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- W2020093288 abstract "Anhydrous magnesium dichloride was reacted with silicon tetraethoxide to form a solid adduct. The adduct was treated with titanium tetrachloride and an internal Lewis base to prepare supported titanium catalysts. Alkyl benzoate (PhCOOR, R = Me, Et, n - Bu) or dialkyl phthalate [Ph(COOR)2, R = Me, Et, n - Bu] was used as an internal Lewis base. The prepared catalysts (MT) in combination with triethylaluminum as a cocatalyst polymerize propylene to yield polypropylene. The nature and concentration of internal Lewis base influence the composition, specific surface area, and performance of the catalysts. The addition of diphenyl dimethoxysilane into the MT/Et3Al catalyst system increases the isotactic index of polypropylene from 75 to 97 at a Si/Al mol ratio of 0.05. The overall results indicate that a dialkyl phthalate-incorporated catalyst shows better physical, chemical, and polymerization characteristics compared to a corresponding alkyl benzoate catalyst. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 64: 1445–1450, 1997" @default.
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- W2020093288 date "1997-05-16" @default.
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- W2020093288 title "Supported titanium catalysts based on magnesium dichloride?silicon tetraethoxide adduct for propylene polymerization" @default.
- W2020093288 doi "https://doi.org/10.1002/(sici)1097-4628(19970516)64:7<1445::aid-app24>3.0.co;2-u" @default.
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