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Molecular design and synthesis of copolymers with large photoinduced birefringence
Molecular design and synthesis of copolymers with large photoinduced birefringence
- Source :
-
Journal of Photochemistry & Photobiology A: Chemistry . Sep2006, Vol. 182 Issue 3, p262-268. 7p. - Publication Year :
- 2006
-
Abstract
- Abstract: In order to achieve both large photoinduced birefringence (Δn PI) and good long-term stability, we designed and synthesized four series of side-chain-type copolymers consisting of a photoresponsive azo moiety and a long π-conjugated moiety. Chemical and physical characterization, such as the estimation of Δn PI and its dependence on the copolymerization ratio of the two functional moieties, have been compared. Consequently, fairly large value (observed highest value was 0.244) and superior stability of Δn PI have been achieved in a copolymer consisting of the 2-[4-(4-cyanophenylazo)phenoxy]ethyl moiety and the 2-[2-methyl-4-(4-phenylazophenylazo)phenoxy]ethyl moiety at a 50:50 molar ratio (PCDY50). Furthermore, an unusual dependence of Δn PI on the copolymerization ratio has been found in some copolymer series. The dependence has been phenomenologically explained by assuming the formation of a supramolecular assembly between the different moieties, that might induce molecular cooperative photo-alignment resulting in a large macroscopic Δn PI. In addition, durability of the copolymer with respect to Δn PI has been examined using PCDY50. As a result, it was confirmed that the recording and erasing process could be repeated more than 105 times at certain optical conditions. [Copyright &y& Elsevier]
- Subjects :
- *POLYMERS
*COPOLYMERS
*DOUBLE refraction
*VOIGT effect
Subjects
Details
- Language :
- English
- ISSN :
- 10106030
- Volume :
- 182
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Journal of Photochemistry & Photobiology A: Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 22011528
- Full Text :
- https://doi.org/10.1016/j.jphotochem.2006.04.023