Comparative dielectric and thermally stimulated-depolarization-current studies of the liquid crystal dimers 1¿,9¿-bis(4-cyanobiphenyl-4'-yl) nonane and heptane and a binary mixture between them, close to the glass transition

We have performed dielectric spectroscopy and thermally stimulated-depolarization-current experiments to study the molecular dynamics of the twist-bend nematic phase close to the glass transition of two members of the 1¿,7'-bis(4-cyanobiphenyl-4'-yl)alkane homologous series ( CB n CB ): th...

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Detalles Bibliográficos
Autores: Sellarès González, Jordi|||0000-0001-7525-3166, Diego Vives, José Antonio|||0000-0002-2042-2476, López Pérez, David Orencio|||0000-0002-9522-8440, Salud Puig, Josep|||0000-0002-9359-8122, Robles Hernández, Beatriz, de la Fuente Lavin, Maria Rosario, Cañadas Lorenzo, Juan Carlos|||0000-0002-2512-2157, Mudarra López, Miguel|||0000-0002-0371-2252, López de Rioja, Víctor|||0000-0003-4485-0616, Levit Valenzuela, Rafael, Díez Berart, Sergio|||0000-0002-7241-9009
Tipo de recurso: artículo
Fecha de publicación:2022
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/377005
Acceso en línea:https://hdl.handle.net/2117/377005
https://dx.doi.org/10.1103/PhysRevE.106.054702
Access Level:acceso abierto
Palabra clave:Solid state physics
Polymers
Crystalline polymers
Physical Systems
Dielectrics
Nematic liquid crystals
Thermotropic liquid crystals
Condensed Matter
Materials & Applied PhysicsPolymers & Soft Matter
Física de l'estat sòlid
Polímers
Polímers cristal·lins
Àrees temàtiques de la UPC::Física
Descripción
Sumario:We have performed dielectric spectroscopy and thermally stimulated-depolarization-current experiments to study the molecular dynamics of the twist-bend nematic phase close to the glass transition of two members of the 1¿,7'-bis(4-cyanobiphenyl-4'-yl)alkane homologous series ( CB n CB ): the liquid crystal (LC) dimers CB9CB and CB7CB, as well as a binary mixture of both. By doping CB9CB with a small quantity of CB7CB, the crystallization is inhibited when cooling the sample down, while the bulk properties of CB9CB are retained and we can investigate the supercooled behavior close to the glass transition. The study reveals that the inter- and intramolecular interactions of the mixture are similar to those of pure CB9CB and confirms that there is a single glass transition in symmetric LC dimers.

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