Influence of AlCl_3 on the optical properties of new synthesized 3-armed poly(methyl methacrylate) films

Authors

ADNAN KURT

DOI

10.3906/kim-0903-29

Abstract

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 AlCl_3 content. The wide band tails increased in width and the optical energy gap decreased from 2.39 to 1.28 eV as the AlCl_3 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.

First Page

67

Last Page

80

Recommended Citation

KURT, ADNAN (2010) "Influence of AlCl_3 on the optical properties of new synthesized 3-armed poly(methyl methacrylate) films," Turkish Journal of Chemistry: Vol. 34: No. 1, Article 7. https://doi.org/10.3906/kim-0903-29
Available at: https://journals.tubitak.gov.tr/chem/vol34/iss1/7