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Air permeability (a) and (b) water vapor transmission rate of specimens (Con.: plain face fabric, ESF: electrospun PU web/fabric, CD and CW: PU resin coated fabrics). Reprinted with permission from [283]. © 2007 Springer-Verlag. SEM images of (c) self-assembled PU nanofibrous membranes with honeycomb-like structure (reprinted with permission from [287]. © 2006 WILEY-VCH Verlag GmbH & Co.) and (d) PU NFN membranes. Reprinted with permission from [30]. © 2011 WILEY-VCH Verlag GmbH & Co.
