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A possible “direct initiation” of cationic polymerization of isobutylene by boron trichloride in methylene chloride

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Summary

Initiation of the cationic polymerization of isobutylene by BCl3 requires a cocatalyst in most cases. However, we found conditions (θ=-30°C, CH2Cl2 as solvent, BCl3 ⩾ 0.0l m) where a direct initiation by BCl3 (i.e. with no cocatalyst) is possible. We showed that in such conditions HCl is not a cocatalyst and that H2O content is too low to explain the results (high vacuum and highly purified reactants and solvent).The conversion increases linearly with tine increasing concentration of BCl3.A mechanism is proposed.

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Authors and Affiliations

  1. Laboratoire de Synthèse Macromoléculaire (CNRS, UA 24), Université P. et M. Curie, 12 Rue Cuvier, F-75005, Paris, France

    L. Bul, H. A. Nguyen & E. Marechal

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  1. L. Bul
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  2. H. A. Nguyen
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  3. E. Marechal
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Bul, L., Nguyen, H.A. & Marechal, E. A possible “direct initiation” of cationic polymerization of isobutylene by boron trichloride in methylene chloride. Polymer Bulletin 17, 157–162 (1987). https://doi.org/10.1007/BF00256882

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