TY - JOUR
T1 - Synthesis and olefin polymerization using supported and non-supported geometry constrained titanium complexes
AU - Galan-Fereres, Mercedes
AU - Koch, Thomas
AU - Hey-Hawkins, Evamarie
AU - Eisen, Moris S.
N1 - Funding Information:
The research was supported by the German–Israel Foundation for scientific research and development (GIF) under grant agreement no. I-0437-142.05/95, by the Technion V.P.R. Fund Promotion of Sponsor Research and by the Loewegart Research Fund. M. Galan-Fereres thanks the Ministry of Education and Sciences of Spain for a postdoctoral fellowship.
PY - 1999/5/15
Y1 - 1999/5/15
N2 - The synthesis of a constrained geometry titanium complex and its immobilization on different supports have been studied for the catalytic polymerization of ethylene, propylene and styrene. The formation of higher molecular weight polymers was found in the heterogeneous system as compared to the homogenous parent for polyethylene and polypropylene. Polymerization of propylene yielded atactic products with elastomeric properties due to long polymer chains. However, syndiotactic polymers were formed in the polymerization of styrene. Catalytic activity was found to be dependent on MAO and titanium concentration; the higher the metal concentration the lower the activity of the catalyst. The activity of the heterogeneous system was determined as a function of time, and a first-order deactivation pathway was found at room temperature. The type of solvent (toluene or CH2Cl2) also played an important role in the polymerization of ethylene and styrene, although different tendencies were found for either monomers.
AB - The synthesis of a constrained geometry titanium complex and its immobilization on different supports have been studied for the catalytic polymerization of ethylene, propylene and styrene. The formation of higher molecular weight polymers was found in the heterogeneous system as compared to the homogenous parent for polyethylene and polypropylene. Polymerization of propylene yielded atactic products with elastomeric properties due to long polymer chains. However, syndiotactic polymers were formed in the polymerization of styrene. Catalytic activity was found to be dependent on MAO and titanium concentration; the higher the metal concentration the lower the activity of the catalyst. The activity of the heterogeneous system was determined as a function of time, and a first-order deactivation pathway was found at room temperature. The type of solvent (toluene or CH2Cl2) also played an important role in the polymerization of ethylene and styrene, although different tendencies were found for either monomers.
KW - Geometry constrained catalysts
KW - Heterogeneous Ziegler-Natta polymerization
KW - Homogeneous Ziegler-Natta polymerization
KW - Titanium complexes
KW - α-Olefin polymerization
UR - http://www.scopus.com/inward/record.url?scp=0001458681&partnerID=8YFLogxK
U2 - 10.1016/S0022-328X(98)01140-1
DO - 10.1016/S0022-328X(98)01140-1
M3 - 文章
AN - SCOPUS:0001458681
SN - 0022-328X
VL - 580
SP - 145
EP - 155
JO - Journal of Organometallic Chemistry
JF - Journal of Organometallic Chemistry
IS - 1
ER -