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Viscoelastic behavior of maize kernel studied by dynamic mechanical analyzer.

Shao-Yang Sheng1, Li-Jun Wang2, Dong Li1

  • 1College of Engineering, National Energy R & D Center for Non-food Biomass, China Agricultural University, PO Box 50, 17 Qinghua Donglu, Beijing 100083, China.

Carbohydrate Polymers
|August 18, 2014
PubMed
Summary
This summary is machine-generated.

Maize kernel

Keywords:
CreepCrystalline patternMaize kernelMorphologyStress relaxationViscoelastic behavior

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Area of Science:

  • Agricultural Engineering
  • Materials Science
  • Food Science

Background:

  • Understanding the mechanical properties of maize kernels is crucial for optimizing post-harvest processes.
  • Moisture content significantly influences the viscoelastic behavior and thermal properties of agricultural products.

Purpose of the Study:

  • To investigate the creep recovery, stress relaxation, and temperature/frequency dependence of maize kernel mechanical properties.
  • To model the viscoelastic behavior of maize kernels using established mechanical models.
  • To determine the effect of moisture content on the glass transition temperature (Tg) and microstructure of maize kernels.

Main Methods:

  • Dynamic mechanical analysis (DMA) was employed to measure mechanical properties.
  • Creep and stress relaxation tests were conducted across a moisture content range of 11.9% to 25.9% (w/w).
  • The Burgers and Maxwell models were used to analyze creep and stress relaxation data, respectively. Structural analysis included X-ray diffraction and microscopy.

Main Results:

  • The 4-element Burgers model accurately described maize kernel creep behavior (R(2)>0.97).
  • The 5-element Maxwell model provided a better prediction of stress relaxation than the 3-element model.
  • Glass transition temperature (Tg) decreased from 114 °C at 11.9% moisture to 65 °C at 25.9% moisture.
  • Loss moduli and tangent showed highest dependence on frequency at 20.7% moisture content.
  • Maize kernel microstructure expanded with increasing moisture content, exhibiting an A-type crystalline pattern.

Conclusions:

  • Maize kernel's viscoelastic properties are highly dependent on moisture content.
  • Burgers and Maxwell models effectively characterize the mechanical response of maize kernels.
  • Moisture influences thermal transitions and structural integrity, impacting processing and storage.