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SYNOPSISThe isoselective propene polymerization using the supported catalyst SiO 2 /MAO/ Me 2 Si(2-Me-Benz[e]Ind) 2 ZrCl 2 /AlR 3 was investigated and compared with propene polymerization using the corresponding homogeneous catalyst system. The influence of propene concentration, polymerization medium, temperature, comonomer, and external aluminium alkyls on polymerization kinetics and polypropene properties such as molecular mass, stereo-and regioselectivity, morphology, and bulk density was studied.

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Calcium sulfate is an important mineral present in a wide variety of natural and engineered environments. Three phases (gypsum, bassanite, and anhydrite), differing in their degree of hydration, can occur...