Photothermal Characterization of Low Density Polyethylene Food Packages
Poley, Luiz H.; Siqueira, Ana P. L.; Silva, Marcelo G. da; Vargas, Helion; Sánchez, Rubén
http://dx.doi.org/10.1590/S0104-14282004000100007
Polímeros: Ciência e Tecnologia, vol.14, n1, p.8-12, 2004
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.
Keywords
Photoacoustic spectroscopy, LDPE, diffusion coefficients
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