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 calix[8]arene core. The synthesis strategy involved the use of a calix[8]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.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Received: 29 December 1999/Revised version: 22 May 2000/Accepted: 22 May 2000
Rights and permissions
About this article
Cite this article
Shim, J., Kennedy, J. Scale-up precision synthesis of octa-arm polyisobutylene stars. Polymer Bulletin 44, 493–499 (2000). https://doi.org/10.1007/s002890070070
Issue Date:
DOI: https://doi.org/10.1007/s002890070070