Effect of Electron beam Irradiation on the Optical Properties of Methyl Red doped PMMA Polymer Composites

Ismayil, . and Vasachar, Ravindrachary and Bhajantri, Rajashekhar F and Praveena, S D (2011) Effect of Electron beam Irradiation on the Optical Properties of Methyl Red doped PMMA Polymer Composites. In: International Conference on Materials for Advanced Technologies (ICMAT -2011), 26 June to 1 July, 2011, Suntec, Singapore. (Submitted)

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Composite films of 0.5wt% Methyl Red (C15H15N3O2) doped Poly(methyl methacrylate) (PMMA; CH2CH3CCOOCH3) were prepared using solution casting technique. These films were subjected to 8 MeV electron beam for different doses (0, 50, 100, 150, 200, 250, 300 kGy) using Microtron available at Mangalore University, India. The structural modifications and corresponding optical properties of these irradiated films were investigated using FTIR, UV-Visible and Fluorescence microscopic imaging techniques. The appearance of new peaks and peak shifts in FTIR spectra indicates the structural modifications in the polymer composite due to chain scission upon irradiation. The UV-Visible spectral study shows a red shift with decrease in optical absorption of the peaks upon irradiation. Three optical band gaps and three activation energies for the irradiated Methyl Red doped PMMA films were estimated using the observed optical band edges in UV-Visible spectra. The variation of optical band gap and activation energies with different electron doses indicates the existence of additional levels within the irradiated samples due to chain scission, which reflects the modification in the microstructure of the polymer composite. The fluorescence microscopic imaging of these samples shows interesting fluorescent properties, which signifies this material as a good candidate for Write Once Read Many or digital optical storage devices.

Item Type: Conference or Workshop Item (Poster)
Subjects: Engineering > MIT Manipal > Physics
Depositing User: Users 70 not found.
Date Deposited: 16 Jul 2011 04:14
Last Modified: 29 Jul 2011 06:39
URI: http://eprints.manipal.edu/id/eprint/686

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