TY - JOUR ID - 1145 TI - Study of Ziegler-Natta/(2-PhInd)2ZrCl2 hybrid catalysts performance in slurry propylene polymerization JO - Polyolefins Journal JA - POJ LA - en SN - 2322-2212 AU - Nejabat, Gholam-Reza AU - Nekoomanesh, Mehdi AU - Arabi, Hassan AU - Salehi-Mobarakeh, Hamid AU - Zohuri, Gholam-Hossein AU - Mortazavi, Mohammad-Mahdi AU - Ahmadjo, Saeid AU - Miller, Stephen A. AD - Department of Polymer engineering, School of Chemical and Material Engineering, Islamic Azad University (Shiraz Branch), P.O. Box. 71993-3, Shiraz, Iran AD - Polymerization Engineering Department, Iran Polymer and Petrochemical Institute (IPPI), P.O. Box 14965/115, Tehran, Iran AD - Petrochemical Department, Iran Polymer and Petrochemical Institute (IPPI), P.O. Box 14965/115, Tehran, Iran AD - Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, P.O. Box 1436, Mashhad, Iran AD - Catalyst Department, Iran Polymer and Petrochemical Institute (IPPI), P.O. Box 14965/115, Tehran, Iran AD - The George and Josephine Butler Polymer Research Laboratory, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, USA Y1 - 2015 PY - 2015 VL - 2 IS - 2 SP - 73 EP - 87 KW - Hybrid catalysts KW - Ziegler-Natta KW - metallocene KW - Surface and bulk analysis KW - Polypropylene DO - 10.22063/poj.2015.1145 N2 - Several types of hybrid catalysts are made through mixing of 4th generation Ziegler-Natta (ZN) and (2-PhInd)2ZrCl2  metallocene catalysts using triethylaluminum (TEA) as coupling agent. Response surface methodology (RSM) is used to evaluate the interactive effects of different parameters including amounts of metallocene and TEA and temperature on metallocene loading. Analyzing the amounts of Al and Zr elements in the hybrid catalysts through ICP-OES and EDXA reveals that temperature plays a crucial role on anchoring of the metallocene catalyst on ZN while TEA has the least determining effect. The ICP analysis shows that as the concentration of Al goes up in the hybrid catalyst the concentration of Zr passes a maximum, while EDXA shows a direct relationship between the Al and Zr contents. Using triisobutylaluminum (TIBA) and methylaluminoxane (MAO) as the coupling agents, almost similar metallocene loadings are observed. Finally, the performance of hybrid catalysts is investigated in propylene polymerization and the obtained polymers are characterized using DSC and DMTA through which the presence of two types of polymers in the final product are confirmed. UR - http://poj.ippi.ac.ir/article_1145.html L1 - http://poj.ippi.ac.ir/article_1145_37a49082a2bc170a27aa700414df433d.pdf ER -