Carbocationic Polymerization in the Presence of Sterically Hindered Bases. IX. High Efficiency Blocking of Poly(α-methylstyrene) from Linear and Radial Polyisobutylenes Carrying tert-Chlorine Termini in the Presence of Proton Traps
- 1 July 1982
- journal article
- research article
- Published by Informa UK Limited in Journal of Macromolecular Science: Part A - Chemistry
- Vol. 18 (1), 119-128
- https://doi.org/10.1080/00222338208056662
Abstract
Di-, tri-, and tristar block copolymers consisting of rubbery poly(isobutylene) (PIB) and glassy poly(α-methylstyrene) (PαMeSt) sequences have been synthesized with 70 to > 95% efficiency. The syntheses involved initiation of α-methylstyrene polymerization by linear or three-arm star PIB's carrying 1,2, or 3 tertiary chlorine termini in conjunction with SnCl4 coinitiator in the presence of 2,6-di-tert-butylpyridine (DtBP). Blocking efficiencies (B eff.) increased with the amount of DtBP and approached 100% under suitable conditions.Keywords
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