Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7792757 | Carbohydrate Polymers | 2014 | 9 Pages |
Abstract
Novel hydrogels were prepared from hemicelluloses, polyvinyl alcohol (PVA), and chitin nanowhiskers through 0, 1, 3, 5, 7, and 9 times of freeze/thaw cycle. These hydrogels were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), X-ray diffraction (XRD), thermo-gravimetric analysis (TGA), swelling property, and compressive strength. The repeated freeze/thaw cycles induced physically crosslinked chains packing among these polymers, and a phase separation caused by the hydrogen bonds. Larger pores led to a high swelling degree, whereas the formation of compact structure after multiple freeze/thaw cycles resulted in high mechanical strength and thermal stability. The highest compressive strength of these hydrogels was achieved by the 9 times of freeze/thaw cycles with compressive stress of 10.5Â MPa. This work provides a remarkable way for the preparation of hydrogels with good mechanical properties by physical method.
Related Topics
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Authors
Ying Guan, Jing Bian, Feng Peng, Xue-Ming Zhang, Run-Cang Sun,