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Improving Holographic Writing Performance of Photo-Orientable Azobenzene Polymers by Molecular Glasses

Title data

Probst, Christian ; Meichner, Christoph ; Audorff, Hubert ; Walker, Roland ; Kreger, Klaus ; Kador, Lothar ; Schmidt, Hans-Werner:
Improving Holographic Writing Performance of Photo-Orientable Azobenzene Polymers by Molecular Glasses.
In: Journal of Polymer Science Part B: Polymer Physics. Vol. 54 (15 October 2016) Issue 20 . - pp. 2110-2117.
ISSN 1099-0488
DOI: https://doi.org/10.1002/polb.24120

Abstract in another language

Long-term stable holographic volume gratings in azobenzene-containing films have potential applications as forgery-proof security features or in holographic data storage. However, azobenzene-based polymer systems often lack sufficiently high writing speeds. Here, an approach to improve the holographic writing performance of photo-orientable azobenzene-containing polymers by blending with azobenzene molecular glasses is presented. The molecular glass enhances the photo-plastification effect and, consequently, the writing speed. This concept of improving the holographic performance of photo-orientable azobenzene polymers with azobenzene molecular glasses is demonstrated with a homopolymer and two block copolymers. In the azobenzene homopolymer, an addition of 10 wt % of the molecular glass leads to a doubling of the writing speed. Simultaneously, the long-term stability of inscribed gratings is maintained. In case of the block copolymers, the molecular glass is present in the polystyrene matrix and accumulates in the azobenzene minority phase. Adding 5–10 wt % of molecular glass improves the writing speed of the azobenzene block copolymer by a factor of 3–4. An addition of 15 wt % of molecular glass to the block copolymer containing azobenzene and nonphotoactive mesogenic side groups reduces the writing time by a factor of 15 and the long-term stability of the gratings is retained.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: ISI:000383619800010
Keywords: azo polymers; molecular glasses; blends; cooperative effects; holography
Institutions of the University: Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry I
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry I > Chair Macromolecular Chemistry I - Univ.-Prof. Dr. Hans-Werner Schmidt
Profile Fields
Profile Fields > Advanced Fields
Profile Fields > Advanced Fields > Polymer and Colloid Science
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Institute of Macromolecular Research - BIMF
Research Institutions > Affiliated Institutes
Research Institutions > Affiliated Institutes > Bavarian Polymer Institute (BPI)
Result of work at the UBT: Yes
DDC Subjects: 500 Science
500 Science > 500 Natural sciences
500 Science > 530 Physics
500 Science > 540 Chemistry
Date Deposited: 21 Feb 2017 08:51
Last Modified: 26 Apr 2019 06:05
URI: https://eref.uni-bayreuth.de/id/eprint/35687