Synthesis and properties of poly-1-olefins

Abstract

The oligomerization and polymerization of 1-pentene using Cp2ZrCl2, Cp2HfCl2, [(CH3)5C5]2ZrCl2, rac-[C2H4(Ind)2]ZrCl2, [(CH3)2Si(Ind)2]ZrCl2, (CH3)2Si(2-methylbenz[e]indenyl)2ZrCl2, Cp2ZrCl{O(Me)CW(CO)5}, Cp2ZrCl(OMe) and methylaluminoxane (MAO) has been studied. The degree of polymerization was highly dependent on the metallocene catalyst. Oligomers ranging from the dimer of 1-pentene to polymers of poly-1-pentene with a molar mass Mw = 149000 g/mol were formed. Cp2ZrCl{O(Me)CW(CO)5} is a new highly active catalyst for the oligomerization of 1-pentene to low molecular weight products. The activity decreases in the order Cp2ZrCl{O(Me)CW(CO)5} > Cp2ZrCl2 > Cp2ZrCl(OMe). Furthermore, poly-1-olefins ranging from poly-1-pentene to poly-1-octadecene were synthesized with (CH3)2Si(2-methyl-benz[e]indenyl)2ZrCl2 and methylaluminoxane (MAO) at different temperatures. The temperature dependence of the molar mass can be described by a common exponential decay function irrespective of the investigated monomer.