You are not logged in Total: 7journals, 20,727articles Online
AccountAccount
Login / Register
Forgot Login?
 
Main menuMain menu
What's new
Journal list
Visiting ranking
Phrase ranking
Polls
About us
 
SearchSearch
 
Journal Site
Advanced Search
 

Home  >  Journal list  >  Polymer Journal  >  Vol.14  No.5 (1982)  >  pp.363-369

Polymer Journal
<<Previous article Vol.14  No.5 (1982)   pp.363 - 369 Next article>>

Electron Exchange Phenomena of Polymers Containing Nitroxyl Radicals

Mikiharu Kamachi1), Masami Tamaki1), Yotaro Morishima1), Shun-ichi Nozakura1), Wasuke Mori2) and Michihiko Kishita2)
1) Department of Macromolecular Science, Faculty of Science, Osaka University
2) Department of Chemistry, College of General Education, Osaka University


ABSTRACT:  The influence of electron exchange on the physical properties of polymers containing nitroxyl radical in their side chains has been studied by ESR, magnetic susceptibility measurement and cyclic voltammetry. ESR study shows that the electron exchange interaction between free radicals bound to a polymer chain is more effective than that between the corresponding monomeric radicals. Magnetic susceptibility (XM) was measured at temperatures between 4K and 273 K. The values of XM for the polymers obey the Curie-Weise Law (XM=c⁄(T−θ)), where magnetic moments obtained from XM show the presence of antiferromagnetic interaction between the nitroxyls of a polymer chain, although the interaction is not large enough to bring about long range ordering in the spin orientation of the nitroxyls. In the corresponding monomers, no antiferromagnetic interaction was observed. Cyclic voltammetry in DMF shows that the electrode process in polymer system is a reversible multiple-electron transfer reaction, where the number of the transfer (np) is 60% of the total free radicals per molecule. A comparison of the shape of the voltammetric response curve in the polymers with that in the corresponding monomers suggests that the interaction between nitroxyl radicals in the polymer is too weak to be reflected in electrochemical behavior.


Keyword:
Electron Exchange/ Nitroxyl/ ESR/ Magnetic Susceptibility/ Cyclic Voltammetry/ Antiferromagnetic Interaction

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

PDFPDF file (J-STAGE)J-STAGEJ-STAGE


SPARC Japan

Terms of Use | Privacy Policy