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For example: S. Inoue and T. Aida, in “Ring-Opening Polymerization”, 2nd ed, K. J. Ivin, T. Saegusa, Ed., Elsevier Applied Science, London, 1984, vol. 1, pp 185–298.
E. J. Vandenberg, J. C. Mullis, and R. S. Juvet, Jr., J. Polym. Sci., Part A: Polym. Chem., 27, 3083 (1989).
E. J. Vandenberg, J. C. Mullis, R. S. Juvet, Jr., T. Miller, and R. A. Nieman, J. Polym. Sci., Part A: Polym. Chem., 27, 3113 (1989).
M. Bendnarek, T. Biedron, J. Helinski, K. Kaluzynski, P. Kubisa, and S. Penczek, Macromol. Rapid Commun., 20, 369 (1999).
H. Magnusson, E. Malmstrom, and A. Hult, Macromol. Rapid Commun., 20, 453 (1999).
H. Magnusson, E. Malmstrom, and A. Hult, Macromolecules, 34, 5786 (2001).
H. Magnusson, E. Malmstrom, A. Hult, and M. Johansson, Polymer, 43, 301 (2002).
D. Takeuchi, Y. Watanabe, T. Aida, and S. Inoue, Macromolecules, 28, 651 (1995).
For example: T. Nishikubo and A. Kameyama, Prog. Polym. Sci., 18, 963 (1993).
Spectroscopic data of poly(EHO) (Mn = 3120, Mw/Mn = 4.33, run 5 in Table I): 13C NMR (DMSO-d6, 125 MHz); δ = 7.60 (–CH3), 8.04 (–CH3, oxetane), 21.9 (–CH2CH3, terminal), 22.5 (–CH2CH3, linear), 23.0 (–CH2CH3, dendritic), 26.5 (–CH2CH3, oxetane), 40.0 (quaternary carbon, oxetane), 43.3 (quaternary carbon), 62.0 (–CH2OH, polymer end), 71.6 (–CH2O–), 73.4 (C–C–O, polymer end), 77.0 (C–O, oxetane) ppm.
The DB value was calculated by the following equations. DB(Fréchet) = (D + T)/(D + T + L) × 100 Where D, T, and L are the values of the integration ratios of dendritic, terminal, and linear repeating units measured by the 13C NMR spectroscopy. References: C. J. Hawker, R. Lee, and J. M. J. Fréchet, J. Am. Chem. Soc., 113, 4583 (1991).
DB (Frey) = 2D/(2D + L) × 100. References: D. Holter, A. P. Burgath, and H. Frey, Acta Polym. 48, 30 (1997).
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Kudo, H., Morita, A. & Nishikubo, T. Synthesis of a Hetero Telechelic Hyperbranched Polyether. Anionic Ring-Opening Polymerization of 3-Ethyl-3-(hydroxymethyl)oxetane Using Potassium tert-Butoxide as an Initiator. Polym J 35, 88–91 (2003). https://doi.org/10.1295/polymj.35.88
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DOI: https://doi.org/10.1295/polymj.35.88