has been investigated. The shear optical coefficient was found for these polymers to be approximately double the value of that obtained in the same solvent for poly[(para-phenylene) -2,5-diyl-1,3,4-oxadiazole]. Rigid-chain behaviour of the polymers was characterized by hydrodynamic and dynamo-optical parameters evaluated with application of the worm-like chain model and the "method of similar structures". Change in optical anisotropy of a chain unit induced by incorporation of naphthylene groups into the main chain has been evaluated.},
  language  = {en}
}
@article{LavrenkoOkatovaSchulzetal.1999,
  author    = {Lavrenko, Peter N. and Okatova, Olga V. and Schulz, Burkhard and Andreeva, Katharina A. and Strelina, Irina A.},
  title     = {Hydrodynamic and dynamo-optical properties of poly(1,3-phenylene-1,3,4-oxadiazole) molecules in sulphuric acid},
  year      = {1999},
  abstract  = {Translational diffusion of the macromolecules, intrinsic viscosity and flow birefringence induced in dilute solutions of poly(1,3-phenylene-1,3,4-oxadiazole) (PMOD) in conc. sulphuric acid has been investigated. Molecular-weight dependences of hydrodynamic and dynamo-optical properties are established over the M range from 8.1 103 to 87 103. Experimental data agree well with the theories developed for translational friction and intrinsic viscosity of the wormlike chains with the following molecular parameters: mass per chain unit ML = 22.7 Dalton/{\AA}, the Kuhn segment length A = 59 ± 4 {\AA}, the chain diameter d = 4 ± 1.5 {\AA}. Hindrance to intramolecular rotation is characterized by the parameter s = 1.7. The shear optical coefficient was found to be approximately 1.7 times lower the value of that obtained in the same solvent for the para-phenylene isomer of this polymer, being in good agreement with higher equilibrium flexibility of the PMOD molecule chains in solutions as determined herein from the hydrodynamic data.},
  language  = {en}
}
@article{LavrenkoAndreevaStrelinaetal.1999,
  author    = {Lavrenko, Peter N. and Andreeva, Katharina A. and Strelina, Irina A. and Garmonova, Tatjana I. and Schulz, Burkhard},
  title     = {Optical anisotropy and flexibility of poly(m-phenylene oxadiazole) in sulfuric acid},
  year      = {1999},
  language  = {en}
}
@article{LavrenkoStrelinaOkatovaetal.1996,
  author    = {Lavrenko, Peter N. and Strelina, Irina A. and Okatova, Olga V. and Schulz, Burkhard},
  title     = {Orientation of naphthylene ring in the new poly(naphthylen-1,3,4-oxadiazole)s molecules},
  year      = {1996},
  language  = {en}
}
@article{LavrenkoSchulzStrelinaetal.1997,
  author    = {Lavrenko, Peter N. and Schulz, Burkhard and Strelina, Irina A. and Okatova, Olga V.},
  title     = {Synthesis and molecular properties of new poly(naphthalene-1,3,4-oxadiazole)s},
  year      = {1997},
  abstract  = {Poly[(1,4-naphthalene)-2,5-diyl-1,3,4-oxadiazole] and poly[(2,6-naphthalene)-2,5-diyl-1,3,4-oxadiazole] have been synthesized and investigated in conc. H2S04, by the flow birefringence method in comparison with poly(1,4- phenylene)-2,5-diyl-1,3,4-oxadiazole]. Changes in conformation parameters and optical anisotropy of a chain unit induced by incorporation of the naphthalene groups into the macromolecule backbone have been evaluated.},
  language  = {en}
}