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By George M. Benedikt

  • ''...a very useful e-book on plastic foams...'' - Polymer News

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By George M. Benedikt

  • ''...a very useful e-book on plastic foams...'' - Polymer News

Show description

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Replacement with a dimethylsilyl or ethylene (-CHz-CH z-) group lengthens the bridge. 5 Having less "flexibility", the one atom silyl bridgeS is believed to impose greater rigidity to the ligand over the two atom ethyl bridge. A direct comparison of isospecific metallocenes differing only in the bridging moiety shows that the silyl-bridged analogues afford higher melting points (Table 6). Table 6 C:omnl~x -'----r--'-- A{'fivitv /1000 - -- - --'-_. --J. mn 0C: O/nmmmm . 2 none 65 The syndiospecific iPr(CpFlu)ZrClzbehaves differently.

A. S. 4 892 851. b. S. 5334677. c. J. , JACS, 110, 6255 (1988). a. J. A. Ewen, JACS, 106, 6355 (1984). b. J. , Makromol. Chern. Macromol. , 48/49, 253 (1991). c. P. App!. 0284708. P. Corradini et ai, Macromolecules, 24,1784 (1991). J. , Proc. Int'I Symposium on Recent Developments in Olefin Polymerization Catalysts, Tokyo, 56, 439 (1989). S. , Catalytic Olefin Polymerization, Vol. S6, p. 531, Eds. T. Keii and K. Soga, Elsevier, 1990. S. , Organometallics, 10, 2349 (1991). a. , Angew. Chern. Int.

High-Molecular-Weight Atactic Polypropylene from Metallocene Catalysts. Influence of Ligand Structure and Polymerization Conditions on Molecular Weight Luigi Resconi, Fabrizio Piemontesi, and Robert L. Jones Montell Polyolefins, G. Natta Research Center, P. Le Donegani 12, 441 00 Ferrara, Italy INTRODUCTION The substitution pattern ofthe 1t-Cp ligands ofmetallocene polymerization catalysts is the major factor influencing both propagation rate and type and extent of chain transfer reactions, that in turn determine the molecular weight of the poly(a-olefin) produced.

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