Microstructural characterization of poly1-hexene and new copolymer of 1-hexene/5-hexene-1-ol prepared by Cp2ZrCl2 /MAO catalytic system

1-hexene homopolymerization and 1-hexene/5-hexene-1-ol copolymerization were conducted using metallocene, Cp2ZrCl2, catalyst with methylaluminoxane (MAO) as activating agent. IR and 13C-NMR analyses of the resulting (co)polymers was done to confirming incorporation of functional monomer to the poly1-hexene backbone.13C-and 1H-NMR analyses were carried out to identify the tacticity and termination reaction mechanisms of (co)polymerization and study unsaturated structures of the (co)polymers. Our results showed that this catalytic system produces homopolymer chains with, vinylidene (CH2=CRR', Vd, resulted from 1,2-inserted chain-end) end structure and with 74 % isotacticity; while that in the copolymer both Vd (resulted from 1,2-inserted mechanism, 70 %) and di-substituted vinylene (2Vn, resulted from 2,1-inserted mechanism, 30 %) chain ends have been seen.

کلیدواژه ها:

Metallocene catalyst ، 1-hexene ، 5-hexene-1-ol ، copolymerization ، polyolefin