Journal
CARBOHYDRATE POLYMERS
Volume 96, Issue 2, Pages 602-610Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2012.10.064
Keywords
Corn starch film; Starch nanoparticles; Frequency sweep; Creep-recovery behavior; Time-temperature superposition (TTS)
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Funding
- 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]
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Starch films were successfully produced by incorporating spray dried and vacuum-freeze dried starch nanoparticles. The frequency sweep, creep-recovery behavior and time-temperature superposition (TTS) on these films were studied. All these films exhibited dominant elastic behavior (than viscous behavior) over the entire frequency range (0.1-100 rad/s). The incorporation of both types of starch nanoparticles increased the storage and loss modulus, tan delta, creep strain, creep compliance and creep rate at long time frame and reduced the recovery rate of films while the effect of different kinds of starch nanoparticles on these parameters was similar both in magnitude and trend. TTS method was successfully used to predict long time (over 20 days) creep behavior through the master curves. The addition of these nanoparticles could increase the activation energy parameter used in ITS master curves. Power law and Burger's models were capable of fitting storage and loss modulus (R-2 > 0.79) and creep data (R-2 > 0.96), respectively. (C) 2012 Elsevier Ltd. All rights reserved.
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