By Francesco Ciardelli
Read or Download Structural Order in Polymers. Lectures Presented at the International Symposium on Macromolecules, Florence, Italy, 7–12 September 1980 PDF
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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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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.