By B Monakov; Z M Sabirov; N N Sigaeva
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Additional resources for Active sites of polymerization: multiplicity: stereospecific and kinetic heterogeneity
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Moreover, none of sufficient changes in the microstructure of synthesized polyisoprene were observed. 2). 2. HETEROGENEITY OF ACTIVE SITES IN IONICCOORDINATE POLYMERIZATION OF DIENES In 1954, catalytic systems for ionic-coordinate polymerization of unsaturated compounds were discovered by Carl Ziegler, and then polymerization of a-olefins and dienes with them was systematically studied by Julio Natta. These two events have provided for both synthesis of polymers, which may not be produced on other catalysts (for example, highmolecular propylene polymers and some higher a-olefins) and formation of macromolecules with highly regulated chain structure (1,4-cis- and 1,4-transpolydienes, iso- and syndiotactic polymers).
LO :r -;>,. "C 20 I 30 40 u. ~·o so 47 Active sites ofpolymerization. Multiplicity ... 6 Pcak4 :! 4 . - t. -------2 ----. 10. Kinetic activity dependence on piperylene conversion for the sites of polymerization, carried out on NdHah3TBP-Al(i-C4H9)3 catalytic system. Here Hal is chlorine (1) and bromine (2). B. N. N. Urazbaev Most likely, one of Ln-OCOR bonds may be preserved in the active sites of three-component systems derived from lanthanide carboxylates and, under definite conditions, provide for solubility of catalytic systems.