Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 134, Issue -, Pages 807-814Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijbiomac.2019.05.085
Keywords
Rheology; Ethanol; Film
Funding
- National Natural Science Foundation of China [31301570, 30871757]
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The paper focused on the role of ethanol on rheological properties of zein/chitosan film-forming solutions, thermo-mechanical and structural characterization of films. The steady rheological results indicated that the film-forming solutions showed non-Newtonian behavior, and ZC-3 solution (zein treated with 90% ethanol and chitosan dissolved with acetic acid) had higher flow index (0.882 +/- 0.003). Based on dynamic rheological analysis, ZC-3 solution showed the highest G' value and the crossover point at the lowest frequency, representing the strongest entanglement and hydrogen bonding. ZC-3 film showed the highest tensile strength and elongation at break (16.72 MPa and 76.80%). The film prepared from high ethanol content improved water vapor, oxygen and carbon dioxide barrier properties. The X-ray diffraction (XRD) demonstrated zein and chitosan had good compatibility. Differential scanning calorimetric (DSC) indicated that the endothermic peak temperature of ZC-3 film was 148.83 degrees C. The thermogravimetric (TGA) results indicated that ZC-3 film had excellent thermal stability. (C) 2019 Elsevier B.V. All rights reserved.
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