Scale-up precision synthesis of octa-arm polyisobutylene stars |
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Authors: | Jung S Shim J P Kennedy |
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Affiliation: | (1) Maurice Morton Institute of Polymer Science, University of Akron, Akron, OH 44325-3909, USA, US |
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Abstract: | Summary
This paper concerns the scale-up precision synthesis of octa-arm polyisobutylene (PIB) stars. Specifically, we have optimized
to the 100–200 g scale the preparation of star polymers consisting of eight PIB arms radiating from a calix8]arene core.
The synthesis strategy involved the use of a calix8]arene fitted with eight p-C(CH3)2OCH3 groups as the initiator in conjunction with mixed BCl3/TiCl4 coinitiators in hexanes/methyl chloride solvent systems at − 80 °C. Various possible side-reactions have been identified
and means for their suppression/elimination were developed.
Received: 29 December 1999/Revised version: 22 May 2000/Accepted: 22 May 2000 |
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