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.

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The effects of gamma-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 gamma-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 (T-g) after gamma-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 gamma-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. (C) 2003 Kluwer Academic Publishers.

Item Type: Article
Subjects: Physical Sciences > Physics
Divisions: Constituent Colleges > Yuvaraja's College Mysore > Physics
Depositing User: Users 11 not found.
Date Deposited: 12 Apr 2013 05:51
Last Modified: 09 May 2013 07:47

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