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Swelling behavior of poly(acrylic acid) gels in aqueous ethanol – effects of counterion species and ionic strength
Author(s) -
Nishiyama Yuji,
Satoh Mitsuru
Publication year - 2000
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/(sici)1521-3927(200003)21:4<174::aid-marc174>3.0.co;2-k
Subject(s) - counterion , swelling , aqueous solution , acrylic acid , ionic strength , ethanol , salt (chemistry) , chemistry , ionic bonding , polymer chemistry , salt solution , nuclear chemistry , chemical engineering , ion , organic chemistry , polymer , copolymer , engineering
The swelling behavior of poly(acrylic acid) (PAA) gels in aqueous ethanol (EtOH) was investigated. These gels were prepared by γ‐irradiation and pretreated in aqueous solutions of different pH levels in order to vary the charge density. With increasing pH of the pretreating solutions, a distinct collapse was observed for a PAANa gel in 40–60 vol.‐% EtOH. This effect was less pronounced in the presence of 0.1 M NaCl. Moreover, the deswelling regions were dependent on the counterion species of the used salt solutions, i. e. NaCl or CsCl.