Results 181 to 190 of about 2,075 (218)
Some of the next articles are maybe not open access.
Ziegler-Natta catalysts for olefin polymerizations
Progress in Polymer Science, 1997Abstract This article reviews the recent developments of Ziegler-Natta and metallocene catalysts for olefin polymerizations. The roles of magnesium dichloride and electron donors on the activity and stereospecificity of Ziegler-Natta catalysts, as well as the roles of methylalumoxane and ligands on the activation and performance of metallocene ...
openaire +1 more source
Characterization of a model Ziegler–Natta catalyst for ethylene polymerization
The Journal of Chemical Physics, 2002Based on the work of the Somorjai group [Magni and Somorjai, Catal. Lett. 35, 205 (1995)] we have prepared a thin well ordered MgCl2(001) film by MgCl2 evaporation from a Knudsen cell. This film does not absorb TiCl4 at room temperature if it is not activated by increasing the defect density via electron or ion bombardment.
Schmidt, J. +3 more
openaire +2 more sources
Polymerization of vinylcyclohexane with ziegler–natta catalyst
Journal of Polymer Science Part A: Polymer Chemistry, 1992AbstractPolymerization of vinylcyclohexane (VCHA) with TiCl3–aluminum alkyl catalysts was investigated. The polymerization rate of VCHA was low due to the branch at the position adjacent to the reacting double bond. The effects of aluminum alkyl on the polymerization and monomer‐isomerization were observed; the polymer yield decreased in the following ...
Kiyoshi Endo, Takayuki Otsu
openaire +1 more source
Characterization of Ziegler–Natta catalyst by ESCA
Journal of Polymer Science: Polymer Physics Edition, 1981AbstractThe surface composition of TiCl3‐based Ziegler—Natta catalysts prepared by various methods was analyzed by ESCA to correlate the total amount of surface titanium with the catalyst activity in propylene polymerization. The ESCA peak ratio (Ti 2P3/2/Cl 2P) of the catalysts was measured to estimate the surface composition.
openaire +1 more source
Stereospecificity of Heterogeneous Ziegler-Natta Catalysts
1985The most prominent feature of heterogeneous Ziegler-Natta catalysts is their ability to produce isotactic olefin polymers exhibiting a combination of outstanding mechanical characteristics. This ability adds a new dimension to the description of the catalysts and the polymerization processes: the study of catalyst and polymerization parameters ...
openaire +1 more source