期刊
CARBOHYDRATE POLYMERS
卷 174, 期 -, 页码 253-261出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2017.06.069
关键词
Dynamic mechanical analysis; Fourier transform infrared spectroscopy; Physical properties; Statistical analysis; X-ray diffraction; Zeta potential
资金
- Thailand Research Fund (TRF) [RTA 5880009, DPG 5980004]
Glycerol, charge modifying agent (NaC1) and high-pressure homogenization were used to prepare chitosan film-forming solution prior to drying to improve mechanical properties of the resulting films. Zeta potential and viscosity of each film solution were measured, while mechanical properties viz. tensile strength and percent elongation of the films were assessed. X-ray diffraction analysis, Fourier transform infrared spectroscopy and dynamic mechanical analysis results of the films were obtained and used to explain the mechanical property data. Combined use of glycerol, NaC1 and homogenization led to increased zeta potential but decreased viscosity of the solution. Electrostatic repulsion led to extended chitosan chains and lower film crystallinity and glass transition temperature due to weaker hydrogen bonding and increased amide-I band interactions. A film with the best mechanical properties (tensile strength of 50 MPa and percent elongation of 47) was from the solution with 25% (w/w) glycerol, 15-mM NaC1 and homogenized at 10/5 MPa. (C) 2017 Elsevier Ltd. All rights reserved.
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