Electron irradiation induced microstructural modifications in BaCl2 doped PVA: A positron annihilation study

Harisha , A and Ravindrachary, V and Bhajantri, Rajashekhar F and Ismayil, . and Sanjeev, Ganesh and Poojary, Boja and Dutta, Dhanadeep and Pujari, P K (2008) Electron irradiation induced microstructural modifications in BaCl2 doped PVA: A positron annihilation study. Polymer Degradation and Stability, 93. ISSN 1554–1563

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Thin films of pure and 10 wt% BaCl2 doped poly(vinyl alcohol) (PVA) were prepared by solution casting method. These films were subjected to electron irradiation for different doses ranging from 0 to 400 kGy in air at room temperature. The effect of electron irradiation on the optical and free volume related microstructures of these polymer films was studied using positron annihilation lifetime spectroscopy, FTIR and UV–vis techniques. The FTIR spectral studies indicate that the electron irradiation induces chemical modifications within the doped PVA, which results in chain scission as well as cross-linking of the polymer. The positron lifetime study on these irradiated polymers shows that the chain scissions and cross-linking within the polymer matrix affect the free volume content and hence the microstructure. The UV–vis optical absorption studies show that the induced microstructural change by electron irradiation also modifies the optical properties. Using UV–vis spectra, the optical energy band gap was estimated and it decreases with increase in electron dose. A correlation between positron results and optical results is obtained and electron irradiation induced microstructure modifications within the doped polymer are understood. The results highlight the usefulness of positron annihilation technique in the study of the microstructure of irradiated polymers

Item Type: Article
Uncontrolled Keywords: Scission Cross-linking Electron beam irradiation Free volume UV–vis spectroscopy Positron annihilation spectroscopy
Subjects: Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 08 Feb 2014 11:05
Last Modified: 08 Feb 2014 11:05
URI: http://eprints.manipal.edu/id/eprint/138719

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