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Home  >  Journal list  >  Polymer Journal  >  Vol.14  No.5 (1982)  >  pp.371-377

Polymer Journal
<<Previous article Vol.14  No.5 (1982)   pp.371 - 377 Next article>>

Polymerization of Methylpentynes by Transition Metal Catalysts: Monomer Structure, Reactivity, and Polymer Properties

Toshio Masuda1), Masaaki Kawasaki1), Yoshimichi Okano1) and Toshinobu Higashimura1)
1) Department of Polymer Chemistry, Kyoto University

ABSTRACT:  Polymerization of three methylpentynes, that is, 4-methyl-1-pentyne, 3-methyl-1-pentyne and 4-methyl-2-pentyne by MCln, MCln·Ph4Sn, or M(CO)6-CCl4-hv (M=Mo, W) provided in high yields polymers, whose molecular weights were around 1×104. While Ziegler-type catalysts could polymerize only prim- and s-alkylacetylenes, Mo- or W-based catalysts proved to polymerize all seven isomers of 1-hexyne, (C6 alkynes) including the methylpentynes. Isomerization did not occur during the polymerization. The color and softening point of the seven polymers were well correlated to the number and branching of side chain. These polymers generally showed low electrical conductivities (∼10−18 ohm−1 cm−1) and unpaired electron densities (≤1016 spin g−1).


Keyword:
Coordination Polymerization/ Transition Metal Catalyst/ Tungsten Hexachloride/ Molybdenum Pentachloride/ Methylpentyne/ Aliphatic Acetylene/ Monomer Reactivity/ Electrical Conductivity/ Unpaired Electron Density

Published online: March 03, 2006
© Copyright, 2006 by The Society of Polymer Science, Japan

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