Quantitative Comparative Kinetics of 1-Hexene Polymerization across Group IV Bis-Phenolate Catalysts (original) (raw)

Kinetics of 1-hexene polymerization

Journal of Applied Polymer Science, 1986

Kinetics of 1-hexene polymerization was studied by following the amount of unreacted monomer using gas chromatography. The Ziegler-Natta catalyst system used was comprised of TiC1,-AlEt, with A1 : Ti ratio of 0.85. The sampling and monomer analysis techniques developed can be applied to study the kinetics of higher a-olefins polymerizations, in general. Also, with minor modifications in this technique, a precise profile of molecular weight can be obtained during polymerization.

Catalyst Deactivation Processes during 1-Hexene Polymerization

The catalyst [Cp 2 Zr(μ-Me) 2 AlMe 2 ] + [B(C 6 F 5 ) 4 ] − (1) has been studied by electrospray ionization mass spectrometry in order to better understand the complexities of catalyst deactivation in the polymerization of 1-hexene. Using off-line, online, and flow-based methods, we observe that zirconium π-allyl species are unstable in solution and previously unobserved dimethylalane complexes are more stable. The dimethylalane complexes are resistant to further 1-hexene additions, and their formation represents a previously unrecognized pathway for catalyst deactivation.