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Temperature‐Sensitive Poly( N ‐isopropylacrylamide) Hydrogels with Macroporous Structure and Fast Response Rate
Author(s) -
Zhang JianTao,
Cheng SiXue,
Huang ShiWen,
Zhuo RenXi
Publication year - 2003
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200390061
Subject(s) - poly(n isopropylacrylamide) , self healing hydrogels , aqueous solution , scanning electron microscope , materials science , swelling , lower critical solution temperature , chemical engineering , polymerization , polymer chemistry , copolymer , chemistry , polymer , composite material , organic chemistry , engineering
Macroporous temperature‐sensitive poly( N ‐isopropylacrylamide) (PNIPA) hydrogels were prepared by a novel phase‐separation technique to improve the response properties. In comparison with a conventional PNIPA hydrogel prepared in water, these macroporous hydrogels, prepared by polymerization in aqueous sucrose solutions, have higher swelling ratios at temperatures below the lower critical solution temperature and exhibit much faster response rates to temperature changes.Scanning electron microscopy image of the surface of a PNIPA hydrogel, prepared in 1.50 M aqueous sucrose solution.