Large and highly stable photoinduced birefringence in poly(amideimide)s with two azochromophores per structural unit
PBN-AR
Instytucja
Wydział Matematyki, Fizyki i Chemii (Uniwersytet Śląski w Katowicach)
Źródłowe zdarzenia ewaluacyjne
Informacje podstawowe
Główny język publikacji
EN
Czasopismo
OPTICAL MATERIALS
ISSN
0925-3467
EISSN
Wydawca
URL
Rok publikacji
2015
Numer zeszytu
Strony od-do
199-206
Numer tomu
39
Identyfikator DOI
Liczba arkuszy
0,4
Słowa kluczowe
EN
azopolymers
Optical storage
Photoinduced birefringence
Polyimides
Trans–cis isomerization
Streszczenia
Język
EN
Treść
We present a series of novel poly(amideimide)s containing two covalently bonded azobenzene chromophores in the polymer repeating unit. The chromophores possess different substituent in para position such as fluorine, hydroxyl, methyl or do not contain any of them. The synthesized polymers were characterized by 1H NMR, FTIR spectroscopies and elemental analysis. The polymers showed high glass transition temperatures (250–280 °C), which were significantly separated from the temperatures of thermal decomposition (345–590 °C). The photoinduced birefringence measurements were performed for continuous wave irradiation at 405 nm. A very large, as for polyimides, birefringence of 0.06 was observed with the growth dynamics dependent on the chromophore substituent. The generated birefringence exhibited an exceptionally low relaxation. Apart from the poly(amideimide) with the methyl substituent it decreased by only 1.5% just after switching off the excitation light, and maintained its level during the next 500 s.
Inne
System-identifier
0192600115756
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