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Effect of ethanol content on rheology of film-forming solutions and properties of zein/chitosan film
- Zhang, Liming, Liu, Zhanli, Han, Xiangbo, Sun, Yang, Wang, Xiangyou
- International journal of biological macromolecules 2019 v.134 pp. 807-814
- X-ray diffraction, acetic acid, carbon dioxide, chitosan, differential scanning calorimetry, endothermy, ethanol, hydrogen bonding, oxygen, rheological properties, rheology, temperature, tensile strength, thermal stability, thermogravimetry, water vapor, zein
- 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 (16.72MPa 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°C. The thermogravimetric (TGA) results indicated that ZC-3 film had excellent thermal stability.