Influence of AlCl3 on the optical properties of new synthesized 3-armed poly(methyl methacrylate) films

Authors : Adnan KURT

Pages : 67-80

View : 18 | Download : 8

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Three-armed polyinsert ignore into journalissuearticles values(methyl methacrylate);[PMMA] was synthesized by atom transfer radical polymerization at 100 °C using benzene-1,3,5-triyl trisinsert ignore into journalissuearticles values(4-insert ignore into journalissuearticles values(bromomethyl); benzoate as 3-armed initiator and a cuprousinsert ignore into journalissuearticles values(I); bromide/2,2`-bipyridine catalytic system. The characterization of PMMA was confirmed by FT-IR, 1H-NMR, GPC, DSC, and TGA techniques. Optical absorption measurements were also studied by UV-VIS technique. Transmittance and reflectance measured in the wavelength range 300-700 nm were used to calculate the optical constants. The changes in dispersion and Urbach parameters were investigated as a function of AlCl3 content. The wide band tails increased in width and the optical energy gap decreased from 2.39 to 1.28 eV as the AlCl3 content increased from 0% to 15%. Analysis revealed that the type of transition is the indirect allowed one.
Keywords : Optical constants, optical band gap, dispersion parameters, thin films, ATRP, PMMA