期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 140, 期 -, 页码 775-781出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2019.08.185
关键词
Thermoplastic starch; Polyvinyl alcohol; Phase behavior; Miscibility; Dynamic mechanical analysis; X-ray diffractometry
资金
- Iran National Science Foundation (INSF) [96010131]
Thermoplastic starch (TPS) and polyvinyl alcohol (PVA) blends were prepared by extrusion method in the presence of water/glycerol and citric add, and their phase behavior was investigated. Results of scanning electron microscopy (SEM) and X-ray diffractometry (XRD) tests demonstrated the complete plasticization of starch during the melt mixing. PVA crystal phase was not formed in blends with less than 50 wt% PVA. Fourier-transform infrared spectroscopy (FTIR) and dynamic mechanical analysis (DMA) analysis revealed high compatibility between two phases, starch and PVA. Addition of PVA to TPS resulted in the reduction of the glass transition temperature and dynamic moduli and improvement of sample flexibility. However, at 10 wt% PVA, an anti-plasticization effect caused to increase the Tg and storage modulus of the blend. (C) 2019 Elsevier B.V. All rights reserved.
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