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Ionic-Strength- and pH-Responsive Poly[acrylamide-co-(maleic acid)] Hydrogel Nanofibers

✍ Scribed by Haiqing Liu; Mao Zhen; Renhuang Wu

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
303 KB
Volume
208
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

A novel acrylamide/maleic acid copolymer [P(AM‐MA)] hydrogel nanofibrous membrane with a fiber diameter of ca. 120 nm is prepared by electrospinning an aqueous P(AM‐MA) solution with diethylene glycol as crosslinker, followed by a heat‐induced esterification crosslinking reaction at 145 °C. This hydrogel nanofiber can maintain a fiber form, but becomes distorted and merges to form many physical crosslinking points after immersion in water. The P(AM‐MA) hydrogel nanofibers are sensitive to external stimuli ionic strength and pH. Their water‐swelling ratio decreases with increasing solution ionic strength, and it shows a characteristic two‐step increase at pH = 2.5 and 8.5 in response to the increase of solution pH. The maximum water‐swelling ratios of the P(AM‐MA) hydrogel nanofibers are 18.1 and 22.5 g · g^−1^ in a solution of 0.05 mol · dm^−3^ ionic strength and in an aqueous solution of pH 11, respectively.

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