Volume 6, Issue 21 (2009)
FSCT 2009, 6(21): 35-42 |
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Investigating of physical properties of carboxymethyl cellulose – oleic acid composite biodegradable edible films. FSCT 2009; 6 (21) :35-42
URL: http://fsct.modares.ac.ir/article-7-4113-en.html
URL: http://fsct.modares.ac.ir/article-7-4113-en.html
Abstract: (6899 Views)
Carboxymethyl cellulose is the most abundant carbohydrate biopolymer that has excellent film-forming properties. But its main problem is its poor resistance to water vapour transport. In this study the effect of glycerol as plasticiser and oleic acid as an edible hydrophobic agent were investigated. Results showed that by increasing of oleic acid up to a certain content, moisture uptake decreased significantly (about 53/5%). By Increasing the concentration of glycerol significantly increased moisture uptake (about 64%). Studying of mechanical properties, showed that both glycerol and oleic acid have plasticizing effect on the films but glycerol showed more effective role on decreasing tensile strength and increasing flexibility then oleic acid. Both glycerol and oleic acid are able to decrease glass transition temperature of films. But the effect of the glycerol on the thermal properties of films was higher than oleic acid.
Keywords: Mechanical properties, Carboxymethyl cellulose, Oleic acid, Moisture uptake, optical properties
Received: 2008/05/3 | Accepted: 2008/08/4 | Published: 2009/05/4
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