Initial stage in radiation polymerization of hydroxyethyl methacrylate-water system at low temperatures |
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Authors: | M. Kumakura T. Fujimura I. Kaetsu |
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Affiliation: | Takasaki Radiation Chemistry Research Establishment, Japan Atomic Energy Research Institute Takasaki, Gunma, Japan |
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Abstract: | The initial stage in the radiation polymerization of the hydroxyethyl methacrylate water system at low temperatures was studied. The polymerization was accelerated by the presence of water; the effect increased with rising temperature above Tg. The polymerization rate had a maximum near ?50°. The initiating and propagating radicals were identified by studies with ESR. Irradiated hydroxyethyl methacrylate at low temperatures gave a 7-line spectrum, which was assigned to the initiating radical having equivalent protons. This spectrum was changed to a 9-line spectrum at ?120 to ?100°; it was assigned to the propagating radical. The temperature dependence of the ESR spectrum of irradiated hydroxyethyl methacrylate-water systems was studied to examine the effect of water on the propagating radical. |
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