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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 18, Number 4
BKCSDE 18(4)
April 20, 1997 

 
Title
Polymerization of Tetrahydrofuran with New Transition Metal Catalyst and Its Mechanism: (p-Methylbenzyl)-o-cyanopyridinium Hexafluoroantimonate
Author
Jun Won Kang, Yang-Kyoo Han
Keywords
Abstract
(p-Methylbenzyl)-o-cyanopyridinium hexafluoroantimonate, a new catalyst, was synthesized by the reaction of o-cyanopyridine with α-bromo-p-xylene followed by exchange of counteranion with SbF6θ. We examined the effect of the catalyst on the bulk polymerization of tetrahydrofuran under various conditions. The catalytic activity was best in the presence of 1 : 1 of epichlorohydrin used as cocatalyst versus catalyst concentration. The resulting polymers had relatively low conversions in 1.0-40%. Their number average molecular weights were in the range of 800 to 5300. Propagation rate increased with increase in temperature according to an Arrhenius expression giving an activation energy of 62 KJ/mol. We also found catalyst proceeds via a cationic mechanism.
Page
433 - 438
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