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Dynamic Viscoelastic Properties of Sweet Potato Studied by Dynamic Mechanical Analyzer
Carbohydrate Polymers (2010)
  • Qian Li, China Agricultural University
  • Dong Li, China Agricultural University
  • Li Jun Wang, China Agricultural University
  • Necati Ozkan, Middle East Technical University
  • Zhi Huai Mao, China Agricultural University

The relaxation, creep, temperature-dependence and frequency-dependence characteristics of sweet potato roots were evaluated using a dynamic mechanical analyzer (DMA). The sweet potato was cut into rectangular to meet the testing requirements and wrapped with sealing film or aluminum foil to prevent water loss. The temperature scanning tests were carried out at 2 degrees C/min and 10 degrees C/min in the temperature range of 30-100 degrees C, and the frequency sweep tests were conducted in a range of 50-0.1 Hz. The regression results suggested that 5-element Maxwell model described relaxation behavior better for consisting of two relaxation times; the creep behavior matched the Burgers model well, and changes in creep parameters were observed after each creep cycle. The temperature scanning tests revealed that starch gelatinization was only obtained when the temperature increased at 2 degrees C/min. A resonance frequency was detected both in 3-point bending and compression deforming clamps.

Publication Date
Winter February 11, 2010
Citation Information
Qian Li, Dong Li, Li Jun Wang, Necati Ozkan, et al.. "Dynamic Viscoelastic Properties of Sweet Potato Studied by Dynamic Mechanical Analyzer" Carbohydrate Polymers Vol. 79 Iss. 3 (2010)
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