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Extra resources for Structural Order in Polymers. Lectures Presented at the International Symposium on Macromolecules, Florence, Italy, 7–12 September 1980

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Sei·, 15 , 31-51 (1974). 17. A. Zambelli, in NMR Basic Principles and Progress, P. Diehl, E. Pluck and K. ), pp. 101-108, Springer-Verlag, Berlin, (1971). W. ), ρρ· 15-24, Acad. -San Francisco-London, (1975). 19· C· Wolfsgruber, G. Zannoni. E. Rigamonti and A. Zambelli, Macromol· Chem· 176, 2765-2769 (1975). 20. A· Zambelli, P. Locatelli, C. A. Boley, Macromolecules 11, 923-924 (1978). 21. P. l. M. Chirkov, Izv. Ail SSSR, ser. khim. 12, 1956-1964 (1964). 22. l. M. Chirkov, J» Polym. Sei· C16, 2659-2666 (1967).

The situation, however, is complicated by the fact that catalyst particles are disintegrated during polymerization by polymer formed. As a rule for these catalysts BET method is not applicable to measure the "working" surface. Correlation has been found between the activity and the surface of TiCl-. crystallites calculated according to their dimensions which were estimated by X-ray technique (Refs. 41, 52 & 53). Estimations based on the data on microstructure of catalyst particles (Ref. 54) show that "working" surface of 0-TiCl^ (with initial surface 11 m2/g) appears to reach 70-80 m /g as the result of catalyst disintegration.

Data on propagation rate constant (K ) and the number of propagation centers (C ) corresponding to the maximum observed polymerization rate (V ) of propylene on various samples of bulk (non-supported) TiCl^ as catalyst. 47 x10" a Polymerization at 70°C; data are given for the polypropylene insoluble in boiling n-heptane. ^Catalyst was prepared by reduction of TiCl, by H 2 · Catalyst was prepared by reduction of TiClJ by aluminium and dthen activated by dry grinding. "Solvay-type" catalyst, prepared by reduction of TiCl^ by AlEtpCl with further treatment by diisoamyl ether.

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