Abstract
Thermal and photo-induced reactions of radical species generated by γ-irradiation of poly(methyl methacrylate) and poly(ethyl methacrylate) have been investigated by means of ESR spectroscopy. The γ-irradiation at cryogenic temperature leads to the formation of three major radical species, side chain –COOCnH2n+1·− anion radicals and –COOĊHCn−1H2n−1 radicals, and main chain –ĊH– radicals. Cation radicals are immediately converted to the neutral radicals by proton transfer to the polymer molecules. Illumination of the polymer anion radicals with visible light leads to electron detachment or the elimination of ester alkyl groups to form alkyl radicals. Illumination with UV light leads to the conversion of the –COOĊHCn−1H2n−1 radicals to acyl-type –Ċ=O radicals. Both the –COOĊHCn−1H2n−1 and the –Ċ=O radicals are the precursor of scission-type ·C(CH3)(COOCnH2n+1)CH2- radicals.
Similar content being viewed by others
Log in or create a free account to read this content
Gain free access to this article, as well as selected content from this journal and more on nature.com
or
References
M. Iwasaki and Y. Sakai, J. Polym. Sci., A-1, 1537 (1969).
V. Deniz, O. Güven, and T. Ozbey, Radiat. Phys. Chem., 26, 33 (1985).
V. Deniz, O. Güven, and T. Ozbey, Radiat. Phys. Chem., 26, 39 (1985).
G. Geuskens, D. Fuld, and C. David, Makromol. Chem., 160, 135 (1972).
A. Torikai, T. Asai, T. Suzuki, and Z. Kuri, J. Polym. Sci., Polym. Chem. Ed., 13, 797 (1975).
A. Torikai, H. Kato, and Z. Kuri, J. Polym. Sci., Polym. Chem. Ed., 14, 1065 (1976).
A. Torikai and R. Kato, J. Polym. Sci., Polym. Chem. Ed., 16, 1487 (1978).
A. Torikai and S. Okamoto, J. Polym. Sci., Polym. Chem. Ed., 16, 2689 (1978).
A. Torikai and H. Mishina, J. Polym. Sci., Polym. Chem. Ed., 19, 2297 (1981).
M. Tabata, G. Nilsson, and A. Lund, J. Polym. Sci., Polym. Chem. Ed., 21, 3257 (1983).
M. Ogasawara, M. Tanaka, and H. Yoshida, J. Phys. Chem., 91, 937 (1987).
T. Ichikawa and H. Yoshida, J. Polym. Sci., Polym. Chem. Ed., 28, 1185 (1990).
R. L. Huddson and F. Williams, J. Phys. Chem., 82, 967 (1978).
J. E. Bennet and B. Mile, J. Chem. Soc., Faraday Trans. 1, 67, 1587 (1971).
Y. Nakajima, S. Sato, and S. Shida, Bull. Chem. Soc. Jpn., 42, 2132 (1969).
W. Burlandt, D. Green, and C. Taylor, J. Appl. Polym. Sci., 1, 296 (1959).
A. Todd, J. Polym. Sci., 42, 223 (1960).
P. B. Ayscough and J. P. Oversby, J. Chem. Faraday Trans. 1, 68, 1153 (1972).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Tanaka, M., Yoshida, H. & Ichikawa, T. Thermal and Photo-Induced Reactions of Polymer Radicals in γ-Irradiated Poly(alkyl methacrylate). Polym J 22, 835–841 (1990). https://doi.org/10.1295/polymj.22.835
Issue date:
DOI: https://doi.org/10.1295/polymj.22.835
