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Characteristics of nanofiber nonwovens

Characteristics

Characteristics of nanofiber nonwovens

Graph 1. Effect of basis weight on maximum pore diameter

Pore diameter decreases with the increase of basis weight of overlaid nanofibers. Pore size reduction levels off at around 2g/m2. Nanofibers with smaller diameter are more efficient for pore size reduction.

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Graph 2. Pore size distribution of nanofiber overlaid nonwoven

See extreme narrow pore size distribution.

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Table 1. Physical properties of nanofiber products including nanofiber overlaid nonwovens (two and three-layered products) and nanofiber web by itself

Type Composition Substrate
(polyolefin)		 Basis
weight
(total)		 basis
weight
(nanofiber)		 Thickness Density Porosity Shrinkage(%) Tensile Strength
120oCx1H kg/15mm
g/m2 g/m2 μm g/cm3 % MD CD MD CD
ZNCH Laminated(double layer)
(polyolefin/PVA nanofiber)		 HOP6 8.4 2.0 24 0.350 67.1 3 0 0.663 0.348
HOP2 4.6 2.0 15 0.307 69.7 - - 0.280 0.290
Laminated(triple layer)
(polyolefin/PVA
nanofiber/polyolefin)		 HOP4 12.7 4.0 26 0.488 55.0 - - 0.825 0.721
HOP4 18.4 8.0 27 0.681 39.0 - - 1.400 0.691
ZNCP PVA nanofiber fabrics - 2.2 2.2 5 0.440 65.4 - - 0.138 0.070
- 4.8 4.8 8 0.600 52.8 - - 0.190 0.200
- 10.1 10.1 16 0.631 50.3 - - 0.443 0.523
- 17.3 17.3 31 0.558 56.1 - - 0.838 0.791

Graph 3. DSC curve of nanofiber overlaid nonwoven consisted of PVA nanofiber and PE/PP core-sheath fiber

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Water resistance of PVA nanofibers was achieved by chemical modification. Modified nanofibers are resistant to boiling water.

Graph 4. Effect of boiling treatment on pore size of PVA nanofiber web which is modified to be water resistant

Cross-linking of PVA nanofibers prevents morphological change caused even by boiling treatment.

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