2026-05-05T13:07:03Zhttps://uvadoc.uva.es/oai/requestoai:uvadoc.uva.es:10324/636372025-07-31T20:02:02Zcom_10324_38col_10324_787
UVaDOC
advisor
Martín de León, Judit
advisor
Bernardo García, Victoria
author
Lizalde Arroyo, Félix
editor
Universidad de Valladolid. Facultad de Ciencias
2023-12-14T16:41:27Z
2023-12-14T16:41:27Z
2023
https://uvadoc.uva.es/handle/10324/63637
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.
eng
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Transparent nanocellular polyetherimide
info:eu-repo/semantics/masterThesis
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URL
https://uvadoc.uva.es/bitstream/10324/63637/1/TFM-G1867.pdf
File
MD5
154ca5b240aed4958208c97372cacf45
1871420
application/pdf
TFM-G1867.pdf