Interfacial conversion for poly(para-phenylenevinylene) at a cholesteric liquid crystal surface
| Autor: | Rafaeel H. L. Kiebooms, Tomohisa Miyazawa, Kimio Kunimori, Keiichi Tomishige, Hiromasa Goto, Yuki Akiyama, Kazuo Akagi |
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| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: |
pi-conjugated polymers
UV-vis spectroscopy Materials science Polymers and Plastics Cholesteric liquid crystal Infrared spectroscopy General Chemistry Conjugated system Surfaces Coatings and Films chiral Crystallography Ultraviolet visible spectroscopy liquid crystals Liquid crystal Absorption band Polymer chemistry Materials Chemistry ComputingMethodologies_DOCUMENTANDTEXTPROCESSING Texture (crystalline) films Absorption (chemistry) |
| Zdroj: | JOURNAL OF APPLIED POLYMER SCIENCE. 107(1):438-443 |
| ISSN: | 0021-8995 |
| Popis: | application/pdf A new approach for the preparation of poly (para-phenylenevinylene) (PPV) with an ordered structure is presented. PPV is synthesized by a precursor method using a cholesteric liquid crystal medium. The resultant PPV film is observed to have a cholesteric fingerprint-like texture, indicating replication of the cholesteric liquid crystal medium. Infrared absorption measurements confirm that the PPV has essentially the same molecular structure as normal PPV film. Ultraviolet–visible absorption measurements show that the absorption band due to p2p* transition of the conjugated main-chain is located at 402 nm. The conversion is found to occur at the interface with the cholesteric liquid crystal medium as a mechanical process. |
| Databáze: | OpenAIRE |
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