Thermal Molecular Motion of Poly(methyl methacrylate) in Electrospun Nanofiber Mats
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초록
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Nonwoven fabrics have been widely used for many applications such as cellular scaffolds, filtration membranes, and etc. However, it seems that a geometrical effect of nano-fibers on physical properties of the nonwoven fabrics is not clear for a moment. We here examined thermal molecular motion of poly(methyl methacrylate) with different tacticity in nanofiber mats prepared by an electro-spinning method. The glass transition temperature was higher for the nanofiber mat than for the film. In addition, the apparent activation energy of the segmental motion (ΔHα*) was higher for the nanofiber mat than for the film. A possible explanation for these finding is that there exists the structural and thereby the mobility gradients in the nanofibers along the radial direction.