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|Title:||Transport of solutes through calixpyrrole-containing cellulose acetate films||Authors:||Valente, A. J. M.
Simões, A. C.
Burrows, H. D.
Polishchuk, A. Ya.
Lobo, V. M. M.
|Keywords:||Cellulose acetate; Calixpyrrole; Transport properties; Electrolytes||Issue Date:||2007||Citation:||European Polymer Journal. 43:6 (2007) 2433-2442||Abstract:||Films of cellulose acetate containing different concentrations of meso-octamethyl-porphyrinogen (calixpyrrole) were prepared and characterized using UV-vis and FTIR spectroscopy, DSC and SEM. Incorporation of calixpyrrole into cellulose acetate leads to a decrease in the degree of hydrophilicity of the polymeric matrix. However, a slight increase in the percentage of water uptake of the polymer is found with an increase of the initial amount of calixpyrrole in the composite composition. This effect can be related to the plasticizing effect that the calixpyrrole provokes in the cellulose acetate. A comparative study of transport parameters of oxygen and some non-associated electrolytes (sodium, copper(II) and nickel chlorides) was carried out. The diffusion coefficients of molecular oxygen through cellulose acetate films decrease with an increase of the concentration of calixpyrrole in the composite films. The transport (diffusion and permeation) of the above mentioned electrolytes through a set of composite films shows a decrease of permeability and diffusion coefficients with an increase of calixpyrrole concentration. Such behaviour is typical of systems where interactions between the polymer and diffusing species occur. However, from the analysis of the distribution coefficient, it was found that those interactions are only dependent on the calixpyrrole content for 2:1 electrolytes.||URI:||http://hdl.handle.net/10316/5043||DOI:||10.1016/j.eurpolymj.2007.03.047||Rights:||openAccess|
|Appears in Collections:||FCTUC Química - Artigos em Revistas Internacionais|
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