Technical Aspects of Measurements of Propagating Radicals in Radical Polymerizations using Electron Spin Resonance （ESR） spectroscopy −Case 1: For the case of Steady-state ESR （SS ESR）−

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  • ラジカル重合研究のための電子スピン共鳴分光（ESR）スペクトル測定法─事例1：定常状態ESR（SS ESR）の場合─

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Electron Spin Resonance (ESR) spectroscopic studies directed at clarifying the fundamentals of radical polymerizations have been conducted. Optimization of measurement conditions allows direct detection of radicals in polymerization reactions and well-resolved ESR spectra can be obtained. The spectra provide information not only on the structure, properties, and concentration of radicals but also information on the initiating and propagating (oligomeric and polymeric) radicals in radical polymerizations. The key to the detection of well-resolved spectra in higher sensitivity, repeated optimization of the measurement conditions was essential. In this manuscript, we summarize a history of our efforts to obtain clear and well-resolved ESR spectra with commercially available spectrometer under repeated optimizations of various aspects of measurements. Interpretations of ESR spectra can clarify electronic structures of the radicals through analyses of hyperfine splitting constants.

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