Titlebook: History of Polyolefins; The World’s Most Wid Raymond B. Seymour,Tai Cheng Book 1986 Springer Science+Business Media Dordrecht 1986 catalysi

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Optically Active Polyolefins,propylene, each monomeric unit contains an asymmetric carbon atom and then in principle the possibility exists of obtaining optically active polymers. However atactic and syndiotactic macromolecules can be considered non dissymmetric because of substantial intramolecular compensation inherent to their molecular structure(1).

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Catalysis and the Polyethylene Revolution,xtremely high pressures and temperatures characteristic of the conventional processes for making low-density polyethylenes. The scientific community and industrial organizations around the world have recognized Union Carbide’s gas-phase, UNIPOL process, as a major technological accomplishment.[2]

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The Role of Mgcl2 on the Activity of Olefin Polymerization, the polymerization of ethylene with the use of soluble chromium-based catalytic systems. From these results combined with the XPS spectra of Cl(2p) in MCl. and of Ti(2p) in TiCl./MCl., a plausible mechanism was proposed for the enhancement of the activity by using MgCl..

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History of Helical Structures in Vinyl Polymers,rsional angles defining this rotational isomeric state are repeated regularly along the polymer chain. This leads to a helical conformation which is generally the same as found in the crystalline polymer. X-ray diffraction has been the single most useful experimental tool for providing data concerning this “crystalline” minimum energy state.

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,The Development of High Activity Catalysts in α-Olefin Polymerization,alues in excess of 1,000 kg/gTi within a comparatively short period of time. This dramatic increase in catalyst activity has been made possible by a number of contributing discoveries, some of which go back to the early days soon after Ziegler’s original discovery.

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