Conformations of the main chain and structure of comb-shaped liquid-crystalline poly(methacrylates) with a varying molecular mass

V. P. Shibaev*, E. B. Barmatov, Tao Yongjie, R. Richardson

*Corresponding author for this work

    Research output: Contribution to journalArticle (Academic Journal)peer-review

    3 Citations (Scopus)

    Abstract

    The structure and conformations of comb-shaped LC poly(methacrylates) with a varied length of an alkoxy substituent of a phenylbenzoate mesogenic group in isotropic, nematic, and smectic phases were studied by small-angle neutron scattering. The radii of gyration of a polymer chain in direction parallel and perpendicular to the director of a liquid crystal R and R were measured. The anisotropy of the polymer chain shape in the nematic and smectic phases was found to be R/R ∼ 1.4 and R/R ∼ ·2.7, respectively, thereby indicating the oblate conformation of macromolecules. It was demonstrated that the radii of gyration of the polymer in the smectic phase depends on the degree of polymerization z = 42-406 through the following analytical dependence R = (0.78 ± 0.04)z(0.59 ± 0.06) and R = (1.5 ± 0.4)z(0.3 ± 0.08). It was demonstrated for the first time that the anisotropy of a polymer coil increases with the increasing molecular mass of the polymers.

    Original languageEnglish
    Pages (from-to)1086-1096
    Number of pages11
    JournalPolymer Science Series A
    Volume40
    Issue number10
    Publication statusPublished - 1 Jan 1998

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