Statics and dynamics of hairpins in worm-like main chain nematic polymer liquid crystalsReport as inadecuate




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Abstract : We derive some exact results for the statics of solitary defects « hairpins » in the conformations of nematic main chain worm-like polymer liquid crystals in which there is both a bending and a nematic contribution to the potential energy. It is shown that for a polymer of finite length in mechanical equilibrium there can exist only a finite number of hairpins and that these are all unstable configurations. These results which are also applicable to combs are then used to prove that the destruction of a long single hairpin proceeds via the hairpin reptating along its own length even in the absence of entanglements. The two separate cases of a continuous worm, and a worm consisting of N links are studied. The implications for the frequency dependent dielectric response are discussed.

Mots-clés : dielectric properties of liquids and solutions liquid crystal polymers macromolecular configurations nematic liquid crystals





Author: D.R.M. Williams M. Warner

Source: https://hal.archives-ouvertes.fr/



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