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End group analysis by NMR spectroscopy and by various chemical methods as well as dipole moments of the carefully purified polymer obtained from propiolactone or pivalolactone and trimethylamine prove the following zwitterion structure: magnified image Theoretical aspects of chain initiation with formation of zwitterions are discussed and some physical properties of macrozwitterions are investigated.
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Jaacks et al. (1970) studied this question.
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