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Smart Stimuli-Responsive Polylactic Acid-Hydrogel Fibers Produced via Electrospinning
Danaja Štular,Magnus Kruse,Vera Župunski,Laura Kreinest,Jožef Medved,Thomas Gries,Andreas Blaeser,Ivan Jerman,Barbara Simončič,Brigita Tomšič 한국섬유공학회 2019 Fibers and polymers Vol.20 No.9
In this research we propose a new type of smart microfibers, distinguished by moisture management and proactivetemperature and pH controlled release activity. Hydrogel with submicron-sized particles based on poly(Nisopropylacrylamide)(poly-NiPAAm) and chitosan (PNCS hydrogel) was incorporated into the structure of poly(lactic acid)(PLA) microfibers using the electrospinning technique. Composites with different PLA to PNCS hydrogel ratios wereprepared, and the chemical and morphological properties of the samples were studied using SEM, FT-IR and Ramanmapping. Additionally, the moisture management properties, which were provided by the temperature and pH-related phasechange transition of the incorporated PNCS hydrogel, were studied by determining the temperature-related static contactangle, thin-layer wicking, moisture content and pH-related water uptake. The loading and release abilities of the incorporatedPNCS hydrogel were studied using fluorescent microscopy. The increased concentration of the PNCS hydrogel in spinningsolutions resulted in greater variations in fiber thickness and deterioration of the mechanical properties of the fibers; thus, thehighest concentration of the PNCS hydrogel that could be incorporated within the fibers was found to be 20 % of the spinningmass. The composite sample showed temperature and pH responsiveness, a successful fluorescent-dye loading ability and itscontrolled release at predetermined conditions.
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