NDLI: Polyampholyte gels of a cross-linked polyanion or polycation network into which an oppositely charged polyion was immobilized : Their pH-induced swelling/shrinking characteristics

Content Provider	Springer Nature Link
Author	Masaki, Mika Kokufuta, Etsuo
Copyright Year	2012
Abstract	Three polyampholyte gels (G1 to G3) composed of acrylic acid (AA), 1-vinylimidazole (VI) and N-isopropylacrylamide (NIPA) were prepared: G1 with a pre-gel solution (pH ≈ 12) containing NIPA (700 mM), AA (150 mM), VI (150 mM) and N,N′-methylenebis(acrylamide) (10 mM); G2 with the same pre-gel, except for containing poly(acrylic acid) (PAA) (150 unit mM) instead of AA; and G3 with the same pre-gel, except for containing poly(1-vinylimidazole) (PVI) (150 unit mM) instead of VI. The immobilization of PAA ( $$ {\overline M_{\text{w}}} = {2}0{5},000 $$ ) and PVI ( $$ {\overline M_{\text{w}}} = <$ > < $>35,900 $$ ) resulted in transparent G2 and G3, respectively, while G3 with another PVI ( $$ {\overline M_{\text{w}}} = {193},000 $$ ) was opaque. Potentiometric titrations and swelling measurements of an anionic and a cationic copolymer gel (as a control sample) suggested that each polyampholyte gel exhibits an isoelectric point (pI) at pH ≈ 5.6, at which the electrostatic attraction between the carboxylate and imidazole ions leads to gel collapse. Indeed, all the ampholyte gels underwent a collapse transition at pH around the pI upon cyclic pH changes (first increased and then decreased). The pH region where gel collapse was observed, however, was broader for G2 and G3 (with immobilized polyions) than for G1 (random terpolymer gel). The swelling/deswelling characteristics of transparent and opaque G3 gels were different from each other, and also from those of G1 and G2. These results were discussed in terms of the role of hydrogen bonding of the amide with the carboxyl or imidazole groups in the collapse transition of the ampholyte gels.
Starting Page	669
Ending Page	681
Page Count	13
File Format	PDF
ISSN	0303402X
Journal	Colloid and Polymer Science
Volume Number	291
Issue Number	3
e-ISSN	14351536
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-09-04
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polyampholyte gels Acrylic acid 1-Vinylimidazole N-Isopropylacrylamide Random copolymerization Gel immobilization Polymer Sciences Soft and Granular Matter, Complex Fluids and Microfluidics Characterization and Evaluation of Materials Physical Chemistry Food Science
Content Type	Text
Resource Type	Article
Subject	Colloid and Surface Chemistry Materials Chemistry Physical and Theoretical Chemistry Polymers and Plastics

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