RT info:eu-repo/semantics/masterThesis
T1 Transparent nanocellular polyetherimide
A1 Lizalde Arroyo, Félix
A2 Universidad de Valladolid. Facultad de Ciencias
K1 Transparent
K1 Nanocellular
K1 Polyetherimide
AB Nanocellular transparent polyetherimide (PEI) with relative density around 0.7 has been produced using the so-called gas dissolution foaming technique. The relationship between the production parameters, the obtained cellular structure, and the transparency of the produced cellular materials has been stablished. Two parallel studies were conducted depending on the saturation parameter (temperature or pression) held constant. Firstly, for a constant saturation temperature (24 ºC), the samples were saturated at 5.5, 10 and 20 MPa (the highest saturation pressures ever used in the literature). On the other hand, the pressure was kept constant (5.5 MPa) to saturate the samples at 24, 0 and -10 ºC. In this way, it was possible to study how these parameters affect solubility, obtaining the highest value of 18% CO2 in the sample saturated at -10 ºC and 5.5 MPa. Thanks to the high solubilities achieved in these saturation processes, cell nucleation density values of 1015 to 1016 nuclei/cm3 and cell sizes below 50 nm have been obtained, as well as a very homogeneous structure. These nanostructures have made it possible to obtain materials with a transparency of up to almost 0.90 for the red colour at a thickness of 0.5 mm.
YR 2023
FD 2023
LK https://uvadoc.uva.es/handle/10324/63637
UL https://uvadoc.uva.es/handle/10324/63637
LA eng
NO Departamento de Física de la Materia Condensada, Cristalografía y Mineralogía
DS UVaDOC
RD 05-jul-2024