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- W2078005129 abstract "The chain ends of polypropylene (PP) polymerized at 100°C without molecular hydrogen addition over an MgCl2· TiCl4· dioctylphthalate/Et3Al/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 Et3Al at 1,2-inserted sites. On the other hand, the terminal groups of PP obtained at 100°C with molecular hydrogen addition over this catalyst system were ethyl, isobutyl, n-propyl and n-butyl groups. The newly detected terminal groups were formed by chain-transfer reactions by hydrogen at 2,1-inserted sites. The observed activity enhancement in this catalyst system would be due to the conversion of dormant 2,1-inserted sites into the active sites by hydrogen addition." @default.
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- W2078005129 date "1995-01-01" @default.
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- W2078005129 title "A study of chain-end structures of polypropylene prepared with MgCl2-supported titanium catalyst" @default.
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- W2078005129 doi "https://doi.org/10.1016/0032-3861(96)81630-2" @default.
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