Induction of the vector polyphotochromism in side-chain azopolymers
| Autor: | Alfonso Martinez-Felipe, Irakli Chaganava, Luis Oriol, George Kakauridze, Milagros Piñol, Barbara Kilosanidze |
|---|---|
| Přispěvatelé: | Shota Rustaveli National Science Foundation, Science and Technology Center in Ukraine |
| Rok vydání: | 2018 |
| Předmět: |
Discrete mathematics
Vector polyphotochromism business.industry Chemistry General Chemical Engineering Interference quenching General Physics and Astronomy 02 engineering and technology General Chemistry Light-manipulating organic material 021001 nanoscience & nanotechnology 01 natural sciences 010309 optics Photoanisotropy Side-chain azopolymer Optics 0103 physical sciences Side chain Center (algebra and category theory) Polarization-sensitive material 0210 nano-technology business |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 1010-6030 |
| DOI: | 10.1016/j.jphotochem.2017.09.067 |
| Popis: | The phenomenon of vector photochromism was observed in some high-efficient polarization-sensitive materials depending on the radiant exposure of the inducing linearly polarized actinic light. When radiant exposure exceed certain value specific to each material, a sharp change in the transmission spectrum of the probing linearly polarized nonactinic beam is observed after analyzer. While probing with unpolarized light the transmission spectrum is practically unchanged and does not depend on the magnitude of the radiant exposure. The mechanism of this phenomenon is discussed. The effect is an interference nature and depends on the path difference between the ordinary and extraordinary rays in material with photo-induced anisotropy. It is shown that the kinetics of this effect depends on the photosensitive layer thickness and the concentration of the chromophore.The beams with a wavelength away from the absorption band of the material were used as a probing. It is shown that in this case birefringence has made the main contribution in photoanisotropy. The experiments were carried out for polarization-sensitive materials with varying degrees of components integration, in particular, two synthesized side-chain azopolymers obtained by immobilization of polar azo dyes on polymethylmethacrylate backbone. It is shown that the maximum value of the birefringence Δn = 0.162 achieved in azopolymers with covalently bonded components. In this case a third order of interference of the probing beam is observed. The authors gratefully acknowledge support by the Shota Rustaveli National Science Foundation [grants number 04/06 and AR/209/6-120/14] and Science& Technology Center in Ukraine [grant number 6069]. |
| Databáze: | OpenAIRE |
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