Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Propylene misinsertions

For example, the rates of propylene and 1-butene polymerisation by the rac.-(IndCH2)2ZrCl2—[Al(Me)0]x catalyst increase in the presence of hydrogen roughly by a factor of 10-60 respectively [260]. These polymers were found to be free of misinserted units hydrogenolysis apparently eliminates the slowly inserted 2,1-enchained monomer units and allows the start of a new, fastgrowing polymer chain [scheme (44)] [30],... [Pg.104]

Scheme 29 Insertion sequences leading to the two major types of enchainment defects in propylene polymerization at a Cs-symmetric active center site isomerization (left) and enantioface misinsertion (right). Scheme 29 Insertion sequences leading to the two major types of enchainment defects in propylene polymerization at a Cs-symmetric active center site isomerization (left) and enantioface misinsertion (right).
SCHEME 4.2 Mechanisms for stereoerror formation in propylene polymerization enantiofacial misinsertion, site epimerization, and chain epimerization (with or without site epimerization). (P represents the polymer... [Pg.119]

SCHEME 4.4 Enantiofacial misinsertion in isotactic propylene polymerization generates double m errors (i.e., mm triads). [Pg.120]

See other pages where Propylene misinsertions is mentioned: [Pg.336]    [Pg.336]    [Pg.103]    [Pg.151]    [Pg.69]    [Pg.1070]    [Pg.235]    [Pg.14]    [Pg.44]    [Pg.68]    [Pg.118]    [Pg.121]    [Pg.318]    [Pg.681]    [Pg.188]   
See also in sourсe #XX -- [ Pg.151 ]



SEARCH



Misinsertions

© 2024 chempedia.info