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Chain-extending of Hydroxytelechelic Polybutadiene: Synthesis and Characterization
Authors:Michaël Lemoine  Claire-Helene Brachais  Gilles Boni  Laurent Brachais  Jean-Pierre Couvercelle
Affiliation:1. Institut de Chimie Moléculaire de l’Université de Bourgogne , Systèmes Hybrides Multifonctionnels, Université de Bourgogne , UFR Sciences et Techniques, Dijon, France;2. EMMA, AgroSup , Université de Bourgogne , esplanade Erasme, Dijon, France
Abstract:Extension of hydroxytelechelic polybutadiene oligomers ( /></span> 3200 g/mol) is performed in mild conditions, in order to avoid backbone modifications, using succinic anhydride or methylenedicyclohexyl diisocyanate. The two routes present significative extension of the initial oligomers. Extension through the anhydride route, in the presence of DCC and DMAP, leads to new hydroxytelechelic oligomers (<span class= /></span> 8000 g/mol). Extension through the diisocyanate route, catalyzed by DBTL at 65°C leads to hydroxytelechelic oligomers of higher average molecular weight (<span class= /></span> 20000 g/mol). New materials are characterized by FTIR/<sup>1</sup>H-NMR and changes in their Tg according to <span class= /></span>, are discussed. The influence of reaction time on the length of the macromolecular chains is also studied.</td> </tr> <tr> <td align=
Keywords:HTPB  chain-extented  HMDI  succinic anhydride  glass transition temperature
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