Permeation of water as a tool for characterizing the effect of solvent, film th...

• Autor(es): Valente, Artur J. M. ; Polishchuk, Alexandre Ya. ; Burrows, Hugh D. ; Lobo, Victor M. M.
• Data: 2005
• Identificador Persistente: http://hdl.handle.net/10316/5111
• Origem: Estudo Geral - Universidade de Coimbra
• Assunto(s): Cellulose acetate; Transport; Diffusion coefficient; Solvent
• Tipo de Documento: Artigo
• Idioma: Inglês

Descrição

Cellulose acetate membranes have been used in many applications; of particular interest are reverse osmosis systems, and as a neutral matrix for incorporation of different polymers (e.g., conducting polymers), inorganic ions (e.g., lanthanides) and organic (e.g., pharmaceutical) compounds. The properties of the new polymers derived from cellulose acetate or blends depend on those of cellulose acetate. This work presents an attempt to find links between thermodynamic and kinetic properties of cellulose acetate membranes in equilibrium with water. Water diffusion coefficients in cellulose acetate membranes are reported, measured with a simple water permeation technique. The comparison of these values with the percentage of water uptake and polymer thickness leads to interesting conclusions related with different polymer properties. http://www.sciencedirect.com/science/article/B6TWW-4DVBFCN-7/1/63e48f8aac1513c35feeaa6c746621e1