Accession Number : ADA314645
Title : Azo Polymers for Reversible Optical Storage. 12. Poly ?1- Acryloyl-4-4- (4-Nitrophenylazo)PhenylPiperazine!.
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 : ADA314645
Report Date : 10 SEP 1996
Pagination or Media Count : 32
Abstract : Two azo-containing vinyl monomers, 1-acryloyl-4-4-(4-NITROPHENYLAZO)PHENYLpiperazine! (ANPP) and 1-methacryloyl-4-4-(4-NITROPHENYLAZO)PHENYLpiperazine! (MNPP), were synthesized. MNPP did not polymerize in a few solvents, with a few free radical initiators and at a few temperatures. pANPP is amorphous with a Tg of 156 deg C and decomposes above 230 deg C. Birefrigence can be induced by a polarized laser (514 nm) on a pANPP film to a level of 0.1 and is very stable. Comparison is made with poly(4'-(2-(ACRYLOYLOXY)ETHYL) ETHYLAMINO-4-nitroazobenzene! (pDR1A). Biexponential curve fitting shows a lower writing rate for pANPP. both the slow response to the laser and the higher stability of the photoinduced birefringence are due to the 'rigid' piperazine linkage between azobenzene groups and backbone which prevents the azo groups from rotating freely. pANPP decomposes under long term exposure to the laser.
Descriptors : *POLYMERS, *REVERSIBLE, *OPTICAL STORAGE, POLARIZATION, STABILITY, EXPOSURE(GENERAL), LASERS, SOLVENTS, FREE RADICALS, AZOBENZENES, WRITING, PHENYL RADICALS, NITRO RADICALS, PIPERAZINES, CURVE FITTING.
Subject Categories : Polymer Chemistry
Electrooptical and Optoelectronic Devices
Distribution Statement : APPROVED FOR PUBLIC RELEASE