TY - JOUR
T1 - Electron irradiation induced microstructural modifications in BaCl2 doped PVA
T2 - A positron annihilation study
AU - Harisha, A.
AU - Ravindrachary, V.
AU - Bhajantri, R. F.
AU - Ismayil,
AU - Sanjeev, Ganesh
AU - Poojary, Boja
AU - Dutta, Dhanadeep
AU - Pujari, P. K.
PY - 2008/8/1
Y1 - 2008/8/1
N2 - 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.
AB - 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.
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U2 - 10.1016/j.polymdegradstab.2008.05.003
DO - 10.1016/j.polymdegradstab.2008.05.003
M3 - Article
AN - SCOPUS:48549086297
SN - 0141-3910
VL - 93
SP - 1554
EP - 1563
JO - Polymer Degradation and Stability
JF - Polymer Degradation and Stability
IS - 8
ER -