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Study of the chain transfer reaction by hydrogen in the initial stage of propene polymerization
Author(s) -
Mori Hideharu,
Tashino Kunihiko,
Terano Minoru
Publication year - 1995
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.1995.030160903
Subject(s) - polymerization , propene , chain transfer , catalysis , polymer chemistry , living polymerization , chemistry , reagent , polymer , hydrogen , chain termination , molar mass distribution , kinetic chain length , yield (engineering) , solution polymerization , materials science , radical polymerization , organic chemistry , metallurgy
The chain transfer reaction by hydrogen in the initial stage of propene polymerization with MgCl 2 ‐supported Ziegler catalyst was studied by means of the stopped‐flow polymerization. The yield and molecular weight of polypropene produced in the initial stage were not affected by hydrogen. Thus, the method was successfully applied to find the region in which hydrogen does not act as a chain transfer reagent. On the other hand, a chain transfer reaction proceeded in the initial stage of polymerization by using Zn(C 2 H 5 ) 2 . Furthermore, when the catalyst was treated with Al(C 2 H 5 ) 3 before polymerization, the molecular weight of the produced polymer was decreased by using hydrogen, indicating that it acted as a chain transfer agent for the catalyst modified by pre‐treatment.