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The chain-end groups of the polypropylene (PP) polymerized without addition of molecular hydrogen over a MgCl 2 .TiCl 4 .dioctylphthalate/Et 3 Al catalyst system consisted of n-butyl, n-propyl, vinylidene and vinyl groups in addition to ethyl and i-butyl groups which were detected in the PP prepared under the same polymerization conditions except for the addition of diphenyldimethoxysilane...
The chain ends of polypropylene (PP) polymerized at 100 o C without molecular hydrogen addition over an MgCl 2 . TiCl 4 . dioctylphthalate/Et 3 Al/diphenyldimethoxysilane catalyst system consisted of ethyl and isobutyl groups. This indicates that the chain-transfer reaction in the production of this PP occurred mainly by Et 3 Al at 1,2-inserted sites. On the...
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