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- W2624280050 abstract "Parmi les differents motifs polyaromatiques mesogenes connus, seuls les derives hexasubstitues du benzene, du triphenylene, du truxene et de l’anthraqulnone presentent une (ou plusieurs) mesophase (s) colonnaire(s) D et/ou une phase nematique lenticulaire ND. Apres avoir propose une reponse simple aux problemes que pose la nomenclature des phases colonnaires : deux parametres cristallographiques — symetrie du reseau bidimensionnel (hexagonal = Dh , rectangle = Dr , oblique = Dob ) ; ordre ou desordre dans les colonnes — suffisent a differencier ces phases. Quelques exemples de substances presentant ce type de mesophase sont donnes. On discute la specificite des textures optiques correspondantes (Dho , Dhd , Drd(pmg) , Drd(pmg) , Drd(cm) , Dob.d ) en mentionnant l’influence de la chiralite sur la phase ND et sur certaines phases colonnaires ([math], [math]). Le polymesomorphisme complexe de ces nouveaux materiaux est passe en revue : sequences “normales”, “inverses”, rentrantes, en discutant l’apport de la methode de l’isomorphie. On propose enfin, un classement simple des phases thermotropes et lyotropes base sur la forme de l’element structural (cylindre fini, disque, feuillet indefini, cylindre indefini, globule)." @default.
- W2624280050 created "2017-06-15" @default.
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- W2624280050 date "1983-01-01" @default.
- W2624280050 modified "2023-10-18" @default.
- W2624280050 title "Molécules discoïdes et polymorphisme mésomorphe" @default.
- W2624280050 doi "https://doi.org/10.1051/jcp/1983800137" @default.
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