| Summary: | 碩士 === 國立成功大學 === 生物醫學工程學系 === 101 === Previous studies showed that the mechanical properties of electrospun membranes depend on fiber orientations and fiber alignment. In order to better understand the effect of the fiber orientations and fiber alignment on the mechanical properties of the membranes, we used three materials (PU, PCL, and PLA) to fabricate the electrospun membranes. On the other hand, there are two methods of making composite membranes by the electrospinning, namely blend electrospinning and co-electrospinning. In this study, we used two materials (PCL and PLA) to fabricate composite membranes and examine the differences between the two methods. We collected the electrospun fibers on a grounded rotating drum with varying speeds to prepare membranes with varying fiber alignments. By stacking two membranes with aligned fibers, we made membrane with special direction. We used biaxial mechanical testing to examine the mechanical properties. The results showed that when the fibers were better aligned, the difference in stiffness between the two-axis of the membrane were greater. However, the membrane of the two-axis mechanical properties in off-axis fiber angles, 30° was the same. The stiffness of membranes with highly aligned fibers with off-axis fiber angles, 45° is higher than that of membranes the moderately aligned fibers with off-axis fiber angles, 45°. The composite membranes made by the methods had significantly different mechanical properties even with the same composite ratio. The mechanical properties of the composite membrane made by blend electrospinning were closer to PLA than the composite membrane made by co-electrospinning membranes.
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