| Revista: | Brazilian journal of chemical engineering |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000308918 |
| ISSN: | 0104-6632 |
| Autors: | Reis, R. A1 Nobrega, R Tavares, F. W2 Oliveira, J. Vladimir3 |
| Institucions: | 1Universidade Federal do Rio de Janeiro, Instituto Alberto Luiz Coimbra de Pos-Graduacao e Pesquisa de Engenharia, Rio de Janeiro. Brasil 2Universidade Federal do Rio de Janeiro, Escola de Quimica, Rio de Janeiro. Brasil 3Universidade Regional Integrada do Alto Uruguai e das Missoes, Departamento de Engenharia de Alimentos, Erechim, Rio Grande do Sul. Brasil |
| Any: | 2004 |
| Període: | Dic |
| Volum: | 21 |
| Número: | 4 |
| Paginació: | 611-619 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental |
| Resumen en inglés | There are numerous examples of the importance of small molecule migration in polymeric materials, such as in drying polymeric packing, controlled drug delivery, formation of films, and membrane separation, etc. The Chapman-Enskog kinetic theory of hard-sphere fluids with the Weeks-Chandler-Andersen effective hard-sphere diameter (Enskog-WCA) has been the most fruitful in diffusion studies of simple fluids and mixtures. In this work, the ability of the Enskog-WCA model to describe the temperature and concentration dependence of the mutual diffusion coefficient, D, for a polystyrene-toluene system was evaluated. Using experimental diffusion data, two polymer model approaches and three mixing rules for the effective hard-sphere diameter were tested. Some procedures tested resulted in models that are capable of correlating the experimental data with the refereed system well for a solvent mass fraction greater than 0.3 |
| Disciplines | Química |
| Paraules clau: | Química de polímeros, Ingeniería química, Sistemas polímero-solvente, Coeficiente de difusión, Teoría cinética de Chapman-Enskog |
| Keyword: | Chemistry, Polymer chemistry, Chemical engineering, Polymer-solvent systems, Diffusion coefficient, Chapman-Enskog kinetic theory |
| Text complet: | Texto completo (Ver HTML) |
