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Polymerization of anhydrous ethylenimine proceeds to completion with destruction of the terminal 1-aziridinyl group at relatively low molecular weight. In the absence of evidence for end groups, it is suggested that the chain terminating process is the formation of large rings composed of repeating CzHs N units. Information is given on the various intermediates present in the early stages of polymerization of ethylenimine and on analytical techniques for determining the degree of branching in polyethylenimine.
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Dick et al. (1970) studied this question.
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