Thermal and photo-induced phenomena in $gamma$-irradiated poly(methyl methacrylate)

Journal Article · Tue Apr 01 04:00:00 EDT 1975 · J. Polymer Sci., Polym. Chem. Ed., v. 13, no. 4, pp. 797-805

DOI:https://doi.org/10.1002/pol.1975.170130403· OSTI ID:4068774

Torikai, A; Asai, T; Suzuki, T; Duri, Z I

ESR spectra and absorption spectra of $gamma$-irradiated poly(methyl methacrylate) (PMMA) at 77$sup 0$K and the photo- and thermal bleaching behavior have been studied. $gamma$-irradiation of PMMA yields a singlet spectrum with a line width of 6 G which is bleachable with visible light. This species is assigned to the polymer cation. The unbleached species consists mainly of a four- line spectrum and is assigned to a polymer radical having a different CH$sub 2$ conformation from the usual nine-line spectrum. On subsequent warming to room temperature, the spectrum changes into the nine-line spectrum. $gamma$- irradiation of PMMA containing biphenyl as an additive at 77$sup 0$K gives biphenyl cation. Yield of polymer radical is reduced by the addition of biphenyl and 2-methyltetrahydrofuran. A mechanism is proposed which is consistent with the experimental results. (auth)

• Research Organization: Univ. Chikusa-Ku, Nagoya, Japan
• Sponsoring Organization: USDOE
• NSA Number: NSA-33-022783
• OSTI ID: 4068774
• Journal Information: J. Polymer Sci., Polym. Chem. Ed., v. 13, no. 4, pp. 797-805, Journal Name: J. Polymer Sci., Polym. Chem. Ed., v. 13, no. 4, pp. 797-805; ISSN JPLCA
• Country of Publication: United States
• Language: English

Related Subjects

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CHEMICAL REACTION KINETICS
ELECTRON SPIN RESONANCE
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LOW TEMPERATURE
N40300* --Chemistry--Radiation Chemistry