Journal
CARBOHYDRATE POLYMERS
Volume 79, Issue 2, Pages 269-276Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2009.08.002
Keywords
Barrier properties; Biodegradable films; Kappa-carrageenan; Pectin; Mica flakes
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Funding
- Fundacao para a Ciencia e a Tecnologia [SFRH/BPD/26178/2005, POCTI/EQU/45595/2002]
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/26178/2005, POCTI/EQU/45595/2002] Funding Source: FCT
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In this work, the enhancement of the barrier properties to water vapour and gases (CO2 and O-2) Of a Polymeric matrix composed by kappa-carrageenan and pectin (66.7% kappa-carrageenan), with the inclusion of mica flakes, was studied. The effect of the films mica content on the water vapour permeability (WVP) was dependent on the driving force applied. A higher WVP reduction (of about 40% for a mica content of 10%. mass of mica per mass of dry polymer), was observed when the films were more homogenously hydrated throughout their thickness. A significant decrease was also observed for both CO2 and O-2 permeabilities (73% and 27%, respectively), in conditions where the films were plasticized with water (25% of water, dry basis), for which there is a depletion of the good barrier properties characteristic of dry polysaccharide films. In addition, the composition of 10% of mica flakes in the polymer matrix represented a critical volume fraction of inorganic particles, above which there was a decrease of the films barrier properties, for all components tested. (C) 2009 Elsevier Ltd. All rights reserved.
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