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Wetting Properties of Biopolyester Films Prepared by Thermo-Compression Method  

Rhim, Jong-Whan (Department of Food Engineering, Mokpo National University)
Hong, Seok-In (Korea Food Research Institute)
Publication Information
Food Science and Biotechnology / v.16, no.2, 2007 , pp. 234-237 More about this Journal
Abstract
Water resistance of three biopolyester films, such as poly-L-lactate (PLA), poly-hydroxybutyrate-co-valerate (PHBV), and Ecoflex, and low density polyethylene (LDPE) film was investigated by measuring contact angle of various probe liquids on the films. The properties measured were initial contact angle of water, dynamic change of the water contact angle with time, and the critical surface energy of the films. Water contact angle of the biopolyester films ($57.62-68.76^{\circ}$) was lower than that of LDPE film ($85.19^{\circ}$) indicating biopolyester films are less hydrophobic. The result of dynamic change of water contact angle also showed that the biopolyester films are less water resistant than LDPE film, but much more water resistant than cellulose-based packaging materials. Apparent critical surface energy for the biopolyester films (35.15-38.55 mN/m) was higher than that of LDPE film (28.59 mN/m) indicating LDPE film is more hydrophobic.
Keywords
wetting property; contact angle; surface tension; biopolyester film; thermo-compression;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
Times Cited By Web Of Science : 2  (Related Records In Web of Science)
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