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Please use this identifier to cite or link to this item: http://hdl.handle.net/10362/1133

Título: Polyimide and polyetherimide organic solvent nanofiltration membranes
Autor: Silva, Marta Sofia Fragoso da
Orientador: Livingston, Andrew G.
Crespo, João Paulo G.
Palavras-chave: Ultrafiltração
Solventes orgânicos
Membranas (Tecnologia)
Engenharia química
Issue Date: 2007
Editora: FCT - UNL
Resumo: Integrally asymmetric skinned Lenzing P84 and Matrimid 5218 polymide membranes and Ultem 1000 polyetherimide membranes were prepared. Crosslinking of membranes using aliphatic diamines resulted in marked improvement in chemical stability. This however resulted in a decline in flux with only Lenzing P84 demonstrating good flux in DMF. Further variation of membrane dope parameters and operating conditions allowed for good control of the MWCO of membranes made from Lenzing P84. SEM pictures of Lenzing P84 membranes revealed a significant difference in membranes morphology. The presence of macrovoids increased when using more DMF in the dope solution. These studies demonstrate the possibility of developing OSN membranes using different polyimides and opens up future possibilities for controlling the MWCO of these membranes. Preliminary modelling demonstrates that good control of the MWCO could extend the application of OSN membranes to allow the fraction of molecules in the NF range.
URI: http://hdl.handle.net/10362/1133
Appears in Collections:FCT: DQ - Dissertações de Mestrado

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