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Dielectric investigation of the sol-gel transition in the acrylamide/N,N′ methylenebisacrylamide system

✍ Scribed by Ferid Salehli; Huceste Çatalgil-Giz; Ahmet Giz; Orhan Kamer; Baki Altuncevahir

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
116 KB
Volume
77
Category
Article
ISSN
0021-8995

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✦ Synopsis

The acrylamide/N,NЈ-methylenebisacrylamide gelation process was studied by time dependent measurement of real ⑀ I and imaginary ⑀ II parts of the complex dielectric permittivity. The measurements were carried out in the frequency interval 500 Hz to 13 MHz. Strong relaxation behavior of ⑀ I and ⑀ II was observed in all dielectric spectra during the transformation from the sol to the gel state. At all frequencies a maximum in the imaginary part of dielectric constant ⑀ II was observed. The gel point was found by extrapolating this maximum to zero frequency. The behavior of ⑀ I and ⑀ II related to the gelation mechanism is discussed.

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