Abstract
Amorphous orientation with conventional flexible polymers is hindered by the natural tendency to recoil of the molecules, by the lack of a microscopic degree of order, and the occurrence of chain entanglement. Rigid polymers in a nematic mesophase should be more simply oriented than flexible ones since they have no tendency to recoil and exhibit a microscopic order of molecules described by the so-called order parameter. In fact, in order to fully orient the rigid nematic polymers, it is necessary to
-
(1)
increase the order parameter:1
$$S = \frac{1}{2}\left\langle {\left( {3{{\cos }^2}\theta - 1} \right)} \right\rangle $$(1)where θ is the average angle between the molecular axis and the director (a vector representing the average molecular orientation at any point of the liquid1) toward the value S=1 expected for complete orientation;
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(2)
orient the director along the flow direction or, according to an alternative (less precise1) description, to transform the ‘polydomain’ texture (rich in disinclinations) into a ‘monodomain’ texture.2 The overall process is schematized in Fig. 1.
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Ciferri, A. (1987). Spinning from Lyotropic and Thermotropic Liquid Crystalline Systems. In: Ward, I.M. (eds) Developments in Oriented Polymers—2. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3427-6_3
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DOI: https://doi.org/10.1007/978-94-009-3427-6_3
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