M. Wannaborworn and B. Jongsomjit and T. Shiono
Effect of Substituent on TitanoceneMMAO Catalyst for Ethylene1Hexene Copolymerization
816 - 818
2012
6
8
International Journal of Materials and Metallurgical Engineering
https://publications.waset.org/pdf/5365
https://publications.waset.org/vol/68
World Academy of Science, Engineering and Technology
Copolymerization of ethylene with 1hexene was
carried out using two ansafluorenyl titanium derivative complexes.
The substituent effect on the catalytic activity, monomer reactivity
ratio and polymer property was investigated. It was found that the
presence of tBu groups on fluorenyl ring exhibited remarkable
catalytic activity and produced polymer with high molecular weight.
However, these catalysts produce polymer with narrow molecular
weight distribution, indicating the characteristic of singlesite
metallocene catalyst. Based on 13C NMR, we can observe that
monomer reactivity ratio was affected by catalyst structure. The rH
values of complex 2 were lower than that of complex 1 which might
be result from the higher steric hindrance leading to a reduction of 1
hexene insertion step.
Open Science Index 68, 2012