Comb-Shaped Polymers and Liquid Crystals by N.A. Platé, V.P. Shibaev

By N.A. Platé, V.P. Shibaev

To the yank version we're happy that our modest paintings, released it slow in the past in Russian in Moscow* and which attracted the eye of polymer experts, t will now be to be had to the EngJish conversing viewers of scientists - chemists, physicists, and technologists engaged in growing new different types of polymer materi als for contemporary expertise and dealing at the primary prob lems of the solid-state physics and constitution of polymer- because of the initiative of Plenum Press. In polymer technological know-how, the Eighties have been marked by means of the delivery of a brand new box and a brand new clinical pattern relating to the dis covery and learn of a formerly unknown type of polymers thermotropic liquid-crystalline polymers - and the additional improvement of the basic theoretical recommendations of the liquid-crystalline (mesomorphic) kingdom of macromolecular com kilos. This nation is a part kingdom in thermodynamic equi librium characterised by way of the anisotropy of the constitution and houses because of one-dimensional or two-dimensional ordering. Such platforms have an ordered yet at the same time labile constitution that may simply be altered via mechanical, electric, or magnetic fields; the polymer method then acquires special actual and optical houses. those prop erties, that are got within the liquid-crvstalline country, are then fastened within the strong on the working temperatures. *N. A. Plate and V. P. Shibaev. Comb-Shaped Polymers and Li quid Crystals [in RussianJ. Khimiya, Moscow (1980). tSee the evaluation of this publication by means of H. Mark in J. Polym. Sci. Polym. Lett. Ed., 20, 139 (L982).

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75 A). With this value of k, we find from Eq. 4) that pmax 2. The hexagonal packing of "rotated" side chains should thus be manifest in the diffraction pattern by the presence of only two orders of diffraction. 5). A A similar type of x-ray pattern is also observed for a linear polymer, polyacrylonitrile, whose structure is treated as gas crystalline [131]. With comparatively small values of k, the statistical rotation of the molecules results in lattice perturbations and fast attenuation of the interference function maxima.

With this value of k, we find from Eq. 4) that pmax 2. The hexagonal packing of "rotated" side chains should thus be manifest in the diffraction pattern by the presence of only two orders of diffraction. 5). A A similar type of x-ray pattern is also observed for a linear polymer, polyacrylonitrile, whose structure is treated as gas crystalline [131]. With comparatively small values of k, the statistical rotation of the molecules results in lattice perturbations and fast attenuation of the interference function maxima.

4l . 1~'1: ·10 · 90 · 10 · 50 · 10 ·100 · 120 · IS0 · ISD · 110 ·140 ·1&0 ·IS0 20 760 750 740 730 720 710 700 Fig. 18. em " 780 750 740 730 720 710 700 em " IR spectra of atactic and isotactic comb-shaped polymers at "different temperatures: A) atactic PE-1S; B) isotactic PE-lS; C) atactic PEO-lS; D) isotactic PEO-IS [109]. lS). This indicates the gradual disordering of the packing of the aliphatic side chains, which begins at relatively low temperatures, as Fig. lS shows. The transition from orthorhombic to hexagonal packing occurs over a wide range of temperatures, probably due to the successive "accumulation" of conformational perturbations, primarily by the main chains and segments of the adjacent side chains.

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