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- W1976955222 abstract "Extensive dry ball milling of layer-lattice type TiCl3 and TiCl3 · xAlCl3 polymerization catalyst components results in a drastic and surprising increase in catalyst activity. The particle size does not change very much during the milling and influences only the initial buildup of activity in propylene polymerizations. By contrast, the crystallite size, as calculated from the broadening of X-ray diffraction peaks representing directions parallel and transverse to the hexagonal crystal axis, undergoes extensive reduction far beyond what would normally be expected from such a treatment. This size reduction appears to be a function of the particular crystal structure of these materials which makes Cl-M-Cl double layer sliding possible when the intensity of shear is sufficiently high. As a consequence, the crystallite size reduction will always be accompanied by a change in crystal structure from the α- or γ-form to the δ-form which is characterized by disordered stacking of the double layers. For a given catalyst preparation, the activity increases with decreasing crystallite size until a minimum average size has been reached, corresponding to a value of about 50 Å for both directions measured. Further reduction in crystallite size results in a less active catalyst, probably because of a tendency of such small crystallites to change to the less active β-form." @default.
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- W1976955222 date "1973-03-01" @default.
- W1976955222 modified "2023-10-14" @default.
- W1976955222 title "Dependence of polymerization activity on particle and crystallite dimensions in ball milled TiCl3 and TiCl3 a 0.33AlCl3 catalyst components" @default.
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- W1976955222 doi "https://doi.org/10.1016/0021-9517(73)90128-0" @default.
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