By B Monakov; Z M Sabirov; N N Sigaeva
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Extra info for Active sites of polymerization: multiplicity: stereospecific and kinetic heterogeneity
Example text
1 0, separately for each type of the sites. 8. MMD curves for polypiperylene synthesized on NdBr 33TBP-Al(iC4H9)3 catalytic system. B. N. N. • Ji I . 9. Distribution by kinetic heterogeneity of NdBr3 3TBP-Al(i-C4H9)3 catalytic system at polymerization of piperylene. 0% (6) Contrary to NdCb·3TBP-AI(i-C4H9h system, for the bromine-containing catalytic system the first type of the active sites responsible for formation of the most lowmolecular fraction of polydiencs is absent. The third type of active sites preserves kinetic activity during polymerization for both catalytic systems.
The authors believe that this indicates existence of high-activity sites decaying first and the sites incapable of high-rate polymerization. When TiCl 4 concentration is low, active sites are localized at the comers and on the faces of MgH 2 as the support. They are the sites, on which ethylene is polymerized. When TiCl4 concentration is high, structural changes reduce the quantity of highly active sites capable of copolymerization. Butadiene polymerization on lanthanide complexes applied on the polymer [poly(ethylene acrylic acid), poly(styrene acrylic acid)] was also studied [ 18].
1(2), p. 345. (Rus) Szwarc M. , 'The kinetics of propagation of anionic polymerization and copolymerization', In: Progress in Reaction Kinetics, Oxford: Pergamon Press, 1964. Zhaobin A. , STEPOL '94 Synth. Struct. Ind. Aspects Stereospec. Polym. Int. , 1994, Milano, p. 28. , Vysokomol. , vol. 22A(9), p. 2112. (Rus) D'Aprano A. , J Phys. , 1963, vol. 67, p. 1704. L. , J Phys. , 1964, vol. 68, p. 907. , JAm. Chern. , 1963, vol. 85, p. 304. Bufalini J. , J Am. Chern. , 1961, vol. 83, p. 4362. , Anal.