Ismayil, . and Ravindrachary, V and Bhajantri, Rajashekhar F and Praveena, S D (2010) Optical and microstructural studies on electron irradiated PMMA:A positron annihilation study. Polymer Degradation and Stability, 95. ISSN 1554–1563

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Abstract

The effect of electron irradiation on the free volume related microstructural and optical properties of Poly (methyl methacrylate) have been studied using Positron Annihilation and other techniques. The FTIR spectral study on the irradiated films suggests the existence of C]C group and is understood by invoking the carbonaceous clusters as a consequence of chain scission in PMMA. Using UVeVisible absorption spectra the optical parameters like optical energy bandgap and activation energy were determined and the variation of these parameters suggests the existence of defects within the irradiated sample. Following Robertson’s theory, the carbonaceous cluster size is estimated and it increases with increase in electron dose. The XRD study indicates the enhancement of amorphous nature of the film due to chain scission by irradiation. The Positron annihilation result shows that electron irradiation affects the free volume relatedb microstructure and the carbonaceous clusters may act as positron scattering centers.

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