By Anselm C. Griffin, Shailaja R. Vaidya, Marcus L. Steele (auth.), Alexandre Blumstein (eds.)
This ebook originated within the lawsuits of the second one Symposium on Polymeric Liquid Crystals held through the department of Polymer Chemistry within the framework of the 1983 Fall assembly of the yankee Chemical Society. on the First Symposium in 1977, the literature during this box might be encompassed in one quantity. To day, that's not attainable. the sector of Polymeric Liquid Crystals grew, and keeps to develop, at a truly speedy speed. at the moment, we all know of each significant mesophase in its polymeric shape and of polymeric glasses, elastomers and fluids of their liquid crystalline shape. each year, new polymeric mesophases are being found. the purpose of this booklet is to move past a compilation of papers provided on the 1983 ACS Fall assembly. it really is conceived as a studying software for the good thing about the sci entist attracted to Polymeric Liquid Crystals. The booklet is split into 3 sections. the 1st part comprises articles discussing artificial, physico chemical, structural and rheological points of Polymeric Liquid Crystals of their generality. A bankruptcy on tools at present utilized in this box is usually incorporated. There also are chapters on theoretical and class features of PLCs. those self-contained instructional chapters offer an advent to this box in addition to to the categorical papers given within the publication. they supply an exhaustive disguise age of literature at the topic from its inception to the present.
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5). They are unstable and after some time· or by further heating they become smaller and smaller and to a great extent disappear. As a consequence, when the temperature is near TNI' samples contain no threads and show homogeneous color across large areas between crossed polarizers. Si~~lar microscopic observations for the lyotropic nematic have been reported by Millaud et al phase of a poly(paraphenylenetereph thalamide). _ 2 5:+1;0:0 Fig. 4. 5:+1 ·0:1! ' 6 5 =-..!. 2 5:-1 Schematic diagram of molec~lar traj~ctories associated with disclinations of strength- 1/2 or- 1.
7. Typical planar texture obtained at 260°C by the addition of an optically active compound to the polyazomethine III. The same effect can be obtained by copolymerization or copolyc~ndensation of a. repeat :mit, known to 2 ,-ie~·~ a t~g,-motropic nema- t~c homopolymer,w~th a ch~ral compound ' ' 3/ • Finkelmann et al. x1 I -fcH 2-c I C=O I =f cH R2 2 + C=O x2 I 0 R1 R2 I to-@-coo --@-@-ocH 3 nr 6 =+ CH -t; 2 I +cH 2-c1 0 I R1 CH 3 0 -@-coo -@-cH::N-9H-@ CH 3 Observations under a polarizing microscope indicate that above their glass transition temperature these copolymers display a cholesteric planar Grandjean texture.
_ coo -tcH 2to ~coo -@--ocH 3 2 X and -CH - 2 CH- I coo-@- coo-@ XI which were found optically negative. It is unclear whether this was due to an erroneous mesophase identification owing to the lack of typical texture or to the chemical structure of polymers. Indeed a possible explanation for this specific behavior might be a disturbing effect of the main chain which has to be expected when the polymer backbone and the side chain motions are little or not decoupled by a flexible spacer. Coupling With External Fields Macromolecules capable of forming mesophases are characterized 46 by asymmetrical shapes and, for this reason, would be expected to have anisotropic magnetic susceptibilities and dielectric constants.
