Abstract
Polarized light-induced orientation in azo-dyes covalently bonded to styrene copolymer (AzoPSCMS) was investigated by using polarized UV–VIS spectroscopy. It was found that thermal isomerization and photoisomerization was slower and a photoinduced dichroism was larger than azo-dyes doped in polystyrene. The covalent linkage to a polymer chain may suppress both the mobility required for the isomerization and the rotational diffusion of the azo-moiety. The trans→ cis photoisomerization was induced by ultraviolet (UV) light, whereas light with visible wavelength was used to drive the trans↔ cis photoisomerization. A high repetition of “trans– cis– trans” isomerization cycles achieved under visible light plays an important role for the photoinduced reorientation. Therefore, the high repetition of the “trans– cis– trans” cycle and suppression of the rotational diffusion by the covalent linkage to a polymer are the two important factors for the photoinduced reorientation of azo-dyes in bulk polymer matrix.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Photochemistry & Photobiology, A: Chemistry
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
