Poly(etherimide)s and poly(esterimide)s containing azobenzene units: Characterization and study of photoinduced optical anisotropy

Photoinduced birefringence of novel azobenzene poly(esterimide)s; the effect of chromophore substituent and excitation conditions

“…The decomposition temperatures T d and T 10 (based on 5% and 10% weight loss) were in the range of 293-308 °C and 325-347 °C, respectively. The obtained values of thermal decomposition temperatures are similar to those obtained for other poly(esterimide)s containing either cyano and nitro substituent in para position[16]. Azopolymers containing covalently bonded chromophore usually are characterized by two or three degradation steps[26].…”

“…Despite the fact that the azopolymers have been intensively investigated in the past 20 years, further improvement of their performance, such as the response time, long-term stability, the maximum attainable birefringence value is still required [16][17][18][19]. Understanding the correlation between the structural features such as the chromophore or polymer backbone architecture and the polymer photoresponsive behaviour is crucial in searching for the polymers with the required physical and optical properties.…”

“…one of the phenyl rings of azochromophores is a part of a polymer backbone. According to our previous study this type of linkage may be one of the factors responsible for a low birefringence relaxation in dark [16]. Searching for the polymers that have the imide rings in the backbone and exhibit large and slowly decaying birefringence as well as good processability comprises one of our current scientific interests.…”

Thermal, optical and photoinduced properties of a series of homo and co-polyimides with two kinds of covalently bonded azo-dyes and their supramolecular counterparts

“…The appearance of the absorption band at around 2971 cm À1 is assigned to the vibration band of CH 2 indicates the introduction of the chromophore into the polymer chain of the polyimide precursor. In the case of polymers containing chromophore DR13 the FTIR spectrum showed absorption bands at 1504 and 1355 cm À1 attributed to NO 2 group [40].…”

Optical properties of TiO2 and disperse red-19 composite

“…Control of molecular orientation in polymers or inorganic matrices has been focused on efforts due to many interesting properties and potential applications in various fields [1][2][3][4]. Anisotropic molecular orientation in polymer or inorganic matrix gives to anisotropic electrical conductivity and nonlinear optical properties including polarized photoluminescence, electroluminescence, and nonlinear optical property.…”