Dielectric spectroscopy study of poly(methacrylic acid) gels

It was shown that swelling behavior of polyelectrolyte gels is determined by the state of network counterions. In nonpolar media the ionomer regime of swelling behavior can be realized, this regime is characterized by the formation of ion pairs and ion multiplets. Dielectric spectroscopy and conduct...

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Bibliographic Details
Published in:Macromolecular symposia. 2001-06, Vol.170 (1), p.91-98
Main Authors: Sitnikova, Natalia L., Philippova, Olga E., Malyshkina, Inna A., Gavrilova, Nadejda D., Khokhlov, Alexei R.
Format: Article
Language:English
Subjects:
Dielectrics
Dispersions
Gels
Ion pairs
Media
Methyl alcohol
Spectroscopy
Swelling
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Summary:It was shown that swelling behavior of polyelectrolyte gels is determined by the state of network counterions. In nonpolar media the ionomer regime of swelling behavior can be realized, this regime is characterized by the formation of ion pairs and ion multiplets. Dielectric spectroscopy and conductivity measurements of the charged poly(methacrylic acid) gels in media rather low polarity in the frequency range from 102 to 105 Hz were made in order to detect the appearance of ionic multiplets. Extremely high values of dielectric dispersion for both swollen in methanol and dried gels at low frequencies can be explained by aggregation of ion pairs into multiplets with high polarizability. The appearance of resonance peak on the dielectric spectra of the samples under the study gives evidence of the existence of ionic aggregates mainly of the same size.
ISSN:1022-1360
1521-3900
DOI:10.1002/1521-3900(200106)170:1<91::AID-MASY91>3.0.CO;2-1