Dielectric relaxation spectroscopy of reactive network-forming polymers

Dipole dynamics in network‐forming epoxy‐amine formulations were investigated by dielectric relaxation spectroscopy. The unreacted liquid monomer mixture was characterized by a single αβ process at high frequencies. The αβ relaxation peak broadens with the progress of chemical reactions and separate...

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Bibliographic Details
Published in:Polymers for advanced technologies 1998-10, Vol.9 (10-11), p.721-726
Main Authors: Fitz, Benjamin D., Mijovic, Jovan
Format: Article
Language:English
Subjects:
dielectric relaxation
dipole dynamics
glass former
reactive networks
Online Access:Get full text
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Summary:Dipole dynamics in network‐forming epoxy‐amine formulations were investigated by dielectric relaxation spectroscopy. The unreacted liquid monomer mixture was characterized by a single αβ process at high frequencies. The αβ relaxation peak broadens with the progress of chemical reactions and separates into two peaks: α which shifts to lower frequencies and longer relaxation times, and a second peak at high frequency (megahertz range) of diminishing intensity, but essentially unchanging relaxation time. The most probable relaxation times were calculated and plotted as a function of reciprocal temperature resulting in activation energy plots. It was shown that the splitting of the αβ process into α and β processes can be brought about by either cooling a liquid without changing its structure, or continuing chemical reactions (i.e. changing the structure) while maintaining a constant temperature. © 1998 John Wiley & Sons, Ltd.
ISSN:1042-7147
1099-1581
DOI:10.1002/(SICI)1099-1581(1998100)9:10/11<721::AID-PAT838>3.0.CO;2-B