Antimicrobial and ultraviolet protective properties of nanocomposite fiber webs
G. S. SivaKumar
lignin, nano composite fiber, antimicrobial property, ultraviolet protection, electro spinning, cross linking
Lignin/poly(vinyl alcohol) (PVA) nano composite fibers with different lignin concentrations were developed via electro spinning to investigate further possible applications of lignin, an under-utilized renewable biomass material. The antimicrobial and ultraviolet (UV) absorption properties of lignin/PVA nano composite fibers were evaluated to determine whether the inherent functionalities of lignin remain in the final material. An environmentally benign cross linking method was sought to increase the stability of lignin/PVA nano composite fibers in aqueous media. The cross linking and in solubilization of the lignin/PVA nano composite fibers was achieved by combining several cross linking techniques: water vapor treatment at 80_C for 180 min, photo-irradiation for 30 min under visible light at a distance of 17 cm, and heat treatment at 200_C for 60 min. Both lignin/PVA nano composite fiber webs—containing 50 and 85 wt% of lignin at a 3.0 g/m2 web area density, respectively—showed a 99.9% reduction rate against Staphylococcus aureus, but no reduction against Escherichia coli. The same systems exhibited ultraviolet protection factors (UPF) of >50, indicating excellent UV protection. These findings demonstrate the potential of lignin-based composite fibers, and may widen the range of applications for this biomass material.
Article Details
Unique Paper ID: 150348

Publication Volume & Issue: Volume 1, Issue 9

Page(s): 125 - 130
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