Abstract
It is shown that films of poly(methyl methacrylate) which contain the thermally-stable photochrome 7,7a-dihydro-2,4,7,7,7a-pentamethylbenzo-[b]-furan-5,6-dicarboxylic anhydride II may be rendered optically dichroic using polarized laser light (λ = 514·5nm). The dichroism is produced by angular-dependent photoselection of photochromic molecules in the photoconversion of photochrome II to fulgide I. The absorption anisotropy has been measured as a function of the angle between the planes of polarization of the pump and probe beams, and it is found to be time-invariant for this photochrome/glassy polymer system at room temperature. It is suggested that the time-dependence of absorption anisotropy of thermally-stable photochromic molecules in host polymer or liquid media should provide a direct means of studying their reorientational motions, and should be applicable over the time-range 10-11 to 10+3 s.
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 callDisclaimer: 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.
