Fibrous Architecture
Nanofibrous nonwoven structures provide high surface area to volume ratios for specialized filtration and medical textiles. High voltage fields draw electrospun polyurethane from a polymer solution into ultra fine filaments that deposit randomly onto a collector. These webs typically achieve fibre diameters ranging from 100 to 500 nanometres.
Polymer Network
Elasticity and chemical resistance define the polymer network. Because electrospun polyurethane maintains the inherent flexibility of its base elastomer, the resulting nonwoven can withstand substantial mechanical strain without rupturing the delicate nanofibre junctions. Stretch recovery is mandatory.
This resilience makes the material suitable for breathable waterproof membranes.
Production Mechanism
The formation of the web relies on the precise balance of viscosity and conductivity in the spinning dope. As the jet travels toward the grounded target, solvent evaporation causes the electrospun polyurethane to solidify into a permanent mesh. Voltage levels and needle to collector distance dictate the final porosity.
A secondary thermal treatment often follows to stabilize the fibre arrangement.
Performance Threshold
Performance reaches its limit when the physical integrity of the web faces high pressure. While the small pore size stops liquid water, the electrospun polyurethane layer remains vulnerable to delamination if the adhesive bond to the carrier fabric is insufficient. Bulk properties depend on layer density.
