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The propagating radical in the emulsion polymerization reaction of butyl acrylate was detected by Electron Paramagnetic Resonance (EPR) spectroscopy using two spin‐trapping agents, 2‐methyl‐2‐nitrosopropane (MNP) and α‐(4‐pyridyl 1‐oxide)‐ N ‐tert‐butylnitrone (PyOBN). Through analysis of hyperfine structure of the spectra obtainedfrom the trapped radicals, the propagating radical is inferred to be the well known acrylate radical, [CH 2 CH(COOC 4 H 9 )] n CH 2 CH(COOC 4 H 9 ).
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Kim et al. (1994) studied this question.
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