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

被引:13
作者
Becquart, Frederic
Taha, Mohamed
Zerroukhi, Amar
Chalamet, Yvan
Kaczun, Juergen
Llauro, Marie-France
机构
[1] Univ St Etienne, Fac Sci, CNRS, UMR 5156,Lab Rheol Mat Plast, F-42023 St Etienne 2, France
[2] BASF AG, D-6700 Ludwigshafen, Germany
[3] CNRS, FR 2151, Serv RMN Federat Polymeristes Lyonnais, F-69390 Vernaison, France
关键词
PVA; epsilon-caprolactone; graft copolymers; anionic polymerization; living polymerization; NMR;
D O I
10.1002/app.26400
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Polycaprolactone (PCL) grafting on vinyl alcoliol-co-vinyl acetate) (PVA-Ac), was investigated in the melt at high temperature (170 degrees C), below the PVA-Ac melting point, by ring opening polymerization of epsilon-caprolactone initiated by metal alkoxyde sites present in PVA-Ac: no additional initiator was used. The obtained average structures were determined by H-1 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. (c) 2007 Wiley Periodicals, Inc.
引用
收藏
页码:2525 / 2531
页数:7
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