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Fibrous thermoresponsive Janus membranes for directional vapor transport | | Anupama Sargur Ranganath
; Avinash Baji
; Giuseppino Fortunato
; René M. Rossi
; | | Date: |
1 Jan 2023 | | Abstract: | Wearing comfort of apparel is highly dependent on moisture management and
respective transport properties of the textiles. In today’s used textiles, the
water vapor transmission (WVT) depends primarily on the porosity and the
wettability of the clothing layer next to the skin and is not adapting or
responsive on environmental conditions. The WVT is inevitably the same from
both sides of the membrane. In this study, we propose a novel approach by
development of a thermoresponsive Janus membrane using electrospinning
procedures. We, therefore, targeted a membrane as a bilayer composite structure
by use of PVDF as one layer and a blend of PVDF and PNIPAM as the second layer
changing wettability properties in the range of physiological temperatures.
Tailored electrospinning conditions led to a self-standing membrane
incorporating fiber diameters of 400nm, porosities of 50% for both layers
within the Janus membrane. The WVT studies revealed that the combined effects
of the Janus membrane’s directional wettability and the temperature-responsive
property results in temperature-dependent vapor transport. The results show
that the membrane offers minimum resistance to WVT when the PVDF side faces the
skin, which depicts the side with high humidity, over a range of temperatures.
However, the same membrane shows a temperature-dependent WVT behavior when the
blend side faces the skin. From room temperature of 25 C to an elevated
temperature of 35 C, there is a significant increase in the membrane’s
resistance to WVT. This behavior is attributed to the combined effect of the
Janus construct and the thermoresponsive property. This temperature-controlled
differential vapor transport offers ways to adapt vapor transport independence
of environmental conditions leading to an enhanced wearing comfort and
performance to be applied in fields such as apparel or the packaging industry. | | Source: | arXiv, 2301.00348 | | Services: | Forum | Review | PDF | Favorites | |
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