A study on the optical properties of three-armed polystyrene and poly(styrene-b-isobutyl methacrylate).(Report): An article from: Polymer Engineering and Science

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From the author: Atom transfer radical polymerization (ATRP) of three-armed polystyrene[PS] and poly(styrene-b-isobutyl methacrylate)[PS-b-PiB[mu]MA] were accomplished using an initiator with tri-active C-Br end group function and cuprous (I) bromide/2,2'-bipyridyne catalytic system. The characterization obtained by FT-IR, [.sup.1]H-NMR, and GPC techniques. The average molecular weight and polydis-persity of PS and PS-b-PiB[mu]MA were determined as 19,800, 29,300 and as 1.37 and 1.15, respectively, which indicates that the constant concentration of growing chains are present throughout the polymerization. The refractive index and extinction coefficient of the samples were determined in the visible range as a function of wavelength. The refractive index dispersion curves of the thin films were fitted by the Cauchy-Sellmeier model. The width of localized states ([E.sub.u]) values changed inversely with optical band gaps ([E.sub.g]) of the films. While the calculated [E.sub.u] values of films for initiator, PS and PS-b-PiB[mu]MA were determined as 2.72, 2.98, and 2.94 eV, the [E.sub.g] values were determined as 3.43; 3.11, and 3.16 eV, respectively. The dispersion parameters of thin films were determined. These parameters changed in the investigated wavelength ranges. POLYM. ENG. SCI., 50:268-277, 2010. [C] 2009 Society of Plastics Engineers

Citation Details
Title: A study on the optical properties of three-armed polystyrene and poly(styrene-b-isobutyl methacrylate).(Report)
Author: Adrian Kurt
Publication:Polymer Engineering and Science (Magazine/Journal)
Date: February 1, 2010
Publisher: Society of Plastics Engineers, Inc.
Volume: 50 Issue: 2 Page: 268(10)

Article Type: Report

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