NDLI: Tuning swelling pH and permeability of hydrogel multilayer capsules

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Soft Matter Vol - 4 Issue - 6

Soft Matter Vol - 4 Issue - 5

Soft Matter Vol - 4 Issue - 4

Soft Matter Vol - 4 Issue - 3

Soft Matter Vol - 4 Issue - 2

Soft Matter Vol -3

Soft Matter Vol -2

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Tuning swelling pH and permeability of hydrogel multilayer capsules

Content Provider	Royal Society of Chemistry (RSC)
Author	Kozlovskaya, Veronika Sukhishvili, Svetlana A. Shamaev, Alexei
Copyright Year	2008
Abstract	We report on tuning swelling pH transitions of hydrogel hollow capsules that were derived from hydrogen-bonded multilayers via chemical cross-linking. The capsules were either of a single component – a weak poly(carboxylic acid), such as poly(acrylic acid) (PAA), poly(methacrylic acid) (PMAA), or poly(ethacrylic acid) (PEAA) – or contained two hydrogen-bonding polymers, such as in poly(carboxylic acid)/poly(N-vinylpyrrolidone-co-NH2) (PVPON-co-NH2) or in poly(carboxylic acid)/poly(N-vinylcaprolactam-co-NH2) (PVCL-co-NH2) systems. By varying the acidity of weak polyelectrolytes, the capsule swelling can be tuned over a wide pH range from 5 to 10. We show that differently from one-component capsules, the swelling amplitude of two-component capsules is limited by the number of cross-links provided by amino-containing units of a PVCL-co-NH2copolymer. For two-component capsules with the same degree of cross-linking, permeability at the minimum swelling pH was decreased for PMAA–neutral copolymer capsules as compared to those of PAA–neutral copolymer. We also demonstrate that swelling pH of one-component capsules in the acidic region can be modulated via reversible association with a polycation. The fine control over the swelling pH transitions and permeability of hydrogel capsules enables their use in biomedical applications.
Starting Page	1499
Ending Page	1507
Page Count	9
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	4
Issue Number	7
Journal	Soft Matter
DOI	10.1039/b719952j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	PEAA Polyelectrolyte PAA Carboxylic acid Poly(methacrylic acid) Copolymer Cross-link Gel
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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