RT info:eu-repo/semantics/masterThesis
T1 Exploring the limits of foamed electrospun PCL fibers
A1 García Marín, Borja
A2 Universidad de Valladolid. Facultad de Ciencias
K1 Electrospinning
K1 Gas dissolution foaming
K1 Nanofibers
AB Electrospinning, which is a technique capable of producing solid micro and nano fibers through the use of polymers solutions, have been used to produce polycaprolactone (PCL) fibers with different diameters. There are different parameters that influence the final characteristics of the fibers and, specifically, the relationship between the diameters of the fibers and the polymer concentration, the voltage, the flow rate, the distance needle-collector or the humidity have been studied. Furthermore, other techniques have been presented as possibilities to fabricate the hollow fibers, such as dry/melt/wet spinning and extrusion processes. Although those techniques are known nowadays and are used in practical applications, they did not allow producing hollow structures from fibers with a few micrometers of diameter or in the nanometer range. In this work a gas dissolution foaming path was followed, as it has been suggested previously, being an environmentally friendly and easy scalable technique. The fibers with different diameters have been subjected to a one-step gas dissolution foaming path, observing if the method allowed the fabrication of hollow fibers, and explore how the diameter of fibers influence the result. First, solid fibers from around 0.3 to 21 μm were obtained from electrospinning. Then, after the foaming procedure, it was found that fibers of a few micrometers presented hollow structures, while the smallest ones (close to 300nm) remained apparently intact. Moreover, the superficial morphology and the expansion ratio was studied, obtaining hollow fibers of 4 μm of diameter with superficial pores, and others, of about 20 μm of diameter, with an uniform solid skin.
YR 2020
FD 2020
LK http://uvadoc.uva.es/handle/10324/43560
UL http://uvadoc.uva.es/handle/10324/43560
LA eng
NO Departamento de Física de la Materia Condensada, Cristalografía y Mineralogía
DS UVaDOC
RD 24-nov-2024