Blue-light-induced processes in a series of azobenzene poly(ester imide)s
PBN-AR
Instytucja
Wydział Fizyki (Politechnika Warszawska)
Źródłowe zdarzenia ewaluacyjne
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Journal of Photochemistry and Photobiology A-Chemistry (25pkt w roku publikacji)
ISSN
1010-6030
EISSN
Wydawca
DOI
URL
Rok publikacji
2017
Numer zeszytu
Strony od-do
177-185
Numer tomu
347
Liczba arkuszy
0.5
Słowa kluczowe
en
Azo polymers
Azo polyimides
Trans-cis photoisomerization
Photoinduced optical anisotropy
Surface relief grating
Streszczenia
Język
en
Treść
We report on a series of photoresponsive azobenzene poly(ester imide)s thermally converted from their precursor poly(ester amic acid)s. Thermal properties as well as ability for efficient photoinduced chromophore orientation and polymer mass transport under linearly polarized blue irradiation were investigated, focusing on the effect of azo chromophore location within polymer chain. The amount of chromophore alignment studied in the experiment on photoinduced birefringence differed by a factor of l.5 between the materials. Despite the fact that the generated birefringence was of the same order of magnitude, very large differences in efficiency of surface relief grating formation were seen. Specific features of photoresponsive behaviour of the polymers were shown to correlate with the presence or the absence of intrachain CH⋯π interaction between azobenzene hydrogen and aromatic imide structure, which was revealed by density functional theory (DFT) calculations. Advantageous chromophore location next to the imide groups for effective light-driven processes was shown.
Inne
System-identifier
WUTf76af95c66df4b948b3cfd9f4116bebd
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