Polyolefin Synthesis by Metallocene Catalysts.
نویسندگان
چکیده
منابع مشابه
Metallocene Based Polyolefin Nanocomposites
One of the most efficient and versatile ways to synthesize polyolefin nanocomposites is the in-situ polymerization of olefins in the presence of nano particles by metallocene catalysts. Metallocene/methylaluminoxane (MAO) catalysts are soluble in hydrocarbons and therefore they can be absorbed perfectly in solution onto the surface of particles or fibers and after addition of ethene or propene ...
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50 years ago, Karl Ziegler and Giulio Natta were awarded the Nobel Prize for their discovery of the catalytic polymerization of ethylene and propylene using titanium compounds and aluminum-alkyls as co-catalysts. Polyolefins have grown to become one of the biggest of all produced polymers. New metallocene/methylaluminoxane (MAO) catalysts open the possibility to synthesize polymers with highly ...
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Binucleating multidentate amine bis(phenolate) ligands with rigid terphenyl backbones were designed to support two zirconium centers locked in close proximity. Polymerizations of propylene or 1-hexene with the synthesized bimetallic precatalysts resulted in polymers with significantly higher isotacticity (up to 79% mmmm) in comparison to the stereoirregular polymers produced with previously rep...
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Bis(2-R-ind)ZrCl2 (R: H or phenyl) was supported on different types of silica by in situ impregnation method and used for ethylene polymerization. In this method, the step of catalyst loading on support was eliminated and common alkyl aluminum (triisobutylaluminum, TiBA) cocatalyst was used instead of expensive methyl aluminiumoxane (MAO) cocatalyst in the polymerization. The effect of surface ...
متن کاملStructure Development from Simultaneous Phase Separation and Crystallization of Metallocene Polyolefin Blends
Introduction Olefin polymers are the most widely used materials in the plastics industry today. To optimize their properties and processibility, blending is often used. This is particularly important for the metallocene-catalyst based polyolefins. By altering certain shear-thinning and strain-hardening characteristics, blending can enhance the processibility of the material. This is in addition...
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ژورنال
عنوان ژورنال: Kobunshi
سال: 1993
ISSN: 0454-1138,2185-9825
DOI: 10.1295/kobunshi.42.907