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- W2102037897 abstract "Abstract This article discusses a chemical route to prepare new ethylene/propylene copolymers (EP) containing a terminal reactive group, such as ϕ‐CH 3 and OH. The chemistry involves metallocene‐mediated ethylene/propylene copolymerization in the presence of a consecutive chain transfer agent—a mixture of hydrogen and styrene derivatives carrying a CH 3 ( p ‐MS) or a silane‐protected OH (St‐OSi). The major challenge is to find suitable reaction conditions that can simultaneously carry out effective ethylene/propylene copolymerization and incorporation of the styrenic molecule (St‐f) at the polymer chain end, in other words, altering the St‐f incorporation mode from copolymerization to chain transfer. A systematic study was conducted to examine several metallocene catalyst systems and reaction conditions. Both [(C 5 Me 4 )SiMe 2 N( t ‐Bu)]TiCl 2 and rac‐Et(Ind) 2 ZrCl 2 , under certain H 2 pressures, were found to be suitable catalyst systems to perform the combined task. A broad range of St‐f terminated EP copolymers (EP‐ t ‐p‐MS and EP‐ t ‐St‐OH), with various compositions and molecular weights, have been prepared with polymer molecular weight inversely proportional to the molar ratio of [St‐f]/[monomer]. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 1858–1872, 2005" @default.
- W2102037897 created "2016-06-24" @default.
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- W2102037897 date "2005-03-15" @default.
- W2102037897 modified "2023-10-17" @default.
- W2102037897 title "Synthesis of ethylene/propylene elastomers containing a terminal reactive group: The combination of metallocene catalysis and control chain transfer reaction" @default.
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- W2102037897 doi "https://doi.org/10.1002/pola.20672" @default.
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