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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
0 Peak 2 Peak I . ,d. 6 . 2 02' 10 20 30 40 c. 10 a. , 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.
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. s in chlorine-containing system is also invariable during polymerization, whereas for NdBr 3 ·3TBP-Al(i-C 4H9)3 system it is significantly reduced.
Collect. Czech. Chern. , 1993, vol. 58(10), p. 2349. , Zh. Prikl. , 1986, vol. 59(1), p. 227. , Acta Polymerica, 1983, vol. 34(11/12), p. 667. Chapter 2. 1. HETEROGENEITY OF ACTIVE SITES IN HETEROGENEOUS POLYMERIZATION PROCESSES Similar to other chemical reactions, polymerization processes may be performed in both homogeneous and heterogeneous systems. There are different reasons for heterogeneity. For example, in the case of radical polymerization, a polymer or an initiator can be insoluble in the polymerization mixture or rather complex insoluble catalytic systems participate m ionic-coordinate polymerization processes.
Active sites of polymerization: multiplicity: stereospecific and kinetic heterogeneity by B Monakov; Z M Sabirov; N N Sigaeva