Summary
It is shown that the combined use of gel permeation chromatography and the isocyanate method of determination of hydroxyl end groups extends the possibilities for studying complex oligomer mixtures of ɛ-caprolactone. Oligomer mixtures of ɛ-caprolactone obtained by (C6H5)3CSbCl6 and by (C6H5)3CK are investigated. At initiation by both the initiators — the cationic and the anionic one — a covalent bond between the initiator and the polymer chain is formed. In the case of the initiation by (C6H5)3CK intramolecular transesterification proceeds which results in cyclic oligomers. At initiation by (C6H5)3CSbCl6 linear oligomers are formed. It is assumed that the ɛ-caprolactone polymerization by (C6H5)3CSbCl6 proceeds by alkyl-oxygen bond scission.
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References
Houben-Weyl, “Methods of the Organic Chemistry”, Moscow, 1963, vol.2, p.322.
F.H.Otey, B.L.Zagoren, C.L.Mehltretter, J.Appl.Polym.Sci. 8, 1985 (1964).
A.K.Bose, P.R.Srinivasan, Tetrahedron 31, 3025 (1975).
W.M.Pasika, J.Polym.Sci. A3, 4287 (1965).
R.Levine, E.Baumgarten, G.R.Hauser, J.Amer.Chem.Soc. 66, 1230 (1944).
I.B.Rashkov, I.Gitsov, I.M.Panayotov, J.-P.Pascault, J.Polym.Sci., Polym.Chem.Ed. 21, 923 (1983).
I.B.Rashkov, I.Gitsov, to be publ.
K.Ito, Y.Hashizuka, Y.Yamashita, Macromolecules 10, 821 (1977).
N.E.Manolova, I.B.Rashkov, R.S.Velichkova, I.M.Panayotov, Eur. Polym.J. 20, 463 (1984).
A.Hofman, R.Szymanski, S.Siomkowski, S.Penczek, Makromol. Chem. 185, 655 (1984).
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Manolova, N.E., Gitsov, I., Velichkova, R.S. et al. Separation and characterization of ɛ-caprolactone oligomers by gel permeation chromatography. Polymer Bulletin 13, 285–291 (1985). https://doi.org/10.1007/BF00254664
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DOI: https://doi.org/10.1007/BF00254664