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首页> 外文期刊>Zhidkie Kristally i Ikh Prakticheskoe Ispol'zovanie >MOLECULAR-OPTICAL AND STRUCTURAL ANISOTROPY OF UNIAXIAL SINGLE-DOMAIN/POLYDOMAIN FILMS OF CONJUGATED POLYMER F8BT WITH AXIAL/PLANAR ORIENTATION OF MACROMOLECULES
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MOLECULAR-OPTICAL AND STRUCTURAL ANISOTROPY OF UNIAXIAL SINGLE-DOMAIN/POLYDOMAIN FILMS OF CONJUGATED POLYMER F8BT WITH AXIAL/PLANAR ORIENTATION OF MACROMOLECULES

机译：MOLECULAR-OPTICAL AND STRUCTURAL ANISOTROPY OF UNIAXIAL SINGLE-DOMAIN/POLYDOMAIN FILMS OF CONJUGATED POLYMER F8BT WITH AXIAL/PLANAR ORIENTATION OF MACROMOLECULES

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Two types of uniaxial polymer films are used in practice. The first type is single -domain film on orienting substrate with axial orientation of macromolecules with respect to the optical axis of the film n which is parallel to the substrate plane (type OA). The second type is polydomain film on isotropic substrate with in-plane orien-tation of macromolecules and the optical axis of the film n which is perpendicular to the substrate plane (type OP). The molecular-optical anisotropy of a film is defined by the ensemble-averaged anisotropy delta gamma = gamma - gamma perpendicular to of the components gamma j of the polari-zability of the monomer units of a polymer for the light-wave polarizations along (j = ) and across (j = perpendicular to) the optical axis n. The structural anisotropy of the film is described by the orientation order parameters U of the dipole moments m of the electronic (oscillatory) transitions in monomer units of macromolecule with respect to axis n. For films of the same polymer, the values of R delta(lambda) = delta gamma A/delta gamma P and RU = UA/UP characterize the closeness degree of the polydomain film to the ideal two-dimensional polycrystal. In this work, the dependence R delta(lambda) on the light-wavelength lambda in the visible range and the order parameters UA(P) for the dipole moment of the long-wavelength electronic transition in single-domain and polydomain films of the conjugated polymer F8BT were studied. The values R delta(lambda) were determined from the refractive indices nj(lambda) of the films with the local-field tensor components fj(lambda) = 1 + Ljnj2(lambda) - 1. The Lorentz-tensor components Lj were obtained using the depend-ences nj(lambda). The values R delta(lambda) are in agreement with R delta = -2 for two-dimensional polycrystal consisted of the uniaxial crystallites. The parameters UA(P) were deter-mined with the use of the background values nbj and maximal values kjmaxof the components of the complex refractive indices Nj(lambda) = nj(lambda) + ikj(lambda) of the films in the region of their long-wavelength electronic absorption band, taking into account the background values fbj = 1 + Lj(nbj2 - 1). The experimental value RU differs from RU = -2 for two-dimensional polycrystal. This difference reveals the sensitivity of the parameter UP to the orientation disorder of the monomer units of macromole-cules in interdomain regions of polydomain films.

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