| Journal: | Polimeros (Sao Carlos) |
| Database: | PERIÓDICA |
| System number: | 000314199 |
| ISSN: | 1678-5169 |
| Authors: | Poley, Luiz H1 Siqueira, Ana P. L Silva, Marcelo G. da Vargas, Helion Sanchez, Ruben2 |
| Institutions: | 1Universidade Estadual do Norte Fluminense, Laboratorio de Ciencias Fisicas, Campos dos Goytacazes, Rio de Janeiro. Brasil 2Universidade Estadual do Norte Fluminense, Laboratorio de Materiais Avancados, Campos dos Goytacazes, Rio de Janeiro. Brasil |
| Year: | 2004 |
| Season: | Ene-Mar |
| Volumen: | 14 |
| Number: | 1 |
| Pages: | 8-12 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental, aplicado |
| English abstract | The present work discuss the applicability of photothermal techniques for determining diffusion coefficients of oxygen and carbon dioxide of commercial low-density polyethylene (LDPE). The methodology involves the monitoring of diffused gas by a photoacoustic analyzer. Diffusion coefficients measured for CO2 and O2 were 2.77 x 10-8 cm²/s and 1.68 x 10-7 cm²/s, respectively. To support the gas diffusion results, thermal properties were studied using photoacoustic spectroscopy and crystallinity was determined using X-ray diffraction. Values obtained for thermal diffusivity and specific heat capacity were 1.65 x 10-3cm²/s and 2.33 J.cm-3K-1, which are in good agreement with values available in the literature for pure LDPE and thus assure reliability of diffusion coefficients values |
| Disciplines: | Química |
| Keyword: | Química de polímeros, Polietileno de baja densidad, Coeficiente de difusión, LDPE, Espectroscopía fotoacústica, Empaque de alimentos |
| Keyword: | Chemistry, Polymer chemistry, Low density polyethylene, Diffusion coefficient, Photoacoustic spectroscopy, LDPE, Food packaging |
| Full text: | Texto completo (Ver HTML) |
