Journal
JOURNAL OF POLYMERS AND THE ENVIRONMENT
Volume 22, Issue 3, Pages 409-416Publisher
SPRINGER
DOI: 10.1007/s10924-014-0672-9
Keywords
Carboxymethyl chitosan; Chitosan; Plasticizer; Water vapor permeability; Oxygen permeability; Film
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Funding
- Isfahan University of Technology
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Transparent films of chitosan (CH), carboxymethyl chitosan (CMCH), and their blends were prepared using water or acetic acid as solvent and glycerol as plasticizer. Scanning electron microscopy micrographs of cross-section of the films indicated a multilayer structure for CH film and a compact and continuous one for CMCH film. In both solvent systems, increasing of concentration of plasticizer resulted in decreasing of tensile strength (TS) and increasing of elongation at break (% epsilon (b) ) of CMCH films. Moreover, CMCH films exhibited water vapor and oxygen barrier properties in the range of the values accepted for food packaging films (0.59-0.89 x 10(-14) kg/s m Pa and 0.8-3.1 x 10(-3) ccO(2)/m day atm). Although the barrier properties of CMCH films were comparable with that of CH films, CH film had significantly higher TS and % epsilon (b) . Blending of CMCH with CH (75 and 25 %, respectively) significantly enhanced the TS and % epsilon (b) of the obtained film compared to CMCH films (2.1 and 1.7 times, respectively). The water vapor and oxygen permeabilities (1.25 x 10(-14) kg/s m Pa and 3.4 x 10(-3) ccO(2)/m day atm, respectively) were still comparable with films of CH and CMCH.
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