Propene homo‐ and copolymerization using homogeneous and supported metallocene catalysts based on Me2Si(2‐Me‐Benz[e]Lnd)2ZrCl2

Abstract

SYNOPSISThe isoselective propene polymerization using the supported catalyst SiO 2 /MAO/ Me 2 Si(2-Me-Benz[e]Ind) 2 ZrCl 2 /AlR 3 was investigated and compared with propene polymerization using the corresponding homogeneous catalyst system. The influence of propene concentration, polymerization medium, temperature, comonomer, and external aluminium alkyls on polymerization kinetics and polypropene properties such as molecular mass, stereo-and regioselectivity, morphology, and bulk density was studied.

Ethylene/1-Hexene Copolymerization over Different Phases Titania-Supported Zirconocene Catalysts

“…The inorganic carriers such as silica [9][10][11], alumina [12], magnesium chloride [13] and titania [14][15][16] are commonly employed for both ethylene homo-and copolymerization. The type of used support has an important influence on the polymer properties such as morphology, particle size and molecular weight.…”

Thermal Behavior, Structure and Morphology of Propene/Higher 1-Olefin Copolymers

“…[3][4][5][6] These copolymers seem to be very promising materials due to some interesting characteristics, such as outstanding gloss and clarity combined with good mechanical properties. Despite the renewed interest in novel propene copolymers, [7][8][9][10][11][12][13][14][15][16][17][18] favored by the development of new stereorigid bridged metallocene catalysts [19,20] which allow precise control of microstructural features, only few data concerning the effect of the 1-olefin co-unit on the properties of the resultant copolymers are available. [11,13,[15][16][17][18] In particular, to our knowledge, results aimed at investigating the effect of even and odd C numbered comonomers, in the range from C4 up to C8, have not yet been published.…”

Metallocenic Copolymers of Isotactic Propylene and 1‐Octadecene: Crystalline Structure and Mechanical Behavior

“…changing only the structure of the catalyst. [6,7] Moreover, metallocene catalysts can produce improved copolymer systems, in particular with large olefins [8][9][10][11] (1-hexene, 1-octene, etc. ), due to the possibility of having a very narrow and homogeneous comonomer distribution along the chains of the polymer, and allowing the control of percentage of incorporation, maintaining the low polydispersity.…”

“…[8][9][10][11] In particular, it was found that the incorporation of these large comonomers lead to changes in the morphology, the density and the crystallinity of the polymeric material, depending mainly on the degree of comonomer incorporation. [13] Therefore, it was possible to obtain tailor-made polymers with specific properties.…”