Abstract.
The synthesis and characterization of a novel star comprising eight allyl-terminated polyisobutylene (PIB) arms radiating from a calix[8]arene core is described. The synthesis was accomplished by a core-first method, by inducing the living polymerization of isobutylene (IB) by a suitably functionalized calix[8]arene initiator (1) in conjunction with BCl3-TiCl4 coinitiators, and terminating the growth of the living PIB⊕ arms by allyltrimethylsilane. The relative concentrations of BCl3 and TiCl4 are critical for the synthesis of well-defined 8-arm stars. Characterization of the products (which included triple detector GPC studies and 1H NMR spectroscopy) indicated quantitative allylation. A mechanism which summarizes the experimental observations is proposed.
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Received: 17 July 1997/Revised version: 11 September 1997/Accepted: 19 September 1997
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Jacob, S., Majoros, I. & Kennedy, J. New polyisobutylene stars XI. Synthesis and characterization of allyl-telechelic octa-arm polyisobutylene stars. Polymer Bulletin 40, 127–134 (1998). https://doi.org/10.1007/s002890050233
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DOI: https://doi.org/10.1007/s002890050233