Synthesis of linear and three-arm star tert-chlorine-telechelic polyisobutylenes by a two-step conventional laboratory process
✍ Scribed by Jesper Feldthusen; Béla Iván; Axel H. E. Müller; Jørgen Kops
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 432 KB
- Volume
- 18
- Category
- Article
- ISSN
- 1022-1336
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✦ Synopsis
Abstract
A two‐step conventional laboratory process was developed for the synthesis of mono‐ and difunctional linear and three‐arm star tert‐chlorine‐telechelic polyisobutylenes (PIB) with desired molecular weights (MW) and narrow molecular weight distribution (MWD) by living carbocationic polymerization (LCCP). This polymerization method applies easy to handle operations and chemicals. LCCP of isobutylene (IB), was carried out in CH~2~Cl~2~ as solvent and with BCl~3~ as coinitiator in the first step to obtain soluble low MW PIB prepolymer with narrow MWD. This was followed by addition of hexane, TiCl~4~ and additional monomer in the second step to prepare PIBs with desired MW and narrow MWD in practically any suitable MW region. Comparison of the one‐step and two‐step processes is also described.