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Synthesis of α,ω‐dialkenyl isotactic poly(propylene) using bis(4‐methyl‐3‐pentenyl)zinc as a chain transfer reagent
Author(s) -
Kurosawa Hiroki,
Shiono Takeshi,
Soga Kazuo
Publication year - 1994
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1994.021951002
Subject(s) - tacticity , polymer chemistry , propene , zinc , catalysis , polymerization , double bond , reagent , chemistry , bromide , polymer , organic chemistry
Propene polymerization was conducted with the catalyst system composed of TiCl 3 and bis(4‐methyl‐3‐pentenyl)zinc (BMPZ) in the absence or presence of Al(C 2 H 5 ) 2 Cl. The catalyst system with or without Al(C 2 H 5 ) 2 Cl gave isotactic poly(propylene) (PP) with a lower molecular weight as compared to the TiCl 3 /Al(C 2 H 5 ) 2 Cl system. From the 1 H and 13 C NMR analyses, it was found that the polymer produced with the TiCl 3 /BMPZ catalyst possesses a 2,6‐dimethyl‐5‐heptenyl group and a Zn‐PP bond at the initial and terminal ends, respectively. The Zn‐terminated end was then converted to a vinyl group by coupling with allyl bromide in the presence of N ‐methylimidazole to obtain isotactic PP having CC double bonds at both chain ends.