On the free radicals produced in γ-irradiated polyacrylamide
作者:
N.Subba Rami Reddy,
Y.Sudarshana Reddy,
B.Sanjeeva Rao,
期刊:
Radiation Effects and Defects in Solids
(Taylor Available online 1994)
卷期:
Volume 129,
issue 3-4
页码: 273-278
ISSN:1042-0150
年代: 1994
DOI:10.1080/10420159408229026
出版商: Taylor & Francis Group
关键词: free radicals;γ-irradiation;polyacrylamide;ESR
数据来源: Taylor
摘要:
Nature of free radicals produced on γ-irradiation of polyacrylamide (PAAm) have been investigated by electron spin resonance (ESR) spectroscopy. The ESR spectrum observed for irradiated PAAm at room temperature (RT) is a triplet with hyperfine (hf) splittings of 24 G and intensity distribution of 1:3:1. Superposition of component triplet, together with a singlet originating from a different radical is found to be the best fit to the experimental spectrum at RT, as has been deduced from the total curve fitting method. The ESR spectrum of irradiated PAAm at liquid nitrogen temperature (LNT) is a sharp singlet. The spectra at RT and LNT are attributed to different interconvertible forms of the free radicals of the type ∼CH2-C(CONH2)-CH2-. A mechanism for radiative degradation of PAAm is proposed.
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