Accession Number : ADA314651
Title : Azo Polymers for Optical Storage. 13. Photoorientation of Rigid Side Groups Containing Two Azo Bonds.
Descriptive Note : Technical rept.,
Corporate Author : QUEEN'S UNIV KINGSTON (ONTARIO) DEPT OF CHEMISTRY
Personal Author(s) : Meng, X. ; Natansohn, A. ; Rochon, P.
PDF Url : ADA314651
Report Date : 10 SEP 1996
Pagination or Media Count : 31
Abstract : Copolymers of methyl methacrylate with a methacrylate containing a rigid group with two azo bonds (3RM) were prepared and their photoinduced birefringence levels and rates were studied. Birefringence levels of 0.11 for the copolymer with 11.6 mol % azo structural units and 0.13 for the copolymer with 30.0 mol % azo structural units were found; this is higher than the birefringence inducible in typical azo homopolymer containing a chromophore with only one azo group; poly?4'-((2-(acryloyloxy)ethyl) ethylamino)-4-nitroazobenzene) (poly(DR1A)). The birefringence per azo structural unit for a copolymer containing 1.1.6 mol % 3RM.Is about 5 times that-for a DR1A-copolymer with similar azo content, because of the intrinsic structural properties of 3RM (high length diameter ratio). Dichroism in both UV and visible regions of the spectrum contribute to the overall photoinduced birefringence. The rate of inducing birefringence in the 3RM copolymers is lower than in poly (DR1A) and the birefringence. stability (91-96% of the induced birefringence is maintained after the writing laser is off) is much better than that for poly(DR1A) (about 80%). The good stability and slow birefringence growth rate are due to the lesser mobility of the larger older group.
Descriptors : *POLYMERS, *AZOBENZENES, *OPTICAL STORAGE, *RIGIDITY, OPTICS, ULTRAVIOLET RADIATION, METHYL RADICALS, COPOLYMERS, LASERS, CHEMICAL BONDS, VISIBILITY, BIREFRINGENCE, METHACRYLATES, BONDING, WRITING, DICHROISM, ETHYL RADICALS, STRUCTURAL COMPONENTS, NITRO RADICALS.
Subject Categories : Polymer Chemistry
Distribution Statement : APPROVED FOR PUBLIC RELEASE