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Polymerization of Butadiene with V(acac) 3 ‐Methylaluminoxane Catalyst
Author(s) -
Endo Kiyoshi,
Yamanaka Yasuhiro
Publication year - 2001
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 - 10.1002/1521-3935(20010101)202:1<201::aid-macp201>3.0.co;2-d
Subject(s) - methylaluminoxane , polymerization , polymer chemistry , polymer , chemistry , coordination polymerization , molar mass distribution , solution polymerization , materials science , organic chemistry , metallocene
Full Paper: Polymerization of butadiene (Bd) with V(acac) 3 ‐methylaluminoxane (MAO) catalyst was investigated. The microstructure of the polymer was found to depend strongly on the polymerization conditions. High polymerization temperature and high MAO/V(acac) 3 mole ratios were preferential to produce cis ‐1,4 structure. Two kinds of active species were presumed from the GPC measurement of the polymers; one gives a high molecular weight polymer bearing high cis ‐1,4 content, another affords a low molecular weight polymer with high trans ‐1,4 content. A Solvent effect was observed. A polymer consisting of mainly trans ‐1,4 unit was produced in CH 2 Cl 2 in contrast to toluene and n‐heptane in which polymers consisting of mainly cis ‐1,4 structure were observed. The addition of ethyl benzoate, triethylamine, chloranil, and tetracyanoquinodimethane to the V(acac) 3 ‐MAO catalyst gave an influence to not only the activity for the polymerization but also the microstructure of the polymer.