Biodegradable films obtained from chitosan (CH) and methylcellulose (MC) can reduce environmental problems associated with
synthetic packagings. Biodegradable films still need a cost reduction to be economically profitable; the use of CH, a by-product obtained
from wastes of the fishing industry would be a good alternative. The objectives of the present work were to characterize physical,
mechanical and water vapor barrier properties and microstructure of films of CH, MC and their mixtures.
Solutions of 2% CH and 1% MC were mixed in different proportions. Films were obtained by casting. Film microstructure was
characterized by SEM, X-ray diffraction and FTIR spectroscopy. Water vapor permeabilities for CH and MC films were
6.6770.741011 and 7.5570.601011 g/smPa, respectively; composite film permeabilities did not differ significantly from these
values. CH films showed rigid characteristics (high elastic modulus and low elongation). Flexibility of composite films increased with
increasing MC content, the higher elongation and lower elastic modulus of composite films indicated the relevance of hydrocolloid
interactions.
Biodegradable films obtained from chitosan (CH) and methylcellulose (MC) can reduce environmental problems associated withsynthetic packagings. Biodegradable films still need a cost reduction to be economically profitable; the use of CH, a by-product obtainedfrom wastes of the fishing industry would be a good alternative. The objectives of the present work were to characterize physical,mechanical and water vapor barrier properties and microstructure of films of CH, MC and their mixtures.Solutions of 2% CH and 1% MC were mixed in different proportions. Films were obtained by casting. Film microstructure wascharacterized by SEM, X-ray diffraction and FTIR spectroscopy. Water vapor permeabilities for CH and MC films were6.6770.741011 and 7.5570.601011 g/smPa, respectively; composite film permeabilities did not differ significantly from thesevalues. CH films showed rigid characteristics (high elastic modulus and low elongation). Flexibility of composite films increased withincreasing MC content, the higher elongation and lower elastic modulus of composite films indicated the relevance of hydrocolloidinteractions.
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