期刊
JOURNAL OF APPLIED POLYMER SCIENCE
卷 134, 期 48, 页码 -出版社
WILEY
DOI: 10.1002/app.45558
关键词
films; packaging; polyolefins; synthesis and processing techniques
资金
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET, Argentina)
- Universidad Nacional de Cordoba (UNC, Argentina)
- Agencia Nacional de Promocion Cientifica y Tecnologica (ANPCyT, Argentina) [2011-0726]
- CONICET
Release kinetics of thymoquinone and R-(+)-pulegone impregnated in low-density polyethylene (LDPE) films into air and the effect of supercritical CO2-assisted impregnation process on the diffusional properties of these films were investigated. The incorporation of both ketones into LDPE films was performed under different conditions (pressure, depressurization rate, time, and initial ketone mole fraction). Release experiments were performed under controlled laboratory conditions (24 degrees C, 60% relative humidity), and the total release profile was determined gravimetrically, while the individual release of each ketone was quantified by Fourier transformed infrared. The experimental data were used to fit a mass transfer model based on the second Fick's law for unsteady-state diffusion, and the diffusion coefficients of both ketones in LDPE were estimated, ranging from 2.35 x 10(-13) to 5.53 x 10(-13) m(2)s(-1) (thymoquinone) and from 1.24 x 10(-13) to 4.52 x 10(-13) m(2)s(-1) (pulegone). Finally, analysis of variance testing indicated that impregnation pressure and depressurization rate (and their combination) have significant effects on the diffusion coefficient values. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45558.
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