NDLI: From polyelectrolyte to polyampholyte microgels: comparison of swelling properties

Content Provider	Springer Nature Link
Author	Das, Mallika Kumacheva, Eugenia
Copyright Year	2006
Abstract	We report the results of comparative studies of the swelling behavior of polyelectrolyte (PE) and polyampholyte (PA) microgels in response to pH, ionic strength, temperature, and solvent composition. Polyelectrolyte microgels used were cross-linked binary copolymers of poly(N-isopropylacrylamide) (polyNIPAm) and acrylic acid (AA) or vinyl imidazole (VI). The PA microgels with an excess of either cationic or anionic groups swelled at low or high pH values, respectively, analogous to PE microgels. The PA microgels with similar amounts of AA and VI groups exhibited marked swelling at both high and low pH values. All PA microgels shrank in the intermediate range of pH due to electrostatic attraction between charged AA and VI moieties. In moderately concentrated salt solutions, PA microgels underwent swelling showing antipolyelectrolyte behavior. The extent of swelling of PA microgels increased with rise in AA content. The temperature-dependent contraction of both PE and PA microgels occurred at higher temperatures when AA and VI groups were charged and hydrophilic. Ion pairing between the AA and VI groups increased the extent of the temperature-induced deswelling in PA microgels. The solvent-dependent swelling of PE and PA microgels in ethanol–water mixtures was governed by competing electrostatic and cosolvency effects.
Starting Page	1073
Ending Page	1084
Page Count	12
File Format	PDF
ISSN	0303402X
Journal	Colloid and Polymer Science
Volume Number	284
Issue Number	10
e-ISSN	14351536
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-05-20
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polyampholyte microgels Zwitterionic Electrostatic interactions Swelling behavior Soft Matter, Complex Fluids Characterization and Evaluation Materials Polymer Sciences 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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