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- W2085822882 abstract "Abstract Ultrafine hydrogel fibers that were responsive to both temperature and pH signals were prepared through the electrospinning of poly( N ‐isopropylacrylamide) (PNIPAAm) and poly(acrylic acid) mixtures in dimethylformamide. Both the diameters (700 nm to 1.2 μm) and packing of the fibers could be controlled through changes in the polymer compositions and PNIPAAm molecular weights. These fibers were rendered water‐insoluble by the addition of either Na 2 HPO 4 or poly(vinyl alcohol) (PVA) to the solution, followed by the heat curing of the fibers. The fibers crosslinked with Na 2 HPO 4 swelled to 30–120 times in water; this was significantly higher than the swelling of those crosslinked with PVA. The PVA‐crosslinked hydrogel fibers, however, exhibited faster swelling kinetics; that is, they reached equilibrium swelling in less than 5 min at 25 °C. They were also more stable after 1 week of water exposure; that is, they lost less mass and retained their fibrous form better. All the hydrogel fibers showed a drastic increase in the swelling between pH 4 and 5. The PVA‐crosslinked hydrogel fibers exhibited distinct temperature‐responsive phase‐transition behavior of PNIPAAm, whereas the Na 2 HPO 4 ‐crosslinked hydrogel fibers showed altered two‐stage phase transitions that reflected side‐chain modification of PNIPAAm. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 6331–6339, 2004" @default.
- W2085822882 created "2016-06-24" @default.
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- W2085822882 date "2004-11-05" @default.
- W2085822882 modified "2023-10-17" @default.
- W2085822882 title "Ultrafine hydrogel fibers with dual temperature- and pH-responsive swelling behaviors" @default.
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- W2085822882 doi "https://doi.org/10.1002/pola.20461" @default.
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