ϵ-caprolactone grafting on a poly(vinyl alcohol-co-vinyl acetate) in the melt without added initiator

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 use...

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Published in:Journal of applied polymer science 2007-09, Vol.105 (5), p.2525-2531
Main Authors: Becquart, Frédéric, Taha, Mohamed, Zerroukhi, Amar, Chalamet, Yvan, Kaczun, Jürgen, Llauro, Marie-France
Format: Article
Language:English
Subjects:
anionic polymerization
Applied sciences
Copolymerization
Exact sciences and technology
graft copolymers
living polymerization
NMR
Organic polymers
Physicochemistry of polymers
Preparation, kinetics, thermodynamics, mechanism and catalysts
PVA
ϵ-caprolactone
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Summary: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 1H 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
ISSN:0021-8995
1097-4628
DOI:10.1002/app.26400