Nanofiber structural body and collecting apparatus using the nanofiber structural body, and method of producing the nanofiber structural body

摘要

Based on an electrospinning method, a layer A formed of a polymer continuous phase is formed by: setting a potential difference between an ejection portion configured to eject a polymer solution and a collecting portion configured to collect the polymer nanofibers to a voltage value at which the polymer nanofibers can be spun; and setting the potential of the collecting portion to a low value with respect to a ground potential. Next, a layer B formed of polymer nanofibers and a polymer continuous phase is formed by increasing the potential of the collecting portion without stopping the application of voltages to the ejection portion and the collecting portion. Further, a layer C formed of polymer nanofibers is formed by increasing the potential of the collecting portion without stopping the application of the voltages to the ejection portion and the collecting portion.

主权项

1. A polymer nanofiber structural body, comprising:
a layer A formed of a polymer continuous phase; a layer B formed of polymer nanofibers and a polymer continuous phase, which partially fills a space between the polymer nanofibers; and a layer C formed of polymer nanofibers, the layer A, the layer B, and the layer C being stacked in the stated order, wherein: polymer abundance ratios of the layer A, the layer B, and the layer C satisfy a relationship of (polymer abundance ratio of layer A)>(polymer abundance ratio of layer B)>(polymer abundance ratio of layer C); the layer C has an average pore diameter of 10 nm to 50,000 nm; the polymer continuous phase of the layer A, the polymer nanofibers and polymer continuous phase of the layer B, and the polymer nanofibers of the layer C comprise the same polymer material; and the polymer continuous phase of the layer A is continuous with the polymer continuous phase of the layer B, and at least part of the polymer nanofibers of the layer B are continuous with the polymer nanofibers of the layer C.