Synthesis and characterization of a new family of photoactive liquid crystalline polyesters based on α‐methylstilbene |
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| Authors: | Bartosz Tylkowski Krzysztof A Bogdanowicz Veronica Ambrogi Albena Lederer Violetta Patroniak Marta Giamberini |
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| Affiliation: | 1. Departament d'Enginyeria Química, Universitat Rovira i Virgili, , 43007 Tarragona, Spain;2. Centre Tecnològic de la Química de Catalunya, Carrer Marcellí Domingo, , 43007 Tarragona, Spain;3. Dipartimento di Ingegneria dei Materiali e della Produzione, Università di Napoli ‘Federico II’, , 80125 Napoli, Italy;4. Leibniz Institute of Polymer Research Dresden, , 01069 Dresden, Germany;5. Faculty of Chemistry, Adam Mickiewicz University, , 60‐780 Poznan, Poland |
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| Abstract: | A liquid crystal polyester and two liquid crystal copolyesters containing α‐methylstilbene moieties and aliphatic or aromatic spacers in the backbone were synthesized in good yields, with the aim of using them for photosensitive microcapsule preparation. The synthesized polymers were fully characterized with respect to thermal stability, type of mesophase, molecular weight and E–Z photoisomerization. Combination of monomers with different structures allowed adjustment of the polymer characteristics such as degree of crystallinity and glass transition temperature, as verified using X‐ray diffraction, polarized optical microscopy and differential scanning calorimetry. Quantitative 1H NMR and UV‐visible experiments were performed in order to investigate E–Z photoisomerization after photoirradiation at 364 nm. Finally, a membrane based on one of these polymers was prepared and it was found that its wettability increased on photoirradiation. © 2013 Society of Chemical Industry |
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| Keywords: | liquid crystalline polyesters α ‐methylstilbene E– Z photoisomerization photoactive membranes |
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