By B Monakov; Z M Sabirov; N N Sigaeva
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Extra resources for Active sites of polymerization: multiplicity: stereospecific and kinetic heterogeneity
Urazbaev Butadiene polymerization in cyclohexane, carried out on NdCh3nL catalytic system (n = 3, L = 1-pentanol, 2-pentanol and 3-pentanol) and triethylaluminum as co-catalyst, was studied . The highest catalytic activity was displayed by the system with 2-pe:ntanol and then, in descending order, with 1-pentanol and 3-pentanol. The polymer yield increased with the catalyst and co-catalyst concentration, as well as with temperature. Hence, characteristic viscosity reduced in this case. Microstructure of polybutadiene formed was independent of the above-listed factors; the content of 1,4-cis-units exceeded 99%.
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. , 1954, vol. 26, p. 1696. , J Am. Chern. , 1954, vol. 76, p. 2597. , Carbanion Living Polymers and Electron Transfer Processes, New York, Interscience, 1978. B. N. N. Urazbaev 16 19. 20. 21. 22. 23. 24. J. , Can. J. , 1960, vol. 38, p. 196. F. , J. , 1959, vol. 35, p. 259. , Fortschr. Hochpolymer-Forsch (Advan. Polymer. ), 1965, Bd. 4, S. 66. , Principles of Polymerization, McGRAW-Hill Book Company, New York, 1973.
1. Experimental sedimentation diagrams of isoprene - TiC1 4-Al(i-C 4 H9)3 ~ hexane living polymerization system: a~ before deactivation; b - after deactivation. Polymer concentration in the solution equals 2 mg/ml; rotor speed is 42,040 rot/min; monomer:catalyst ratio is 15; n is the refraction index of the solution; r is the distance from the rotation axis. 1- small polymer-catalyst particles; 2- free macromolecules; SV- Svedberg units  Active sites ofpolymerization. Multiplicity 23 Similar diagram was also followed  in the investigations of the catalyst dispersion effect on the polymerization rate.
Active sites of polymerization: multiplicity: stereospecific and kinetic heterogeneity by B Monakov; Z M Sabirov; N N Sigaeva