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Functionalization of Hydrogels Based on N ‐Isopropyl‐acrylamide and Cationic Surfactant Monomers upon Electrostatic Self‐Assembly
Author(s) -
Friedrich Tatjana,
Trinker Anna,
Tieke Bernd
Publication year - 2010
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201000021
Subject(s) - cationic polymerization , self healing hydrogels , polymer chemistry , monomer , bromide , chemistry , aqueous solution , counterion , copolymer , pulmonary surfactant , swelling , chemical engineering , organic chemistry , polymer , ion , biochemistry , engineering
Summary: Positively charged copolymer hydrogels based on N‐isopropyl‐acrylamide (NiPAAm) and a cationic surfactant monomer (surfmer) were functionalized upon electrostatic self‐assembly of functional organic or inorganic complex counterions in the gel. As cationic surfmers 11‐acryloylundecyltrimethylammonium bromide (AUTMAB) or 11‐methacryloyl‐undecyltrimethylammonium bromide (MUTMAB) were used. The hydrogels were prepared from a micellar aqueous solution of the surfmer and NiPAAm either upon 60 Co‐gamma irradiation, or upon chemical cross‐linking using methylenebisacrylamide as cross‐linker and 1,4‐diaminobutane as accelerator. Electrostatic self‐assembly was facilitated utilizing the thermoresponsive swelling and shrinking of the hydrogel. Several examples of gel functionalization are described such as in‐situ preparation of Prussian Blue and Pd 0 nanoparticles, and induction of fluorescent properties. The catalytic activity of the palladium‐containing gel was studied by investigating the reduction of 4‐nitrophenol (4‐NP) with sodium borohydride as a model reaction. Fluorescent gels can be prepared upon exchange of bromide against 1‐pyrenesulfonate ions in the gel.