Adnan KURT

158138

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

Three-armed poly(methyl methacrylate)[PMMA] was synthesized by atom transfer radical polymerization at 100 °C using benzene-1,3,5-triyl tris(4-(bromomethyl) benzoate as 3-armed initiator and a cuprous(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.

Anahtar Kelimeler:

Optical constants, optical band gap, dispersion parameters, thin films, ATRP, PMMA.

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

Three-armed poly(methyl methacrylate)[PMMA] was synthesized by atom transfer radical polymerization at 100 °C using benzene-1,3,5-triyl tris(4-(bromomethyl) benzoate as 3-armed initiator and a cuprous(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.,

Turkish Journal of Chemistry-Cover

ISSN: 1300-0527
Yayın Aralığı: 6
Yayıncı: TÜBİTAK

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