| 초록 |
In recent year, there has been a growing interest in electropinning because it can prepare polymer fibers with diameter in the range of nano to a few microns. Also, this method has advantages such as simple, convenient and inexpensive. Electrospun nonwoven mats have a large surface area per unit mass, high porosity and very small pore size as well as low air permeability and good aerosol particle protection. Therefore, it can use of considerable interest for wide kinds of applications such as filter, protecting clothing, scaffolds in tissue engineering, biomaterials fields and reinforcing component in composite system, etc. PVAc(poly(vinyla acetate)) nonwoven mats composed uniformly of electrospun fibers with difference average diameter were prepared as controlling polymer concentration. The relationship between the average diameter of fibers and mechanical and air transport properties were investigated. The morphology, gas transparent and mechanical properties of electrospun nonwovens were observed by scanning electron microscopy (SEM), gas permeation analyzer (GPA) and universal testing machine (UTM), respectively. SEM image showed that the fiber diameter was dependant on electrospinning parameters. The molecular weight and concentration were strongly affected on the fiber diameter. The permeability of PVAc nonwoven mats in the N2 gas was continuously decreased as increasing an applied pressure (in the range of 38 to 152 cmHg). Also, it was quite different in accordance with the average fiber diameter.
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