Separation and characterization of ɛ-caprolactone oligomers by gel permeation chromatography

N. E. Manolova; I. Gitsov; R. S. Velichkova; I. B. Rashkov

doi:10.1007/BF00254664

Separation and characterization of ɛ-caprolactone oligomers by gel permeation chromatography

N. E. Manolova
, I. Gitsov
, R. S. Velichkova
, I. B. Rashkov

Chemistry

College of Environmental Science & Forestry

Bulgarian Academy of Sciences

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

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 e{open}-caprolactone. Oligomer mixtures of e{open}-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 e{open}-caprolactone polymerization by (C₆H₅)₃CSbCl₆ proceeds by alkyl-oxygen bond scission.

Original language	English
Pages (from-to)	285-291
Number of pages	7
Journal	Polymer Bulletin
Volume	13
Issue number	3
DOIs	https://doi.org/10.1007/BF00254664
State	Published - Mar 1985

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title = "Separation and characterization of ɛ-caprolactone oligomers by gel permeation chromatography",

abstract = "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 e\{open\}-caprolactone. Oligomer mixtures of e\{open\}-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 e\{open\}-caprolactone polymerization by (C6H5)3CSbCl6 proceeds by alkyl-oxygen bond scission.",

author = "Manolova, \{N. E.\} and I. Gitsov and Velichkova, \{R. S.\} and Rashkov, \{I. B.\}",

year = "1985",

month = mar,

doi = "10.1007/BF00254664",

language = "English",

volume = "13",

pages = "285--291",

journal = "Polymer Bulletin",

issn = "0170-0839",

publisher = "Springer Verlag",

number = "3",

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TY - JOUR

T1 - Separation and characterization of ɛ-caprolactone oligomers by gel permeation chromatography

AU - Manolova, N. E.

AU - Gitsov, I.

AU - Velichkova, R. S.

AU - Rashkov, I. B.

PY - 1985/3

Y1 - 1985/3

N2 - 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 e{open}-caprolactone. Oligomer mixtures of e{open}-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 e{open}-caprolactone polymerization by (C6H5)3CSbCl6 proceeds by alkyl-oxygen bond scission.

AB - 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 e{open}-caprolactone. Oligomer mixtures of e{open}-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 e{open}-caprolactone polymerization by (C6H5)3CSbCl6 proceeds by alkyl-oxygen bond scission.

UR - https://www.scopus.com/pages/publications/0022025119

U2 - 10.1007/BF00254664

DO - 10.1007/BF00254664

M3 - Article

SN - 0170-0839

VL - 13

SP - 285

EP - 291

JO - Polymer Bulletin

JF - Polymer Bulletin

IS - 3

ER -

Separation and characterization of ɛ-caprolactone oligomers by gel permeation chromatography

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