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Dielectric investigation of the sol‐gel transition in the acrylamide/ N,N′ methylenebisacrylamide system
Author(s) -
Salehli Ferid,
ÇatalgilGiz Huceste,
Giz Ahmet,
Kamer Orhan,
Altuncevahir Baki
Publication year - 2000
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(20000711)77:2<463::aid-app24>3.0.co;2-m
Subject(s) - dielectric , relaxation (psychology) , acrylamide , permittivity , gel point , materials science , dielectric permittivity , polymer chemistry , analytical chemistry (journal) , chemistry , composite material , polymer , copolymer , chromatography , psychology , social psychology , optoelectronics
The acrylamide/ N , N ′‐methylenebisacrylamide gelation process was studied by time dependent measurement of real ϵ I and imaginary ϵ 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 ϵ I and ϵ 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 ϵ II was observed. The gel point was found by extrapolating this maximum to zero frequency. The behavior of ϵ I and ϵ II related to the gelation mechanism is discussed. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 463–466, 2000