MgC12 supported Ti and Hf catalysts were comparatively tested with respect to the polymerization of differently shaped monoalkenes. The ratio between the average polymerization rates of Ti and Hf catalysts during the first 120 rain ( V~i/Vpn f) is 10 for ethylene,i ncreases to 63 for propylene and returns to ~ 12-20 for higher or bulkier monoalkenes, suggesting a distinct shape selectivity of active sites
Посилання на статтю:
Distinct behaviour of Ti and Hf supported catalysts in the polymerization of different monoalkenes / Angelina Altomare, Roberto Solaro and Francesco Ciardelli* // Polymer. – 1992. – Vol 33. – P. 1768-1770.