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Determination of the Catalytic Sites for Ziegler-Natta Homo-Polymerization from GPC Data

โœ Scribed by Sridhar V. Maddipati; W. Nicholas Delgass; James M. Caruthers

Book ID
102943344
Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
660 KB
Volume
20
Category
Article
ISSN
1022-1344

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โœฆ Synopsis

Abstract

Deconvolution of the MWD of a polymer produced by multiโ€site catalysts into independent Flory modes is the first step in modeling the polymerization process. A new deconvolution procedure for GPC data is developed that does not require an a priori assumption concerning the nature of the discrete distribution and can be used with a continuous distribution. The MWD measured via GPC is a linear function of the individual catalytic sites, but it is numerically illโ€conditioned, preventing direct inversion of the GPC data. Tikhonov regularization has been developed to uniquely invert the MWD. Applying the regularizing method to a polyethylene produced via a Zieglerโ€Natta catalyst, seven discrete sites were found, and the kinetic constant ratios were determined for each of these sites.
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๐Ÿ“œ SIMILAR VOLUMES

Analysis of models for the Ziegler-Natta
Analysis of models for the Ziegler-Natta stereospecific polymerization on the basis of non-bonded interactions at the catalytic siteโ€”I. The Cossee model
โœ P. Corradini; V. Barone; R. Fusco; G. Guerra ๐Ÿ“‚ Article ๐Ÿ“… 1979 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 658 KB

Abstrmct--The model proposed by Cossee for Ziegler-Natta polymerization of propene is re-examined by computing the non-bonded energies for all sets of possible internal coordinates of the atoms at the catalytic site. For catalytic sites in the bulk of ( 110) surfaces of TiCI3-~, it is possible to ex