NDLI: Polyelectrolyte microgels based on poly-N-isopropylacrylamide: influence of charge density on microgel properties, binding of poly-diallyldimethylammonium chloride, and properties of polyelectrolyte complexes

Content Provider	Springer Nature Link
Author	Kleinen, Jochen Richtering, Walter
Copyright Year	2011
Abstract	The influence of the charge density of microgels on the binding of oppositely charged polyelectrolytes was investigated. The charge density in the microgels was varied via the amounts of charged comonomer (as e.g., methacrylic acid) during microgel synthesis and also by changing the reaction conditions in order to influence the distribution of the charged comonomer inside the poly-N-isopropylacrylamide-co-methacrylic acid microgel. The variation in charge density was monitored by taking advantage of the polyelectrolyte effect during acid–base titration. Data of titrations of several microgels were analyzed by a modified Henderson–Hasselbalch equation to monitor the influence of the charge density. The microgels contain either different amounts of cross-linker but same amounts of charged comonomer or the microgels were synthesized with same amounts of cross-linker but different functional monomers with different reactivities yielding different spatial distributions. Charge density and spatial distribution of charges in the microgel strongly influence swelling and interaction with polyelectrolytes. As expected, a highly charged microgel binds more polyelectrolyte than a microgel with low amount of charged groups. The amount, however, does not only scale with the number of charges per microgel but also with the charge density of the microgel. The lower the charge density of the microgel, the more polyelectrolyte per negative charge can bind. In addition, the charge density determines whether and at which composition charge reversal of the microgel–polyelectrolyte complexes occur.
Starting Page	739
Ending Page	749
Page Count	11
File Format	PDF
ISSN	0303402X
Journal	Colloid and Polymer Science
Volume Number	289
Issue Number	5
e-ISSN	14351536
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-03-30
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Charge density Polyelectrolytes Polycations Microgels Methacrylic acid Physical Chemistry Polymer Sciences Soft and Granular Matter, Complex Fluids and Microfluidics Food Science Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Colloid and Surface Chemistry Materials Chemistry Physical and Theoretical Chemistry Polymers and Plastics

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