On the peculiar macromolecular organization of nematic poly(urethane-ester)s

Oriano Francescangeli, Michele Laus, Giancarlo Galli

Risultato della ricerca: Contributo su rivistaArticolo in rivistapeer review

Abstract

The peculiar mesophase structure of a series of thermotropic poly(urethane-ester)s is discussed. The polymers form different nematic phases, namely a nematic mesophase with cybotactic groups and a conventional nematic mesophase. The X-ray diffraction analysis suggests that two types of structural arrangements, namely smectic C-like and conventional nematic structures, coexist inside the cybotactic nematic mesophases, to which different internal degrees of correlation correspond. The correlation length parallel to the director of the nematic mesophase ranges from 38 to 45 Å. In the cybotactic groups the correlation lengths parallel and perpendicular to the director range from 260 to 560 Å and 130 to 270 Å, respectively.

Lingua originaleInglese
pagine (da-a)407-417
Numero di pagine11
RivistaMolecular Crystals and Liquid Crystals
Volume299
DOI
Stato di pubblicazionePubblicato - 1997
Pubblicato esternamente

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