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ϵ‐caprolactone grafting on a poly(vinyl alcohol‐ co ‐vinyl acetate) in the melt without added initiator
Author(s) -
Becquart Frédéric,
Taha Mohamed,
Zerroukhi Amar,
Chalamet Yvan,
Kaczun Jürgen,
Llauro MarieFrance
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.26400
Subject(s) - polycaprolactone , vinyl alcohol , polymer chemistry , vinyl acetate , grafting , polymerization , ring opening polymerization , materials science , caprolactone , chemistry , copolymer , polymer , composite material
Polycaprolactone (PCL) grafting on vinyl alcohol‐ co ‐vinyl acetate) (PVA‐Ac), was investigated in the melt at high temperature (170°C), below the PVA‐Ac melting point, by ring opening polymerization of ϵ‐caprolactone initiated by metal alkoxyde sites present in PVA‐Ac: no additional initiator was used. The obtained average structures were determined by 1 H NMR. As expected, small grafts, with low average polymerization degree (DP), were obtained, between 4 and 12 h of reaction. These DP are due to exchange reactions between hydroxyl groups and PCL growing chains. The PVA‐Ac was shown to be partially substituted by short PCL grafts. The DP linearly increased with the initial Lactone/PVA‐Ac ratio, and the substituted alcohol sites rate were limited to 63%.It was shown that the used reactive system is characterized by a quazi‐living polymerization mechanism. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007