Please use this identifier to cite or link to this item:
https://hdl.handle.net/10316/5043
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Valente, A. J. M. | - |
dc.contributor.author | Jiménez, A. | - |
dc.contributor.author | Simões, A. C. | - |
dc.contributor.author | Burrows, H. D. | - |
dc.contributor.author | Polishchuk, A. Ya. | - |
dc.contributor.author | Lobo, V. M. M. | - |
dc.date.accessioned | 2008-09-01T15:02:58Z | - |
dc.date.available | 2008-09-01T15:02:58Z | - |
dc.date.issued | 2007 | en_US |
dc.identifier.citation | European Polymer Journal. 43:6 (2007) 2433-2442 | en_US |
dc.identifier.uri | https://hdl.handle.net/10316/5043 | - |
dc.description.abstract | Films of cellulose acetate containing different concentrations of meso-octamethyl-porphyrinogen (calix[4]pyrrole) were prepared and characterized using UV-vis and FTIR spectroscopy, DSC and SEM. Incorporation of calix[4]pyrrole 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 calix[4]pyrrole in the composite composition. This effect can be related to the plasticizing effect that the calix[4]pyrrole 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 calix[4]pyrrole 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 calix[4]pyrrole 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 calix[4]pyrrole content for 2:1 electrolytes. | en_US |
dc.description.uri | http://www.sciencedirect.com/science/article/B6TWW-4NFR5CN-3/1/c8e93beea778c4b90e5b2ead92581bb6 | en_US |
dc.format.mimetype | aplication/PDF | en |
dc.language.iso | eng | eng |
dc.rights | openAccess | eng |
dc.subject | Cellulose acetate | en_US |
dc.subject | Calix[4]pyrrole | en_US |
dc.subject | Transport properties | en_US |
dc.subject | Electrolytes | en_US |
dc.title | Transport of solutes through calix[4]pyrrole-containing cellulose acetate films | en_US |
dc.type | article | en_US |
dc.identifier.doi | 10.1016/j.eurpolymj.2007.03.047 | - |
uc.controloAutoridade | Sim | - |
item.fulltext | Com Texto completo | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.grantfulltext | open | - |
item.languageiso639-1 | en | - |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
crisitem.author.dept | Faculty of Sciences and Technology | - |
crisitem.author.parentdept | University of Coimbra | - |
crisitem.author.researchunit | CQC - Coimbra Chemistry Centre | - |
crisitem.author.researchunit | CQC - Coimbra Chemistry Centre | - |
crisitem.author.researchunit | CQC - Coimbra Chemistry Centre | - |
crisitem.author.parentresearchunit | Faculty of Sciences and Technology | - |
crisitem.author.parentresearchunit | Faculty of Sciences and Technology | - |
crisitem.author.parentresearchunit | Faculty of Sciences and Technology | - |
crisitem.author.orcid | 0000-0002-4612-7686 | - |
crisitem.author.orcid | 0000-0003-3127-2298 | - |
crisitem.author.orcid | 0000-0002-5318-3280 | - |
Appears in Collections: | FCTUC Química - Artigos em Revistas Internacionais |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
fileacb3f80cb9864b8796118915a4b4ce3a.pdf | 675.73 kB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.