Abstract
Ultra-fine fibrous membranes were prepared by electrospinning of aqueousmixtures of poly(acrylic acid) and poly(vinyl alcohol) at 17%–83% PAAor 0.14–3.5 COOH/OH molar ratios and cross-linked by heat-induced(140 °C,5 min) esterification. The fibre diameters increased from 270 to 450 nm with increasing PAAcontents. The swelling ratio of the fibrous hydrogels increased up to 31 times their dryweight with increasing pH from 2 to 7, and most significantly between pH 4 and pH 5. Theliquid uptake of the fibrous hydrogels was attributed to both the liquid diffused into thefibres and that held in the inter-fibre pores. About 53%, 35%, 43% and 37% of the swellingwas contributed by the liquid in the inter-fibre pores when the fibrous hydrogels wereswollen at pH 2, 4, 5 and 7, respectively. The fully swollen fibrous membranes could betriggered by an applied electric field to swell further. Such additional swelling wasdependent upon the polymer compositions, strength of electric field and pH, and wasreversible.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
