Relaxation Behaviour of Monomer/Liquid Crystal Blends after Exposure to Ultraviolet Light

Autor:	Lahcène Méchernène, Z. Hadjou Belaid, Ulrich Maschke
Rok vydání:	2009
Předmět:	chemistry.chemical_classification Materials science General Chemistry Polymer Condensed Matter Physics Photochemistry chemistry.chemical_compound Monomer chemistry Polymerization Liquid crystal Ultraviolet light Relaxation (physics) General Materials Science Irradiation In situ polymerization
Zdroj:	Molecular Crystals and Liquid Crystals. 502:29-36
ISSN:	1563-5287 1542-1406
Popis:	Polymer Dispersed Liquid Crystal materials were elaborated by in situ polymerization induced phase separation under ultraviolet (UV) radiation. Binary model systems composed of a diacrylate monomer and a liquid crystal (LC), 4-cyano-4′-n-pentyl-biphenyl (5CB), were used as starting materials in the process of polymerization/crosslinking. The optical transmission of the monomer/LC films was monitored as function of time covering the period of exposure to UV-light and the following relaxation processes of the irradiated samples. The off-state transmission shows several characteristic processes, a short time relaxation process which decays within seconds, an unexpected intermediate period where transmission was found to enhance, followed by a long lasting relaxation process which takes tens of minutes to decay completely. A discussion of these processes in terms of the kinetics of phase separation is presented.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3e27edcafc4fd894d137a7abe22d7d65 https://doi.org/10.1080/15421400902813642 Zobrazit plný text záznamu