Electron irradiation induced microstructural modifications in BaCl2 doped PVA

A positron annihilation study

A. Harisha, V. Ravindrachary, R. F. Bhajantri, Ismayil, Ganesh Sanjeev, Boja Poojary, Dhanadeep Dutta, P. K. Pujari

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1554-1563
Number of pages10
JournalPolymer Degradation and Stability
Volume93
Issue number8
DOIs
Publication statusPublished - 01-08-2008

Fingerprint

Positron annihilation
Electron irradiation
electron irradiation
positron annihilation
Polymers
polymers
Microstructure
Free volume
Positrons
microstructure
cleavage
positrons
Chemical modification
life (durability)
dosage
Polymer matrix
Polymer films
Band structure
Light absorption
Dosimetry

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Harisha, A. ; Ravindrachary, V. ; Bhajantri, R. F. ; Ismayil ; Sanjeev, Ganesh ; Poojary, Boja ; Dutta, Dhanadeep ; Pujari, P. K. / Electron irradiation induced microstructural modifications in BaCl2 doped PVA : A positron annihilation study. In: Polymer Degradation and Stability. 2008 ; Vol. 93, No. 8. pp. 1554-1563.
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Electron irradiation induced microstructural modifications in BaCl2 doped PVA : A positron annihilation study. / Harisha, A.; Ravindrachary, V.; Bhajantri, R. F.; Ismayil; Sanjeev, Ganesh; Poojary, Boja; Dutta, Dhanadeep; Pujari, P. K.

In: Polymer Degradation and Stability, Vol. 93, No. 8, 01.08.2008, p. 1554-1563.

Research output: Contribution to journalArticle

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T2 - A positron annihilation study

AU - Harisha, A.

AU - Ravindrachary, V.

AU - Bhajantri, R. F.

AU - Ismayil,

AU - Sanjeev, Ganesh

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AU - Dutta, Dhanadeep

AU - Pujari, P. K.

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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.

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