TY - JOUR
T1 - On the peculiar macromolecular organization of nematic poly(urethane-ester)s
AU - Francescangeli, Oriano
AU - Laus, Michele
AU - Galli, Giancarlo
N1 - Funding Information:
This work was supported from the Minister0 dell'universitii e della Ricerca Scientifica e Tecnologica of Italy.
PY - 1997
Y1 - 1997
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0030681636&partnerID=8YFLogxK
U2 - 10.1080/10587259708042021
DO - 10.1080/10587259708042021
M3 - Article
SN - 1058-725X
VL - 299
SP - 407
EP - 417
JO - Molecular Crystals and Liquid Crystals
JF - Molecular Crystals and Liquid Crystals
ER -