Influence of gamma irradiation on the formation of methanol induced micro-cracks in polycarbonate

Ramani, R. and Shariff, G. and Thimmegowda, M. C. and Sathyanarayana, P. M. and Ashalatha, M. B. and Balraj, A. and Ranganathaiah, C. (2003) Influence of gamma irradiation on the formation of methanol induced micro-cracks in polycarbonate. Journal of Materials Science, 38 (7). pp. 1431-1438. ISSN 1573-4803

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The effects of γ-irradiation on the methanol diffusion behaviour in polycarbonate have been investigated by UV-visible, Fourier Transform Infra-red (FTIR) Spectroscopy, Positron Annihilation Lifetime Spectroscopy (PALS), Differential Scanning Calorimetry (DSC), Sorption, and Optical Microscopy. Positron results show that the free volume size and its content decreases after γ-irradiation which is due to cross-linking of chains. The cross-linking process is further confirmed by DSC measurements, which indicate an increase in glass transition temperature (Tg) after γ-irradiation. Sorption results reveal that methanol diffuses faster in virgin polycarbonate as compared to cross-linked polycarbonate (after gamma irradiation) in agreement with the results of supplementary techniques. Interestingly, the optical microscopic examination of the sample surfaces provides clear evidence of decreased micro-crack formation in γ-irradiated polycarbonate as compared to the virgin sample. This decrease in crack formation can be related to the decrease in the rate of methanol diffusion.

Item Type: Article
Subjects: D Physical Science > Physics
Divisions: Department of > Physics
Depositing User: LA manjunath user
Date Deposited: 12 Sep 2019 05:48
Last Modified: 12 Sep 2019 05:48

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