Starch films are very hygroscopic and undergo crystallization during processing and storage. In this work,
fatty acids (SA, PA and OA) were incorporated into starch films containing glycerol as plasticizer, in order
to reduce the hygroscopic character of the films and to improve water vapour permeability. Microstructural,
mechanical, barrier and optical properties were studied in both non-stored films and those
stored for 5 weeks. Fatty acid addition affected the main properties of films since mechanical resistance
was decreased, water vapour permeability was reduced and gloss and transparency were reduced. The
degree of starch and FA crystallinity increased with storage time and gave rise to changes in film
properties: films became stiffer, less effective as water vapour barriers and less transparent and glossy.
Saturated fatty acids were more efficient at reducing WVP as compared to oleic acid, but these differences
decreased after storage due to the greater increase in crystallization of the former as it has been
observed by X-ray diffraction.
Starch films are very hygroscopic and undergo crystallization during processing and storage. In this work,
fatty acids (SA, PA and OA) were incorporated into starch films containing glycerol as plasticizer, in order
to reduce the hygroscopic character of the films and to improve water vapour permeability. Microstructural,
mechanical, barrier and optical properties were studied in both non-stored films and those
stored for 5 weeks. Fatty acid addition affected the main properties of films since mechanical resistance
was decreased, water vapour permeability was reduced and gloss and transparency were reduced. The
degree of starch and FA crystallinity increased with storage time and gave rise to changes in film
properties: films became stiffer, less effective as water vapour barriers and less transparent and glossy.
Saturated fatty acids were more efficient at reducing WVP as compared to oleic acid, but these differences
decreased after storage due to the greater increase in crystallization of the former as it has been
observed by X-ray diffraction.
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