期刊
CARBOHYDRATE POLYMERS
卷 96, 期 2, 页码 593-601出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2012.12.042
关键词
Corn starch film; Starch nanoparticles; Physical properties; Mechanical properties
资金
- National Natural Science Foundation of China [31000813]
- Chinese Universities Scientific Fund [2012QJ009]
- High Technology Research and Development Program of China [2011AA100802]
- Commonweal Guild Agricultural Scientific Research Program of China [201003077]
- Science and Technology Program of Beijing [D12110003112002]
We report, for the first time, the preparation method and characteristics of starch films incorporating spray dried and vacuum freeze dried starch nanoparticles. Physical properties of these films such as morphology, crystallinity, water vapor permeability (WVP), opacity, and glass transition temperature (T-g) and mechanical properties (strain versus temperature, strain versus stress, Young's modulus and toughness) were measured. Addition of both starch nanoparticles in starch films increased roughness of surface, lowered degree of crystallinity by 23.5%, WVP by 44% and T-g by 4.3 degrees C, respectively compared to those of starch-only films. Drying method used in preparation of starch nanoparticles only affected opacity of films. The incorporation of nanoparticles in starch films resulted into denser films due to which the extent of variation of strain with temperature was much lower. The toughness and Young's modulus of films containing both types of starch nanoparticles were lower than those of control films especially at <100 degrees C. (C) 2012 Elsevier Ltd. All rights reserved.
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